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BEGIN:VEVENT
SUMMARY:Anomalies and symmetric mass generation for staggered fermions –
Talk 1
DTSTART;VALUE=DATE-TIME:20220520T130000Z
DTEND;VALUE=DATE-TIME:20220520T134500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-186@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Simon Catterall (Syracuse University)\nhttps://event
s.perimeterinstitute.ca/event/11/contributions/186/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/186/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome and Opening Remarks
DTSTART;VALUE=DATE-TIME:20220516T130000Z
DTEND;VALUE=DATE-TIME:20220516T131500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-164@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Emilie Huffman (Perimeter Institute)\, Ribhu Kaul (U
niversity of Kentucky)\, Roger Melko (Perimeter Institute & University of
Waterloo)\, Shailesh Chandrasekharan (Duke University)\nhttps://events.per
imeterinstitute.ca/event/11/contributions/164/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/164/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Blackboard Talk 1 - Virtual
DTSTART;VALUE=DATE-TIME:20220516T131500Z
DTEND;VALUE=DATE-TIME:20220516T140000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-165@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Senthil Todadri (Massachusetts Institute of Technolo
gy)\nhttps://events.perimeterinstitute.ca/event/11/contributions/165/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/165/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Blackboard Talk 2 - Virtual
DTSTART;VALUE=DATE-TIME:20220516T143000Z
DTEND;VALUE=DATE-TIME:20220516T151500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-166@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Senthil Todadri (Massachusetts Institute of Technolo
gy)\nhttps://events.perimeterinstitute.ca/event/11/contributions/166/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/166/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk
DTSTART;VALUE=DATE-TIME:20220516T180000Z
DTEND;VALUE=DATE-TIME:20220516T184500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-167@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Fakher Assaad (University of Wuerzburg)\nhttps://eve
nts.perimeterinstitute.ca/event/11/contributions/167/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/167/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum electrodynamics with massless fermions in three dimensions
- Talk 1
DTSTART;VALUE=DATE-TIME:20220517T130000Z
DTEND;VALUE=DATE-TIME:20220517T134500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-170@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Rajamani Narayanan (Florida International University
)\nhttps://events.perimeterinstitute.ca/event/11/contributions/170/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/170/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum electrodynamics with massless fermions in three dimensions
- Talk 2
DTSTART;VALUE=DATE-TIME:20220517T141500Z
DTEND;VALUE=DATE-TIME:20220517T150000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-171@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Rajamani Narayanan (Florida International University
)\nhttps://events.perimeterinstitute.ca/event/11/contributions/171/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/171/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Sport and a Pastime: Model design and computation for quantum cr
iticality\, gauge fields and matter
DTSTART;VALUE=DATE-TIME:20220518T130000Z
DTEND;VALUE=DATE-TIME:20220518T134500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-174@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Zi Yang Meng (University of Hong Kong)\nhttps://eve
nts.perimeterinstitute.ca/event/11/contributions/174/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/174/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum steampunk: Quantum information meets thermodynamics
DTSTART;VALUE=DATE-TIME:20220518T180000Z
DTEND;VALUE=DATE-TIME:20220518T190000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-177@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Nicole Yunger Halpern (University of Maryland)\nTher
modynamics has shed light on engines\, efficiency\, and time’s arrow sin
ce the Industrial Revolution. But the steam engines that powered the Indus
trial Revolution were large and classical. Much of today’s technology an
d experiments are small-scale\, quantum\, far from equilibrium\, and proce
ssing information. Nineteenth-century thermodynamics needs re-envisioning
for the 21st century. Guidance has come from the mathematical toolkit of q
uantum information theory. Applying quantum information theory to thermody
namics sheds light on fundamental questions (e.g.\, how does entanglement
spread during quantum thermalization? How can we distinguish quantum heat
from quantum work?) and practicalities (e.g.\, quantum engines and the the
rmodynamic value of coherences). I will overview how quantum information t
heory is being used to revolutionize thermodynamics in quantum steampunk\,
named for the steampunk genre of literature\, art\, and cinema that juxta
poses futuristic technologies with 19th-century settings.\n\nhttps://event
s.perimeterinstitute.ca/event/11/contributions/177/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/177/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergibility: from lattice spins to critical gauge theories and be
yond - Talk 1
DTSTART;VALUE=DATE-TIME:20220519T130000Z
DTEND;VALUE=DATE-TIME:20220519T134500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-181@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Chong Wang (Perimeter Institute)\nhttps://events.per
imeterinstitute.ca/event/11/contributions/181/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/181/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergibility: from lattice spins to critical gauge theories and be
yond - Talk 2
DTSTART;VALUE=DATE-TIME:20220519T141500Z
DTEND;VALUE=DATE-TIME:20220519T150000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-182@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Chong Wang (Perimeter Institute)\nhttps://events.per
imeterinstitute.ca/event/11/contributions/182/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/182/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractionalized fermionic quantum criticality
DTSTART;VALUE=DATE-TIME:20220519T201500Z
DTEND;VALUE=DATE-TIME:20220519T210000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-185@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Lukas Janssen (Technical University Dresden)\nIn fru
strated magnets\, novel phases characterized by fractionalized excitations
and emergent gauge fields can occur. A paradigmatic example is given by t
he Kitaev model of localized spins 1/2 on the honeycomb lattice\, which re
alizes an exactly solvable quantum spin liquid ground state with Majorana
fermions as low-energy excitations. I will demonstrate that the Kitaev sol
ution can be generalized to systems with spin and orbital degrees of freed
om. The phase diagrams of these Kitaev-Kugel-Khomskii spin-orbital magnets
feature a variety of novel phases\, including different types of quantum
liquids\, as well as conventional and unconventional long-range-ordered ph
ases\, and interesting phase transitions in between. In particular\, I wil
l discuss the example of a continuous quantum phase transition between a K
itaev spin-orbital liquid and a symmetry-broken phase. This transition can
be understood as a realization of a fractionalized fermionic quantum crit
ical point.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions
/185/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/185/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalies and symmetric mass generation for staggered fermions –
Talk 2
DTSTART;VALUE=DATE-TIME:20220520T141500Z
DTEND;VALUE=DATE-TIME:20220520T150000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-187@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Simon Catterall (Syracuse University)\nhttps://event
s.perimeterinstitute.ca/event/11/contributions/187/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/187/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Deconfined quantum critical points with emergent SO(5) symmetry in
fermionic models
DTSTART;VALUE=DATE-TIME:20220520T151500Z
DTEND;VALUE=DATE-TIME:20220520T160000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-188@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Hong Yao (Tsinghua University)\nhttps://events.perim
eterinstitute.ca/event/11/contributions/188/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/188/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thank you and Good-Bye
DTSTART;VALUE=DATE-TIME:20220520T183000Z
DTEND;VALUE=DATE-TIME:20220520T183500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-190@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Emilie Huffman (Perimeter Institute)\, Ribhu Kaul (U
niversity of Kentucky)\, Roger Melko (Perimeter Institute & University of
Waterloo)\, Shailesh Chandrasekharan (Duke University)\nhttps://events.per
imeterinstitute.ca/event/11/contributions/190/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/190/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Data-enhanced variational Monte Carlo for Rydberg atom arrays
DTSTART;VALUE=DATE-TIME:20220518T213000Z
DTEND;VALUE=DATE-TIME:20220518T215000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-191@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Stefanie Czischek (Perimeter Institute & University
of Waterloo)\nRydberg atom arrays are programmable quantum simulators capa
ble of preparing interacting qubit systems in a variety of quantum states.
However\, long experimental state preparation times limit the amount of m
easurement data that can be generated at reasonable timescales\, posing a
challenge for the reconstruction and characterization of quantum states. O
ver the last years\, neural networks have been explored as a powerful and
systematically tuneable ansatz to represent quantum wavefunctions. These m
odels can be efficiently trained from projective measurement data or throu
gh Hamiltonian-guided variational Monte Carlo. In this talk\, I will compa
re the data-driven and Hamiltonian-driven training procedures to reconstru
ct ground states of two-dimensional Rydberg atom arrays. I will discuss th
e limitations of both approaches and demonstrate how pretraining on a smal
l amount of measurement data can significantly reduce the convergence time
for a subsequent variational optimization of the wavefunction.\n\nhttps:/
/events.perimeterinstitute.ca/event/11/contributions/191/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/191/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bootstrapping critical gauge theories
DTSTART;VALUE=DATE-TIME:20220519T191500Z
DTEND;VALUE=DATE-TIME:20220519T200000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-184@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Yin-Chen He (Perimeter Institute)\nI will talk about
our recent progress on bootstrapping critical gauge theories. In specific
\, I will first introduce the current understanding that why bootstrap wor
ks\, for example\, why a CFT can sit at a kink of bootstrap bounds and why
CFT can be isolated as an island. Then\, I will apply these idea to a pro
totypical critical gauge theory--the scalar QED (i.e. SU(N) deconfined pha
se transition)\, and demonstrate it can be isolated in a bootstrap island
when the matter flavour is large.\n\nhttps://events.perimeterinstitute.ca/
event/11/contributions/184/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/184/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Deconfined multi-criticality in quantum spin models and experiment
s
DTSTART;VALUE=DATE-TIME:20220517T191500Z
DTEND;VALUE=DATE-TIME:20220517T200000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-173@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Anders Sandvik (Boston University)\nIn the original
field theoretical scenario of deconfined quantum criticality\, the deconfi
ned quantum-critical point (DQCP) separating antiferromagnetic (AFM) and s
inglet-solid phases of quantum magnets is generic\, i.e.\, does not requir
e fine-tuning. Recent numerical studies instead point to a fine-tuned mult
i-critical DQCP [1] that is also the end-point of a gapless spin liquid ph
ase [2]. An example is the Shastry-Sutherland (SS) model\, where a narrow
spin liquid phase was recently detected [2\,3]\, instead of the previously
argued direct transition between plaquette singlet solid (PSS) and AFM ph
ases. The multi-critical DQCP\, followed by a direct transition without in
tervening spin liquid\, can be reached when other interactions are include
d. Very recent NMR experiments on the SS compound SrCu2(BO3)2 under high p
ressures and high magnetic fields are consistent with this scenario [4]. L
ow-temperature (below 0.1 K) direct PSS to XY-AFM transitions were observe
d that become less strongly first-order at higher pressures. At the highes
t pressure\, quantum-critical scaling of the spin-lattice relaxation was o
bserved\, indicating close proximity to a DQCP. This point may be the end-
point of a not yet confirmed quantum spin liquid phase existing at slightl
y higher pressures.\n\n[1] B. Zhao\, J. Takahashi\, and A. W. Sandvik\, PR
L 125\, 257204 (2020).\n[2] J. Yang\, A. W. Sandvik\, and L. Wang\, PRB 10
5\, L060409 (2022).\n[3] L. Wang\, Y. Zhang\, and A. W. Sandvik\, arXiv:22
05.02476\n[4] Y. Cui et al.\, arXiv:2204.08133.\n\nhttps://events.perimete
rinstitute.ca/event/11/contributions/173/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/173/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Self dual U(1) lattice field theory with a theta-term
DTSTART;VALUE=DATE-TIME:20220516T201500Z
DTEND;VALUE=DATE-TIME:20220516T210000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-169@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Christoff Gattringer (Austrian Science Fund)\nStarti
ng from the Villain formulation with an additional constraint we construct
a self-dual lattice version of U(1) field theory with a theta-term. An in
teresting feature is that the self-dual symmetry gives rise to an action t
hat is local but not ultra-local\, similar to lattice actions that impleme
nt chiral symmetry. We outline how electric and magnetic matter can be cou
pled in a self-dual way and discuss the emerging symmetry structure with t
he theta term. We present results from a Monte Carlo simulation of the sel
f-dual system with electric and magnetic matter and explore spontaneous br
eaking of the self-dual symmetry.\n\nhttps://events.perimeterinstitute.ca/
event/11/contributions/169/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/169/
END:VEVENT
BEGIN:VEVENT
SUMMARY:(Multi-)Critical Point\, and Potential Realization with infinite F
ractal Symmetries
DTSTART;VALUE=DATE-TIME:20220520T170000Z
DTEND;VALUE=DATE-TIME:20220520T174500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-189@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Cenke Xu (University of California\, Santa Barbara)\
nIn the last few years the concept of symmetry has been significantly expa
nded. One exotic example of the generalized symmetries\, is the “type-II
subsystem symmetry”\, where the conserved charge is defined on a fracta
l sublattice of an ordinary lattice. In this talk we will discuss examples
of models with the fractal symmetries. In particular\, we will introduce
a quantum many-body model with a “Pascal’s triangle symmetry”\, whic
h is an infinite series of fractal symmetries\, including the better known
Sierpinski-triangle fractal symmetry. We will also construct a gapless mu
lticritical point with the Pascal’s triangle symmetry\, where the genera
tor of all the fractal symmetries decay with a power-law. If time permits\
, we will also mention a few potential experimental realizations for model
s with fractal symmetries.\n\nhttps://events.perimeterinstitute.ca/event/1
1/contributions/189/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/189/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multiband superconductivity and the breaking of time reversal symm
etry
DTSTART;VALUE=DATE-TIME:20220519T180000Z
DTEND;VALUE=DATE-TIME:20220519T184500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-183@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Igor Herbut (Simon Fraser University)\nI will discus
s how spontaneous breaking of time reversal symmetry in multiband supercon
ductors leads quite generally to the formation of small Fermi surfaces of
Bogoliubov excitations\, irrespective of whether inversion symmetry is abs
ent or present in the superconducting state. In the latter case the invers
ion symmetry is susceptible to being dynamical broken at low temperatures
by the residual interactions. A lattice model of this process will be dis
cussed. Its final result is a reduced\, but still finite Bogoliubov-Fermi
surface.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/1
83/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/183/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dirac criticality from field theory beyond the leading order
DTSTART;VALUE=DATE-TIME:20220518T141500Z
DTEND;VALUE=DATE-TIME:20220518T150000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-175@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Michael Scherer (Ruhr University Bochum )\nTwo-dimen
sional gapless Dirac fermions emerge in various condensed-matter settings.
In the presence of interactions such Dirac systems feature critical point
s and the precision determination of their exponents is a prime challenge
for quantum many-body methods. In a field-theoretical language\, these cri
tical points can be described by Gross-Neveu-Yukawa-type models and in my
talk I will show some results on Gross-Neveu critical behavior using field
theoretical approaches beyond the leading order. To that end\, I will fir
st present higher-loop perturbative RG calculations for generic Gross-Neve
u-Yukawa models and compare estimates for the exponents with recent corres
ponding results from Quantum Monte Carlo simulations and the conformal boo
tstrap. Then\, I will discuss a more exotic variant of Gross-Neveu-Yukawa
models which describes the interacting fractionalized excitations of two-d
imensional frustrated spin-orbital magnets. Here\, we have provided field-
theoretical estimates for the critical exponents employing higher-order ep
silon expansion\, large-N calculations\, and functional renormalization gr
oup.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/175/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/175/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing sign structure using measurement-induced entanglement
DTSTART;VALUE=DATE-TIME:20220518T151500Z
DTEND;VALUE=DATE-TIME:20220518T160000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-176@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Tim Hsieh (Perimeter Institute)\nThe sign structure
of quantum states is closely connected to quantum phases of matter\, yet d
etecting such fine-grained properties of amplitudes is subtle. We employ
as a diagnostic measurement-induced entanglement (MIE)-- the average entan
glement generated between two parties after measuring the rest of the syst
em. We propose that for a sign-free state\, the MIE upon measuring in the
sign-free basis decays no slower than correlations in the state before me
asurement. Concretely\, we prove that MIE is upper bounded by mutual info
rmation for sign-free stabilizer states (essentially CSS codes)\, which es
tablishes a bound between scaling dimensions of conformal field theories d
escribing measurement-induced critical points in stabilizer systems. We a
lso show that for sign-free qubit wavefunctions\, MIE between two qubits i
s upper bounded by a simple two-point correlation function\, and we verify
our proposal in several critical ground states of one-dimensional systems
\, including the transverse field and tri-critical Ising models. In contr
ast\, for states with sign structure\, such bounds can be violated\, as we
illustrate in critical hybrid circuits involving both Haar or Clifford ra
ndom unitaries and measurements\, and gapless symmetry-protected topologic
al states.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/
176/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/176/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Superconductivity\, charge density wave\, and supersolidity in fla
t bands with tunable quantum metric
DTSTART;VALUE=DATE-TIME:20220518T193000Z
DTEND;VALUE=DATE-TIME:20220518T201500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-178@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Johannes Hofmann (Weizmann Institute of Science)\nPr
edicting the fate of an interacting system in the limit where the electron
ic bandwidth is quenched is often highly non-trivial. The complex interpla
y between interactions and quantum fluctuations driven by the band geometr
y can drive a competition between various ground states\, such as charge d
ensity wave order and superconductivity. In this work\, we study an electr
onic model of topologically-trivial flat bands with a continuously tunable
Fubini-Study metric in the presence of on-site attraction and nearest-nei
ghbor repulsion\, using numerically exact quantum Monte Carlo simulations.
By varying the electron filling and the spatial extent of the localized f
lat-band Wannier wavefunctions\, we obtain a number of intertwined orders.
These include a phase with coexisting charge density wave order and super
conductivity\, i.e.\, a supersolid. In spite of the non-perturbative natur
e of the problem\, we identify an analytically tractable limit associated
with a `small' spatial extent of the Wannier functions\, and derive a low-
energy effective Hamiltonian that can well describe our numerical results.
\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/178/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/178/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New topological phases in the Kitaev model as a function of magnet
ic field
DTSTART;VALUE=DATE-TIME:20220517T180000Z
DTEND;VALUE=DATE-TIME:20220517T184500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-172@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Nandini Trivedi (Ohio State University)\n"The Kitaev
model with anisotropic interactions on the bonds of a honeycomb lattice i
s a paradigmatic model for quantum spin liquids. Despite the simplicity of
the model\, a rich phase diagram with gapless and gapped quantum spin liq
uid phases\, with abelian and non-abelian excitations\, are revealed as a
function of a magnetic field and bond couplings. Our results of the entang
lement entropy\, topological entanglement entropy\, and the dynamical spin
excitation spectrum\, are obtained using exact diagonalization and densit
y matrix renormalization group (DMRG) methods. We provide insights into t
he phases from the underlying effective field theories. \n\nIn collaborat
ion with Shi Feng\, Cullen Gantenberg\, Adhip Agarwala\, Subhro Bhattachar
jee \n\n[1] Signatures of magnetic-field-driven quantum phase transitions
in the entanglement entropy and spin dynamics of the Kitaev honeycomb mode
l\, David C. Ronquillo\, Adu Vengal\, Nandini Trivedi\, Phys. Rev. B 99\,
140413 (2019) \n\n[2] Magnetic field induced intermediate quantum spin-liq
uid with a spinon Fermi surface\, Niravkumar D. Patel and Nandini Trivedi\
, Proceedings of the National Academy of Sciences 116\, 12199 (2019). \n\n
[3] Two-Magnon Bound States in the Kitaev Model in a [111]-Field\, Subhasr
ee Pradhan\, Niravkumar D. Patel\, Nandini Trivedi\, Phys. Rev. B 101\, 18
0401 (2020) \n\n[4] Symmetry Analysis of Tensors in the Honeycomb Lattice
of Edge-Sharing Octahedra\, Franz G. Utermohlen\, Nandini Trivedi\, Phys.
Rev. B 103\, 155124 (2021) "\n\nhttps://events.perimeterinstitute.ca/event
/11/contributions/172/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/172/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neural annealing and visualization of autoregressive neural networ
ks
DTSTART;VALUE=DATE-TIME:20220518T203000Z
DTEND;VALUE=DATE-TIME:20220518T211500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-179@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Estelle Inack (Perimeter Institute)\nArtificial neur
al networks have been widely adopted as ansatzes to study classical and qu
antum systems. However\, some notably hard systems such as those exhibitin
g glassiness and frustration have mainly achieved unsatisfactory results d
espite their representational power and entanglement content\, thus\, sugg
esting a potential conservation of computational complexity in the learnin
g process. We explore this possibility by implementing the neural annealin
g method with autoregressive neural networks on a model that exhibits glas
sy and fractal dynamics: the two-dimensional Newman-Moore model on a trian
gular lattice. We find that the annealing dynamics is globally unstable be
cause of highly chaotic loss landscapes. Furthermore\, even when the corre
ct ground state energy is found\, the neural network generally cannot find
degenerate ground-state configurations due to mode collapse. These findin
gs indicate that the glassy dynamics exhibited by the Newman-Moore model c
aused by the presence of fracton excitations in the configurational space
likely manifests itself through trainability issues and mode collapse in t
he optimization landscape.\n\nhttps://events.perimeterinstitute.ca/event/1
1/contributions/179/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/179/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reducing the Sign Problem with Complex Neural Networks
DTSTART;VALUE=DATE-TIME:20220516T190000Z
DTEND;VALUE=DATE-TIME:20220516T194500Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-168@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Johann Ostmeyer (University of Liverpool)\nThe sign
problem is arguably the greatest weakness of the otherwise highly efficien
t\, non-perturbative Monte Carlo simulations. Recently\, considerable prog
ress has been made in alleviating the sign problem by deforming the integr
ation contour of the path integral into the complex plane and applying mac
hine learning to find near-optimal alternative contours. This deformation
however requires a Jacobian determinant calculation which has a generic co
mputational cost scaling as volume cubed. In this talk I am going to prese
nt a new architecture with linear runtime\, based on complex-valued affine
coupling layers.\n\nhttps://events.perimeterinstitute.ca/event/11/contrib
utions/168/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/168/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Criticality in the 2+1d Thirring Model
DTSTART;VALUE=DATE-TIME:20220520T174500Z
DTEND;VALUE=DATE-TIME:20220520T183000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-195@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Simon Hands (University of Liverpool)\n"The Thirring
Model is a covariant quantum field theory of interacting fermions\, shari
ng many features in common with effective theories of two-dimensional elec
tronic systems with linear dispersion such as graphene.\n\nFor a small num
ber of flavors and sufficiently strong interactions the ground state may b
e disrupted by condensation of particle- hole pairs leading to a quantum c
ritical point. With no small dimensionless parameters in play in this regi
me the Thirring model is plausibly the simplest theory of fermions requiri
ng a numerical solution.\n\nI will review what is currently known focussin
g on recent results and challenges from simulations employing Domain Wall
Fermions\, a formulation drawn from state-of-the-art lattice QCD\, to fait
hfully capture the underlying symmetries at the critical point."\n\nhttps:
//events.perimeterinstitute.ca/event/11/contributions/195/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/195/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A minimalist's approach to the physics of emergence
DTSTART;VALUE=DATE-TIME:20220518T215000Z
DTEND;VALUE=DATE-TIME:20220518T221000Z
DTSTAMP;VALUE=DATE-TIME:20221202T124117Z
UID:indico-contribution-11-196@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Liujun Zou (Perimeter Institute)\nOne of the central
themes of quantum many-body physics and quantum field theory is the emerg
ence of universality classes. In general\, determining which universality
class emerges in a quantum many-body system is a highly complex problem. I
will argue that the perspective of quantum anomaly provides powerful insi
ghts to the understanding of the landscape of universality classes that ca
n emerge in a quantum matter\, and I will present some interesting applica
tions.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/196/
LOCATION:
URL:https://events.perimeterinstitute.ca/event/11/contributions/196/
END:VEVENT
END:VCALENDAR