Quantum Matter Workshop

Contribution List

1. Welcome and Opening Remarks

Marcel Franz (University of British Columbia ), Tim Hsieh (Perimeter Institute), Yong-Baek Kim (University of Toronto)

11/14/22, 9:20 AM

18. Equity, Diversity and Inclusion at Perimeter

Ana Sofia Barrows (Perimeter Institute)

11/14/22, 9:25 AM

3. Topological superconductivity in twisted double-layer high-Tc cuprates: Theory and experimental signatures

Marcel Franz (University of British Columbia)

11/14/22, 9:30 AM

Structures composed of two monolayer-thin d-wave superconductors with a twist angle close to 45° are predicted to form a robust, fully gapped topological superconducting phase with spontaneously broken time-reversal symmetry and protected chiral edge modes. In this talk I will briefly review the theory behind the topological phase and discuss recent experimental efforts to fabricate and probe...

4. Stacking Induced Spontaneous Polarization in Rhombohedral MoS2

Ziliang Ye (University of British Columbia)

11/14/22, 10:15 AM

"The relatively weak van der Waals bond in 2D materials has ushered in a rich new era of stacking engineering. We recently found in rhombohedrally stacked MoS2, a Berry phase contrast between layers can induce an asymmetric interlayer coupling and an out-of-plane spontaneous electrical polarization (1). The polarization direction can be switched via interlayer sliding, forming a new type of...

16. Recurrent neural networks for many-body physics

Juan Felipe Carrasquilla Álvarez (University of Toronto & Vector Institute)

11/14/22, 11:30 AM

I will discuss our recent work on the use of autoregressive neural networks for many-body physics. In particular, I will discuss two approaches to represent quantum states using these models and their applications to the reconstruction of quantum states, the simulation of real-time dynamics of open quantum systems, and the approximation of ground states of many-body systems displaying...

6. Z2 spin liquids in spin-S Kitaev honeycomb model via parton construction

Han Ma (Perimeter Institute)

11/14/22, 2:00 PM

Unlike the half spin Kitaev honeycomb model which can be solved by an exact parton construction, the higher spin analogue of it is not solvable and it is still controversial if it exhibits a quantum spin liquid phase. In this talk, I will present a generalized parton construction where each spin-S is represented by 8S Majorana fermions. This framework naturally leads to a Z2 spin liquid when S...

7. Poster Previews

11/14/22, 3:15 PM

3:15PM Arnab Adhikary
3:18PM Anjishnu Bose
3:21PM Matthew Duschenes
3:24PM SangEun Han & Daniel Schultz
3:27PM Andrew Hardy
3:30PM Daniel Huerga
3:33PM Vedangi Pathak
3:36PM Shengqi Sang
3:39PM Joseph Tindall
3:42PM Tarun Tummuru
3:45PM Ryohei Weil
3:48PM Rui Wen
3:51PM Ye Weicheng
3:54PM Emily Zhang

8. Non-Fermi liquids and quantum criticality in multipolar Kondo systems

Yong-Baek Kim (University of Toronto)

11/15/22, 9:30 AM

We discuss emergent non-Fermi liquid behaviors in multipolar Kondo systems, where conduction electrons interact with the non-Kramers local moments carrying higher-rank multipolar moments such as quadrupolar and octupolar moments. We first show that unexpected non-Fermi liquid states arise in the single impurity multipolar Kondo system using the renormalization group and conformal field theory....

9. Functional renormalization group formalism for non-Fermi liquids and the antiferromagnetic quantum critical metal

Sung-Sik Lee (Perimeter Institute & McMaster University)

11/15/22, 10:15 AM

We develop a field-theoretic functional renormalization group formalism for field theories of metals that include all gapless modes around the Fermi surface. Due to the presence of intrinsic scales (Fermi momenta), the usual notion of scale invariance and renormalizable field theory need to be generalized. The formalism is applied to the non-Fermi liquid that arises at the anti-ferromagnetic...

11. Synthesis of many-body quantum states using group-IV (Ge/Si) quantum devices

Joe Salfi (University of British Columbia)

11/15/22, 11:30 AM

Quantum dot arrays are an emerging system to synthesize controlled many-body quantum states for quantum simulation and computation. When cooled to a low temperature, each quantum dot acts as a site on which the number of half-integer spin particles can be controlled using voltages applied to gates, not unlike the gates on classical transistors. Moreover, the spin can be controlled and measured...

12. A minimalist's approach to the physics of emergence

Liujun Zou (Perimeter Institute)

11/15/22, 2:00 PM

One of the central themes of condensed matter physics is the emergence of universality classes. In general, it is highly complex to determine which universality class emerges in a quantum matter based on its microscopic properties. In this talk, I will argue that the perspective of quantum anomaly provides powerful insights into the understanding of the landscape of universality classes that...

13. Measurement as a shortcut to long-range entangled quantum matter

Tsung-Cheng Lu (Perimeter Institute)

11/15/22, 3:15 PM

The preparation of long-range entangled states using unitary circuits is limited by Lieb-Robinson bounds, but circuits with projective measurements and feedback (``adaptive circuits'') can evade such restrictions. We introduce three classes of local adaptive circuits that enable low-depth preparation of long-range entangled quantum matter characterized by gapped topological orders and...

14. Emergent anomalies and generalized Luttinger theorems in metals and semimetals

Anton Burkov (Perimeter Institute)

11/16/22, 9:30 AM

Luttinger's theorem connects a basic microscopic property of a given metallic crystalline material, the number of electrons per unit cell, to the volume, enclosed by its Fermi surface, which defines its low-energy observable properties. Such statements are valuable since, in general, deducing a low-energy description from microscopics, which may perhaps be regarded as the main problem of...

15. Intrinsically gapless symmetry-protected topology

Andrew Potter (University of British Columbia)

11/16/22, 10:15 AM

While sharply-quantized topological features are conventionally associated with gapped phases of matter, there are a growing number of examples of gapless systems with topologically protected edge states. A particularly striking set of examples are "intrinsically gapless" symmetry-protected topological states (igSPTs), which host topological surface states that could not arise in a gapped...

5. Common features in spin-orbit excitations of Kitaev materials

Young-June Kim (University of Toronto)

11/16/22, 11:30 AM

"Magnetic materials with 4d or 5d transition metals have drawn much attention for their unique magnetic properties arising from J_eff=1/2 magnetic states. Among them, a honeycomb lattice material with unusual bond-dependent interactions called Kitaev interactions is of particular interest due to the potential for realizing the Kitaev quantum spin liquid state. Although much progress has been...

17. Unlocking the Universe with quantum materials

Jess McIver (University of British Columbia)

11/16/22, 2:00 PM

Just seven years after their first detection, gravitational waves (GWs) have revealed the first glimpses of a previously hidden dark Universe. Using the GW signature of distant compact-object collisions, we have discovered a new population of stellar remnants and unlocked new tests of general relativity, cosmology, and ultra-dense matter. Materials with low mechanical loss (and strong...

10. Non-Fermi liquids and quantum criticality in multipolar Kondo systems

Yong-Baek Kim (University of Toronto)

We discuss emergent non-Fermi liquid behaviors in multipolar Kondo systems, where conduction electrons interact with the non-Kramers local moments carrying higher-rank multipolar moments such as quadrupolar and octupolar moments. We first show that unexpected non-Fermi liquid states arise in the single impurity multipolar Kondo system using the renormalization group and conformal field theory....