# Category Archives: QM Seminar

## QM Seminar speaker Laurens Vanderstraeten (Ghent University), Wednesday, June 12

Time/Venue: Wednesday, June 12 at 2:00 pm in LeConte 402Title: Simulating excitation spectra with projected entangled-pair statesAbstract: In this talk we show how to simulate the excitation spectrum for two-dimensional quantum spin systems using the formalism of tensor networks. We … Continue reading

## QM Seminar speaker Frank Schindler (University of Zurich), Wednesday, June 5

Time/Venue: Wednesday, June 5 at 2:00 pm in LeConte 402 Title: Topological zero-dimensional defect statesAbstract: Crystal defects in topological insulators (TIs) are known to bind anomalous electronic states with two fewer dimensions than the bulk; the most commonly cited examples are the … Continue reading

## Special QM Seminar Speaker Joaquin Rodriguez Nieva (Harvard) Thursday, May 23

Time: 11:00 amVenue: 325 LeConteTitle: Probing hydrodynamics and thermalization in quantum spin systemsAbstract: The presence of symmetries and conservation laws can have striking manifestations in the dynamic and thermalization behavior of interacting quantum systems. I will discuss two such manifestations arising in … Continue reading

## QM Seminar Speaker Constantin Schrade (MIT) Wednesday, May 15

Time: 2:00 pm, Wednesday, May 15Venue: LeConte 402 Title: New quantum materials and devices: From “Majorana Superconducting Qubits” to “Spin-valley density waves” in moiré materials. Abstract: The first part of this talk will introduce new devices for establishing a feasible … Continue reading

## Special QM Seminar Speaker Bjorn Sbierski (UCB) Monday, May 6

Time: 11:00 amVenue: LeConte 375Title: Non-perturbative approach to disorder (in nodal semimetals)Abstract: The self-consistent Born approximation quantitatively fails tocapture disorder effects in semimetals. We present an alternative, simple-to-use non-perturbative approach to calculate the disorder induced self-energy. It requires a sufficient broadening … Continue reading

## Special QM Seminar Speaker Congjun Wu (UCSD) Tuesday, April 30

Time: 3:00 pm, Tuesday, April 30Venue: CQCS (Ground floor/ 101 Campbell Hall)Title: Orbital-active honeycomb materialsAbstract: We provide a unified view for a class of orbital-active honeycomb materials, including bismuthene, stanene, exciton-polarition lattice, and the recent focus of the twisted bilayer graphene. … Continue reading

## Special QM Seminar Speaker Janos Asboth (Wigner Research Centre for Physics, Budapest, Hungary) Tuesday, April 30

Time: 11 amVenue: 375 LeConteTitle: Topological phases of quantum walks and how they can be detected using lossesAbstract: Topological insulators have Hamiltonians with bulk topological invariants, which control the interesting processes at the surface of the system, but are hard to measure … Continue reading

## QM Seminar Speaker Paul Fendley (Oxford) Wednesday, April 24

Time: 2:00 pm, Wednesday, April 24Venue: Old LeConte 402Title: Supersymmetry and free fermions from interacting Majorana fermions Abstract: Perturbing a quantum spin/Majorana chain with a self-dual four-fermi terms leads to tricritical Ising point separating a critical phase from a gapped phase with … Continue reading

## Chern-Simons Lectures: Jean-Bernard Zuber (Laboratoire de Physique Théorique et Hautes Energies, Sorbonne Université, Paris) Tuesday, April 2-Thursday, April 4

Lecture 1. Counting curves and knots and linksTuesday April 2, 11:00-12.30 am, Le Conte 402 This talk will be devoted to the problem of counting curves, knots and links, a classical mathematical problem in which physics may bring new ideas … Continue reading

## QM Seminar Speaker Antti Niemi (Nordita) Thursday, March 28

Time: Thursday, March 28, 11:00 amVenue: LeConte 325Title: Hamiltonian time crystalsAbstract: Time crystal is presumed to be a state of matter that cannot be isolated from its environment. A time crystal is supposed to be an open, non-equilibrium system. In … Continue reading