Hong Kong Computational and Theoretical Physics Study Group 2023

March 14, 2023 | 4:30pm

• This lecture will be designed to introduce these forefront topics in current physics research to a general audience.

March 14, 2023 | 5:30pm

• Professor Subir Sachdev will use the parton method to describe the simplest spin liquids on the square lattice: those with emergent Z2, U(1), and SU(2) gauge fields and he will also discuss confinement transitions of these spin liquids.

March 15, 2023 | 4:30pm

• Professor Subir Sachdev will begin with an introduction to the phase diagram of the hole-doped cuprates.

March 16, 2023 | 4:30pm

• Professor Subir Sachdev and his team present a theory of strange metals in two dimensions which reproduces all of these features, and is also in general agreement with the frequency and T dependence of optical conductivity measurements in the hole-doped cuprates. The theory describes a Fermi surface coupled to a critical boson, the latter representing an order parameter or an emergent gauge field.

March 16 & 18, 2023 | 10:30am

• Dr. Junchen Rong will explain the basics of conformal field theory (CFT) and then discuss how to apply CFT methods to study various phase transitions such as structural phase transitions and quantum dimer models.

March 17 - 19, 2023 | 3:30pm

• Professor Fabien Alet will present the key features of the many-body localization phenomena, including relation to Anderson localization, experiments and numerical computations, the various numerical techniques for simulating MBL and provide a bird’s-eye view on open questions, future directions in the field and connect to other related phenomena.

March 17, 2023 | 10:30am

• Professor Yang Qi will show his team study on the phase fluctuations in the normal state of a general two-dimensional superconducting system with s-wave pairing.

April 25, 2023 | 4:00pm

• In this lecture, Professor Fakher Assaad will explain how topology, properties of an object that are preserved under continuous transformations, dominates our understanding of the solid state. 

April 26, 2023 | 1:00pm

• In this upcoming lecture, we will explore the fascinating relationship between physics and technology. Professor Kai Sun will invite you to share your thoughts on the most significant technological developments of the new millennium, and explain how each of them can be traced back to Nobel Prize-winning physics discoveries. 

April 26, 2023 | 4:30pm

• Heavy-fermion materials consist of arrays of magnetic impurities embedded in metallic environments. These compounds are characterized by a very large quasiparticle mass. They exhibit a host of fascinating quantum phase transitions, that we will discuss in detail during this lecture.  

April 27, 2023 | 3:30pm

• In this lecture, Prof Fakher Assaad will review work on a model of Dirac fermions that exhibit quantum spin-Hall and superconducting phases, and that realizes the notion of skymion superconductivity.

April 28, 2023 | 3:30pm

• In this lecture, We study flat bands and their topology in 2D materials with quadratic band crossing points (QBCPs) under periodic strain. 

May 3, 2023 | 3:30pm

• In this talk, Professor Wei Li will present a thermal data-driven and efficient approach learning the effective Hamiltonian of quantum magnets through tensor network simulations.

May 4, 2023 | 10:30am

• In this talk, Professor Michael M. Scherer will show some results on Gross-Neveu critical behavior using field theoretical approaches beyond the leading order.

May 4, 2023 | 3:30pm

• In this talk, Professor Michael M. Scherer will discuss how symmetries can emerge at such points based on renormalization group calculations and will also compare to recent quantum Monte-Carlo simulations and discuss conflicting results and open questions. 

May 6, 2023 | 10:00am

• In this lecture, Dr. Lukas Janssen will review our search for such collective phenomena in metals, semimetals, and correlated insulators. 

May 7, 2023 | 1:30pm

• Dr. Lukas Janssen will demonstrate that the Kitaev solution can be generalized to systems with spin and orbital degrees of freedom.  

June 2, 2023 | 10:00am

• In this lecture, Professor Xiang will delve into the physical background and fundamental ideas that underlie the development of this field. 

June 2, 2023 | 3:30pm

• In this lecture, Professor Jan von Delft will present a strategy, quantics TCI (QTCI), which combines the advantages of both schemes. 

June 3, 2023 | 3:30pm

• In this lecture, Professor Jan von Delft will address the sudden reconstruction of the Fermi surface (FS) at the Kondo breakdown (KB) quantum critical point (QCP) in heavy fermion systems.