NEWS & EVENTS Event Calendars Event

Time & Date

16:00-17:30, Thursday, October 21st, 2021

Venue

Room 211, Building 4, Yunqi Campus

Host

Dr. Congjun Wu, Chair Professor, School of Science

Audience

Faculty and Staff,Graduate Students,Undergraduate Students

Category

Academics and Research

Institute for Theoretical Sciences Lecture丨Bose-Einstein condensations of magnons in quantum magnets with spin-orbit coupling

Time: 16:00-17:30, Thursday, October 21st, 2021

Venue: Room 211, Building 4, Yunqi Campus


Host: Dr. Congjun Wu, Chair Professor, School of Science


Speaker: Prof. Jinwu Ye, Mississippi State university


Title:Bose-Einstein condensations of magnons in quantum magnets with spin-orbit coupling


Biography:

Yinwu Ye received his Ph.D. degree from Yale University. He is the professor at Mississippi State University. Currently, He is a long-term visitor at Institute for Theoretical Sciences at Westlake University. His two most recent research directions are on

(1) Topological Phases, topological phase transitions driven by interactions in various spin-orbit coupled systems.

(2) Quantum chaos and quantum information scramblings in cavity QED systems or in Sachdev-Ye-Kitaev (SYK) models. Connections among SYK models, conformal field theory, quantum gravity and topological phases.


Abstract:

We study the response of a quantum magnet with spin-orbit coupling (SOC) to a Zeeman field and find novel classes of quantum phase transitions driven by the magnon condensations at commensurate (C-) or in-commensurate (IC-) momenta. We identify a new type of dangerously irrelevant operator which is irrelevant near the transition, does not change the symmetry breaking ground state, but changes its excitation spectrum to an exotic form. We name the new one Type-II dangerously irrelevant operator in contrast to the previously known one which we name Type-I. We derive the relations between the quantum spin and the order parameters of the effective actions which is crucial to determine the spin-orbital structures of all these quantum phases. The intrinsic differences between the magnon condensations at the C- and IC- momenta are explored. The experimental implications to cold atoms or materials with SOC are presented.

Time & Date

16:00-17:30, Thursday, October 21st, 2021

Venue

Room 211, Building 4, Yunqi Campus

Host

Dr. Congjun Wu, Chair Professor, School of Science

Audience

Faculty and Staff,Graduate Students,Undergraduate Students

Category

Academics and Research