Seminar: Subsystem symmetries Induce exotic phases in an extended compass model

黄春炯

The University of Hong Kong

报告时间：2024年9月20日（周五）下午15:30

报告地点：紫金港校区段永平教学楼2号楼212报告厅

摘要：

Subsystem symmetries are of peculiar interest as their association with various exotic phenomena. In this work, we propose an extended compass model that incorporates subsystem symmetries and allows for the tunability of quantum phase transitions. The subsystem symmetries significantly restrict the mobility of spin excitations, leading to profound consequences. At the quantum critical point, we find the presence of a “critical Bose surface” along the entire kx and ky axes. Additionally, we identify a nodal-line spin liquid that undergoes nematic instability at low temperatures. In the ferro-quadrupole phase, we discover that a specific excitation is immobile individually, analogous to “type-I fractons”.

Reference: Phys. Rev. B 109, 214402 (2024)

报告人简介：

Chun-Jiong Huang is a computational physicist. He received his bachelor’s degree from Dalian University of Technology in 2014, and his Ph.D. in physics from the University of Science and Technology of China in 2019. From 2020 to 2023, he worked as a postdoctoral fellow in collaboration with Prof. Gang Chen at the University of Hong Kong. His main research interest is to apply Monte Carlo methods to study frustrated spin systems and the emergent exotic phases, especially including quantum and classical spin liquids. Recently, he has also been interested in spin-1 systems using semi-classical Monte Carlo methods.