香港大学-中国科学院大学 青年物理学者论坛
HKU-UCAS young physicist forum
本论坛由香港大学-中国科学院大学理论与计算物理联合研究所香港和北京分部共同承办。旨在促进青年物理学者互相的交流和讨论。不同于寻常的短平快形式的科学报告，我们主要集中于更为系统、全方位、由浅入深地讲解当前物理的各个前沿方向。报告人主要是目前活跃于科研一线的年轻学者。
This forum is hosted by the HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong and Beijing. It aims to promote interchanges and discussions among young physicists. Different from ordinary scientific reports in the short, simple and quick form, we mainly focus on explaining and introducing various frontier directions of current physics in a more systematic, all-round way and from the shallower to the deeper. The speakers are mainly young scholars who are currently active in the front line of scientific research.
9th
forum（第九期）
报告人简介
Chunxiao Liu (刘春骁) is a Moore postdoctoral
fellow at the University of California, Berkeley. He received his Ph.D. in
Physics from the University of California, Santa Barbara in 2021, where he
worked under the supervision of Prof. Leon Balents.
He is interested in a broad range of topics in condensed matter physics and
quantum dynamics, including frustrated magnetism and quantum spin liquids,
symmetry protected and symmetry enriched topological
phases, entanglement dynamics in quantum circuits and quantum state
preparation, etc.
Abstract, time and venue:
Entanglement and
non-unitary dynamics of the Sachdev-Ye-Kitaev models
The SYK models are a family of
random q-fermion interacting models that are large-N solvable. The models are
physically interesting because they exhibit chaotic and non-fermi liquid
behaviors and possess a gravity dual description (q>=4). In this talk I will
first review the entanglement aspects of the SYK models. Then, I will turn to
the study of the non-unitary dynamics of certain SYK chains, with a particular
focus on the monitored Brownian Sachdev-Ye-Kitaev
(SYK) model, which exhibits a measurement-induced phase transition (MIPT). I
will show how this MIPT can be understood as a symmetry-breaking transition of
an effective Z4 magnet in the replica space.
Date: 2023.09.25
Time: 10:00 AM (UTC+8)
Online Venue: **
Zoom Link: https://hku.zoom.us/j/97978752943?pwd=U0FqTjVzTDZxSVpobW9HcDJWSFVodz09
References:
1.
Quantum entanglement of the Sachdev-Ye-Kitaev models, CL, Chen, Balents,
Physical Review B 97 (24), 245126
2.
Subsystem Renyi Entropy of
Thermal Ensembles for SYK-like models, Zhang, CL, Chen, SciPost
Phys 8, 094
3.
Non-unitary dynamics of Sachdev-Ye-Kitaev
chain, CL, Zhang, Chen, SciPost Physics 10 (2), 048
4.
Measurement-induced phase transition in the monitored sachdev-ye-kitaev model, Jian, CL,
Chen, Swingle, Zhang, Physical Review Letters 127 (14), 140601