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.

           

10^th forum（第十期）

报告人简介

 

 

 

Haoyu Guo (郭浩宇) is a Bethe/Wilkins/KIC postdoctoral fellow at Cornell University. He received his PhD in physics from Harvard University under the supervision of Prof. Subir Sachdev in 2023, and bachelor’s degree in physics and math from Massachusetts Institute of Technology in 2018. His current research interests are (1) Quantum matter without quasiparticles such as non-Fermi liquids and strange metals. (2) Thermal Hall effect of magnetic systems.

 

 

 

 

 

Abstract, time and venue:

 

From Sachdev-Ye-Kitaev Model to Strongly Correlated Metals

 

The Sachdev-Ye-Kitaev model is a soluble example of quantum matter without quasiparticles. After introducing the SYK model, I will describe a series of efforts to utilize the SYK model to construct strongly correlated metals. The first way is to consider a lattice of SYK models which capture a number of phenomenology of strange metal physics such as marginal fermi liquid and linear-in-temperature resistivity, but it does not have a well-defined fermi surface. Motivated by that, I will also describe the Yukawa-SYK model which applies the SYK idea to the problem of a fermi surface coupled to critical bosons in 2+1D. I will show that the SYK ingredients enable analytical control of the problem and we obtain a non-fermi liquid. Upon adding spatially disordered interactions, we obtain a strange metal.

 

Date: 2023.09.26

Time: 10:00 AM (UTC+8)

Online Venue: **

Zoom Link: https://hku.zoom.us/j/93768744357

 

 

References:

 

1.    Guo, Haoyu, Yingfei Gu, and Subir Sachdev. “Transport and Chaos in Lattice Sachdev-Ye-Kitaev Models.” Physical Review B 100, no. 4 (2019): 045140. https://doi.org/10.1103/PhysRevB.100.045140.

2.    Guo, Haoyu, Yingfei Gu, and Subir Sachdev. “Linear in Temperature Resistivity in the Limit of Zero Temperature from the Time Reparameterization Soft Mode.” Annals Phys. 418 (2020): 168202. https://doi.org/10.1016/j.aop.2020.168202.

3.    Esterlis, Ilya, Haoyu Guo, Aavishkar A. Patel, and Subir Sachdev. “Large N Theory of Critical Fermi Surfaces.” Physical Review B 103, no. 23 (2021): 235129. https://doi.org/10.1103/PhysRevB.103.235129.

4.    Guo, Haoyu, Aavishkar A. Patel, Ilya Esterlis, and Subir Sachdev. “Large $N$ Theory of Critical Fermi Surfaces II: Conductivity.” Physical Review B 106, no. 11 (September 30, 2022): 115151. https://doi.org/10.1103/PhysRevB.106.115151.

5.    Patel, Aavishkar A., Haoyu Guo, Ilya Esterlis, and Subir Sachdev. “Universal Theory of Strange Metals from Spatially Random Interactions.” Science 381, no. 6659 (August 18, 2023): 790–93. https://doi.org/10.1126/science.abq6011.