【直播】【青年科学半月谈】Quantum Monte Carlo and many-body problem in……

报告题目：

Quantum Monte Carlo and many-body problem in ultracold atoms

报告时间：

2023年5月11日（周四）15:00

报告嘉宾：

Hepeng Yao（日内瓦大学）

主办单位：

蔻享学术

直播通道

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报告人介绍

Hepeng Yao

Hepeng Yao is a postdoc researcher in the group of Prof. Thierry Giamarchi from the University of Geneva. He did his bachelor in Peking University (Beijing, China) and he finished his bachelor thesis in the group of Prof. Xuzong Chen. In 2020, he received his PhD from Ecole Polytechnique (Paris, France) under the supervision of Prof. Laurent Sanchez-Palencia. He received “CSC Award for outstanding self-financed students abroad” in 2020, and French DIM-SIRTEQ PhD grant in 2017.His main research interest is the theory of ultracold atom and quantum simulation, as well as their connection with experiments. Specifically, he mainly works on the effects and properties of low dimensional quantum gas, which includes localization in disordered and quasiperiodic systems, dimensional crossover, equilibrium correlation properties and etc. He is mainly working with advanced numerical techniques such as quantum Monte Carlo with worm algorithm implementations. He is an author of 5 theoretical paper in “Physical Review Letter”, where he is the first author for 3 of them. Also, he is a Referee for the “Physical Reviews” journals.

报告简介

In this talk, I will first introduce the quantum Monte Carlo method that is widely used in cold atom. More specifically, I will talk about path integral Monte Carlo and worm algorithm. Then, I will turn to its application in the research of ultracold atoms. I will start with the calculation of quantum phase diagram in both single lattice and quasiperiodic lattice[1,2]. Especially, I will present our recent study on the phase diagram for 1D shallow quasiperiodic lattice, where a Bose glass phase is found at finite temperature. Then, I will discuss the calculation for the momentum distribution and Tan contact of 1D bosons[3], where we find an interesting Bose-Fermi crossover behavior. Finally, if time allows, I will also talk about our recent research for systems at dimensional crossover[4].

[1]. H. Yao, T. Giamarchi and L. Sanchez-Palencia. PRL 125(6), 060401(2020)

[2]. R. Gautier, H. Yao and L. Sanchez-Palencia. PRL 126(11), 110401 (2021)

[3]. H. Yao, D. Clément, A. Minguzzi, P. Vignolo, L. Sanchez-Palencia, PRL 121, 220402 (2018)

[4]. H. Yao, L. Pizzino, T. Giamarchi, arXiv:2204.02240 (2022)

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编辑：吴良秀

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