People

Information:Name: Yuan-Yao He Gender: Male
Date of Birth: June 1991 Nationality: China Ph.D. in Physics Professor, Institute of Modern Physics, Northwest University
E-mail: heyuanyao@nwu.edu.cn heyuanyao@163.com

Education and Faculty position:Northwest University, Xi’an, Shaanxi Province, China Professor, since January 2022
Center for Computational Quantum Physics, Flatiron Institute, New York, New York, USA Flatiron Research Fellow, September 2018-March 2022
Renmin University of China, Beijing, China (GPA: 3.83/4.0) Ph.D. in physics, Department of Physics, September 2013-June 2018
Nankai University, Tianjin, China B.S. in physics, School of Physics, September 2009-June 2013 Bo Ling class by Training Plan of the National basic Subject top-notch Talent of China

Research Interests:Many-body numerical algorithms for strongly correlated systems, especially the Quantum Monte Carlo method.
Stripe orders, pseudogap behavior and the mechanism of superconductivity in high-temperature superconductors
Ultracold atom systems, including the Fermi gas and optical lattice
Topological States of Matter
The first-principle calculations for strongly correlated electron materials

Research Statement:The underlying physics in quantum many-body systems has been a center field of condensed matter physics for decades. There are so many amazing emergent physical properties in quantum many-body systems such as Superconductivity and Fractional Quantum Hall Effect, which is far beyond expectations in single-particle physical picture. Right now, I concentrate on numerical simulations of quantum many-body systems including both bosonic and fermionic models, by various numerical techniques such as Exact Diagonalization, several kinds of Quantum Monte Carlo methods and (Cluster) Dynamical Mean-Field theory. As for physics, my target is to search for novel quantum phases and exotic quantum phase transitions beyond the simple physical picture of noninteracting or mean-field theory, which can surely gain our knowledge of
fundamental physical laws for quantum many-body systems. As for numerical techniques, I personally prefer perfecting some existing numerical algorithms and even more developing fully
new many-body numerical algorithms.
Currently, I’m working on the finite-temperature Constrained-path Quantum Monte Carlo algorithm, a new method to handle the problems which have negative sign (or complex phase) problem in determinantal Quantum Monte Carlo algorithm. Within this new method, we can now access the physical properties of 2D doped Hubbard model at very low temperature with pretty high accuracy. We have already published a benchmark paper on this method combining with
stripe spin density wave physics in 2D doped Hubbard model. Recently, I’m concentrating on studying the finite-temperature spin and charge stripe physics in 2D doped Hubbard model, especially the evolution with lowering temperatures. Besides, I’m also working on the pseudogap physics in 2D doped Hubbard model.
Representative publications:1. Yuan-Yao He, Han-Qing Wu, Yi-Zhuang You, Cenke Xu, Zi Yang Meng, and Zhong-Yi Lu Bona fide interaction-driven topological phase transition in correlated SPT state Physical Review B, 93, 115150 (2016)
Preprint available at http://arxiv.org/abs/1508.06389
Publication version available at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.115150
2. Yan Qi Qin, Yuan-Yao He, Yi-Zhuang You, Zhong-Yi Lu, Arnab Sen, Anders W. Sandvik, Cenke Xu, Zi Yang Meng
Duality between the deconfined quantum-critical point and the bosonic topological transition Physical Review X, 7, 031052 (2017)
Preprint available at https://arxiv.org/abs/1705.10670
Publication version available at https://journals.aps.org/prx/abstract/10.1103/PhysRevX.7.031052
3. Yuan-Yao He, Mingpu Qin, Hao Shi, Zhong-Yi Lu, Shiwei Zhang
Finite-temperature Auxiliary-Field Quantum Monte Carlo: Self-Consistent Constraint and Systematic
Approach to Low Temperatures
Physical Review B, 99, 045108 (2019), Editors’ Suggestion
Preprint available at https://arxiv.org/abs/1811.07290
Publication version available at https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.045108
4. Yuan-Yao He, Hao Shi, Shiwei Zhang
Reaching the continuum limit in finite-temperature ab initio field-theory computations in many-fermion systems
Physical Review Letters, 123, 136402 (2019)
Preprint available at https://arxiv.org/abs/1906.02247
Publication version available at https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.136402