People

Dr. Bin-Bin Chen is a Research Assistant Professor at the Department of Physics, University of Hong Kong. He is an expert in density matrix/tensor network renormalization methods, and has applied them to the studies of various strongly correlated system, such as 2D Hubbard model, twisted bilayer graphene. He received his Ph.D. degree from Beihang University in 2021, and worked as a postdoctoral fellow at the Department of Physics, University of Hong Kong.

Dr. Chen's research interest focuses on the efficient numerical simulations of quantum many-body systems, including both spin and fermion systems. Working on the tensor network state, an efficient wave-function ansatz, His group have proposed several finite-temperature algorithms, in order to accurately simulate strongly correlated systems and calculate the thermodynamic properties down to low temperature.

Utilizing the powerful tensor network methods, mainly the exponential tensor renormalization group (XTRG) and the renowned density matrix renormalization group (DMRG), his group simulate frustrated spin systems as well as fermion systems with high precision, and discover novel many-body phenomena, including, two-temperature scale and the Kosterlitz-Thouless phase in frustrated spin systems, chiral spin liquid in triangular lattice Hubbard model, etc.

1. “Realization of Topological Mott Insulator in a Twisted Bilayer Graphene Lattice Model”, Bin-Bin Chen, Yuan Da Liao, Ziyu Chen, Oskar Vafek, Jian Kang, Wei Li, Zi Yang Meng, Nature Communications 12, 5480 (2021)

2. “Exciton Proliferation and Fate of the Topological Mott Insulator in a Twisted Bilayer Graphene Lattice Model”, Xiyue Lin, Bin-Bin Chen, Wei Li, Zi Yang Meng, Tao Shi, Phys. Rev. Lett. 128, 157201 (2022)

3.  

   “Exponential Thermal Tensor Network Approach for Quantum Lattice Models”, Bin-Bin Chen, Lei Chen, Ziyu Chen, Wei Li, Andreas Weichselbaum, Phys. Rev. X 8, 031082 (2018)

4.  

   “Tangent Space Approach for Thermal Tensor Network Simulations of the 2D Hubbard Model”, Qiaoyi Li, Yuan Gao, Yuan-Yao He, Yang Qi, Bin-Bin Chen (corresponding author), Wei Li, Phys. Rev. Lett. 130, 226502 (2023)

5.  

   “Topological disorder parameter: A many-body invariant to characterize gapped quantum phases”, Bin-Bin Chen, Hong-Hao Tu, Zi Yang Meng, Meng Cheng, Phys. Rev. B 106, 094415 (2022)

6.  

   “Quantum Spin Liquid with Emergent Chiral Order in the Triangular-lattice Hubbard Model”, Bin-Bin Chen, Ziyu Chen, Shou-Shu Gong, D. N. Sheng, Wei Li, Andreas Weichselbaum, Phys. Rev. B 106, 094420 (2022) Editors' Suggestion

7.  

   “Ubiquitous nematic Dirac semimetal emerging from interacting quadratic band touching system”, Hongyu Lu, Kai Sun, Zi Yang Meng, Bin-Bin Chen, Phys. Rev. B 109, L081106 (2024)

8.  

   “Phases of (2+1)D SO(5) non-linear sigma model with a topological term on a sphere: multicritical point and disorder phase”,  Bin-Bin Chen, Xu Zhang, Yuxuan Wang, Kai Sun, Zi Yang Meng, arXiv:2307.05307 (2023)

9.  

   “Quantum Many-Body Simulations of the 2D Fermi-Hubbard Model in Ultracold Optical Lattices”, Bin-Bin Chen, Chuang Chen, Ziyu Chen, Jian Cui, Yueyang Zhai, Andreas Weichselbaum, Jan von Delft, Zi Yang Meng, and Wei Li, Phys. Rev. B 103, L041107 (2021)

10.  

    “Series-Expansion Thermal Tensor Network Approach for Quantum Lattice Models”, Bin-Bin Chen, Yun-Jing Liu, Ziyu Chen, Wei Li, Phys. Rev. B 95, 161104 (R) (2017)

1. A_HKU703/22 - Automate: Advanced Numerical Methods for Highly Entangled Quantum Matter