Bin-Bin Chen – Quantum Many-Body & Numerics

Postdoctoral fellow

Department of Physics, University of Hong Kong

Room 217, HOC Building

Email: bchenhku@hku.hk | bunbun.d.chan@gmail.com

Research Interests

Developing accurate methods in quantum many-body computations intrigues people in contemporary condensed matter physics and also other relevant fields, which also poses a great challenge. In particular, efficient simulations at finite temperature are indispensable to bridge theoretical many-body models to quantum material measurements, and are also of fundamental interest.

My 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, we 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), we 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.

Educations

Feb 2018 - Mar 2020	Joint PhD student in Ludwig-Maximilians University, Munich co-supervised by Andreas Weichselbaum, Wei Li Funded by: Grant WE4819/3-1 by German research foundation (DFG)
Sep 2015 - Jul 2021	PhD student in Beihang University, Beijing co-supervised by Wei Li, Ziyu Chen Major: Condensed Matter Physics
Sep 2011 - Jul 2015	Undergraduate student in Beihang University, Beijing Major: Applied Physics Graduate as Bachelor of Science in Physics

Publications

Oct 24, 2022	*“Quantum Monte Carlo sign bounds, topological Mott insulator and thermodynamic transitions in twisted bilayer graphene model”* Xu Zhang, Gaopei Pan, Bin-Bin Chen, Heqiu Li, Kai Sun, Zi Yang Meng arXiv:2210.11733 (2022)
Sep 15, 2022	*“Fermion disorder operator: the hedgehog and the fox of quantum many-body entanglement”* Weilun Jiang, Bin-Bin Chen, Zi Hong Liu, Junchen Rong, Fakher F. Assaad, Meng Cheng, Kai Sun, Zi Yang Meng arXiv:2209.07103 (2022)
Jul 18, 2022	*“Thermodynamic characteristic for correlated flat-band system with quantum anomalous Hall ground state”* Gaopei Pan, Hongyu Lu, Heqiu Li, Xu Zhang, Bin-Bin Chen, Kai Sun, Zi Yang Meng arXiv:2207.07133 (2022)
Mar 16, 2022	*“Topological disorder parameter: A many-body invariant to characterize gapped quantum phases”* Bin-Bin Chen, Hong-Hao Tu, Zi Yang Meng, and Meng Cheng Phys. Rev. B 106, 094415 (2022) arXiv:2203.08847 (2022)
Oct 4, 2021	*“Exciton Proliferation and Fate of the Topological Mott Insulator in a Twisted Bilayer Graphene Lattice Model”* Phys. Rev. Lett. 128, 157201 (2022) Xiyue Lin, Bin-Bin Chen, Wei Li, Zi Yang Meng, Tao Shi arXiv:2110.00200 (2021)
Jun 08, 2021	*“Network-Initialized Monte Carlo Based on Generative Neural Networks”* Hongyu Lu, Chuhao Li, Bin-Bin Chen, Wei Li, Yang Qi, Zi Yang Meng Chin. Phys. Lett. 39, 050701 (2022) arXiv:2106.00712 (2021)
Feb 10, 2021	*“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 arXiv:2102.05560 (2021)
Nov 15, 2020	*“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, and Zi Yang Meng Nature Communications 12, 5480 (2021) arXiv:2011.07602 (2020)
Aug 5, 2020	*“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) arXiv:2008.02179
Dec 5, 2019	*“Automatic Differentiation for Second Renormalization of Tensor Networks”* Bin-Bin Chen, Yuan Gao, Yi-Bin Guo, Yuzhi Liu, Hui-Hai Zhao, Hai-Jun Liao, Lei Wang, Tao Xiang, Wei Li, and Z. Y. Xie Phys. Rev. B 101, 220409(R) (2020) arXiv:1912.02780
Dec 30, 2017	*“Exponential Thermal Tensor Network Approach for Quantum Lattice Models”* Bin-Bin Chen, Lei Chen, Ziyu Chen, Wei Li, and Andreas Weichselbaum Phys. Rev. X 8, 031082 (2018) arXiv:1801.00142
Sep 5, 2016	*“Series-expansion thermal tensor network approach for quantum lattice models”* Bin-Bin Chen, Yun-Jing Liu, Ziyu Chen, and Wei Li Phys. Rev. B 95, 161104(R) (2017) arXiv:1609.01263
Aug 25, 2020	*“Kondo holes in the 2D itinerant Ising ferromagnet Fe3GeTe2”* Mengting Zhao, Bin-Bin Chen, Yilian Xi, Yanyan Zhao, Hongrun Zhang, Haifeng Feng, Jincheng Zhuang, Xun Xu, Weichang Hao, Wei Li, Si Zhou, Shi Xue Dou, and Yi Du Nano Lett. 2021, 21, 14, 6117–6123 arXiv:2008.10842 (2020)
Jul 18, 2019	*“Kosterlitz-Thouless melting of magnetic order in the triangular quantum Ising material TmMgGaO4”* Han Li, Yuan Da Liao, Bin-Bin Chen, Xu-Tao Zeng, Xian-Lei Sheng, Yang Qi, Zi Yang Meng, and Wei Li Nature Communications 11, 1111 (2020) arXiv:1907.08173
Apr 12, 2019	*“Thermal Tensor Renormalization Group Simulations of Square-Lattice Quantum Spin Models”* Han Li, Bin-Bin Chen, Ziyu Chen, Jan von Delft, Andreas Weichselbaum, and Wei Li Phys. Rev. B 100, 045110 (2019) arXiv:1904.06273
Nov 4, 2018	*“Two-temperature scales in the triangular-lattice Heisenberg antiferromagnet”* Lei Chen, Dai-Wei Qu, Han Li, Bin-Bin Chen, Shou-Shu Gong, Jan von Delft, Andreas Weichselbaum, and Wei Li Phys. Rev. B 99, 140404(R) (2019) arXiv:1811.01397