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Hui Zhai   Professor

Education background

Jan. 2005: Doctor of Science, Physics, Center for Advanced Study, Tsinghua University, Beijing, China

Thesis title: Quantum Many-body Theory of Ultracold Atomic Gases

Advisor: Professor Chen-Ning Yang

Jun. 2002: Bachelor of Science, Physics, Department of Physics, Tsinghua University, Beijing, China


December 2015-Present: Professor, Institute for Advanced Study, Tsinghua University

August 2012-December 2015: Permenent Member, Institute for Advanced Study, Tsinghua University

July. 2009-July 2012: Member, Institute for Advanced Study, Tsinghua University

Sep. 2007-June 2009: Postdoc Scholar,Material Science Division, Lawrence Berkeley National Laboratory and Department of Physics, University of California at Berkeley

Jun. 2005-May 2007: Postdoc Scholar, Department of Physics, the Ohio-State University

Concurrent Academic

Edit Workgroup, of National Science Review, 2021.8-

Editorial Board Member, of Reports on Progress in Physics, 2020.5-

Editorial Board Member, of Machine Learning:Science and Technology, 2019.6-

Editorial Board Member, of Journal of Physics B, 2013.10-2017.12

Areas of Research Interests/ Research Projects

Theory of Quantum Matters/Ultracold Atomic Gases

1. Non-Equlibrium Physics of Quantum Matters

2. Novel Methods and Effects of Quantum Simulations with Ultracold Atoms

3. Interdisciplinary Research between Quantum Matter and Holographic Gravity, Machine Learning and Quantum Information Sciences.

Academic Achievement

Total publication: more than 100, including one in Science, four in Nat. Phys., two in Phy.Rev.X, 34 on Phys. Rev. Lett., one review article on Nat. Rev. Phys, and one review article on Rep. Prog. Phys. SCI total citation over 6000, and Google Scholar total citation over 8500. H-index 37 (Web of Science) / 43 (Google Scholar), with more than ten papers selected as ESI highly cited papers.

Textbook 《Ultracold Atomic Physics》published with Cambirdge press in 2021

My full publications:ResearchID

Google Scholar

More Group information:https://cloud.tsinghua.edu.cn/f/b402fc7a1fa44ebaaa33/

Representative Papers:

1. Novel Methods and Effects of Quantum Simulations with Ultracold Atoms

Our research utilizes the controllability of ultracold atoms and aims to develop new tools in controlling ultracold atoms and revealing new effects in ultracold atomic gases. These studies focus on spin-orbit coupling, topological states, and resonant interactions.

On Spin-Orbit Coupling: For bosons, we predict that the ground-state of spin-orbit coupled bosons can exhibit a stripe superfluid phase [1]. This prediction has been experimentally confirmed by the MIT group led by Ketterle and the USTC group. This paper has been cited more than 450 times. For fermions, in collaboration with the experimental group of Shanxi University, we first experimentally realize and study spin-orbit coupled degenerate Fermi gas with ultracold atoms [2]. This paper has been cited more than 700 times. We propose detecting the effect of spin-orbit coupling in degenerate Fermi gas by measuring the asymmetry of momentum distribution, which has been used in later experiments by Stanford, Florence, and HKUST groups.

On Topological Phases: We propose simulating the topological Haldane model using shaken optical lattices [3]. Later the ETH group has used the same method to realize the Haldane model experimentally. This experiment is cited to support the Nobel Prize for Haldane in 2016. Furthermore, we propose how to detect the topological invariant in far-from-equilibrium dynamics [4]. This proposal changes the conventional wisdom that the topological invariant mainly manifests itself in the near-equilibrium transport experiment. This theory has been experimentally confirmed by the Hamburg and the USTC groups.

On Resonant Interaction: We discovered a novel kind of magnetic tunable Feshbach resonance in alkaline-earth atoms, using the orbital degree of freedom, and we named it the “Orbital Feshbach Resonance.” [5] Soon, the Munich and the Florence group simultaneously announce the observation of “Orbital Feshbach Resonance” experimentally.  We predict the existence of repulsive polaron excitation for degenerate Fermi gas near a two-body resonance [6]. The Cambridge group experimentally studied this excitation, and the Florence group compared our results with their experiments and found reasonable agreement. The Munich group also utilize the advantage of the “Orbital Feshbach Resonance” to study the repulsive polaron.

2. Non-Equilibrium Dynamics in Quantum Matters

Our research focuses on the non-equilibrium dynamics in ultracold atoms and condensed matter systems. We systematically investigate the effects of symmetry, quantum entanglement, and many-body correlation in non-equilibrium dynamics processes.

On Symmetry: We theoretically discover a new type of quantum many-body dynamics that obeys a discrete scaling symmetry in time, termed as “the Efimovian Expansion” [7]. This prediction is confirmed experimentally by the ECNU group.

On Quantum Entanglement: We studied the newly-discovered out-of-time-ordered correlator (OTOC) and proved a theorem connecting the OTOC and the dynamics of entanglement entropy. We also reveal the behavior of the OTOC in the many-body localized phase [8]. This relation has also been used in one of the first experimental measurements of OTOC in collaboration with the USTC group.

On Many-Body Correlation: We establish the non-hermitian linear response theory that uses dissipation as a tool to probe many-body correlations [9]. This theory has been successfully applied to an experiment by the Paris LBK Lab.

3. Theory of Iron-Based Superconductor

We predict the pairing symmetry of iron pnictide superconductor using the functional renormalization group method [10]. This is one of the early works that correctly predict the pairing symmetry of iron-based superconductors, and this prediction has been confirmed by many experiments.  This paper has been cited more than 400 times.

[1] Spin-Orbit Coupled Spinor Bose-Einstein Condensates, Chunji Wang, Chao Gao, Chao-Ming Jian and Hui Zhai, Physical Review Letters, 105, 160403 (2010)

[2] Spin-Orbit Coupled Degenerate Fermi Gases, Pengjun Wang, Zeng-Qiang Yu, Zhengkun Fu, Jiao Miao, Lianghui Huang, Shijie Chai, Hui Zhai and Jing Zhang, Phys. Rev. Lett. 109, 095301 (2012)

[3] Floquet Topological States in Shaking Optical Lattices, Wei Zheng and Hui Zhai, Phys. Rev. A 89, 061603 (R),(2014)

[4] Scheme to Measure the Topological Number of a Chern Insulator from Quench Dynamics, Ce Wang, Pengfei Zhang, Xin Chen, Jinlong Yu and Hui Zhai, Phys. Rev. Lett., 118, 185701 (2017)

[5] Orbital Feshbach Resonance in Alkali-Earth Atoms, Ren Zhang, Yanting Cheng, Hui Zhai and Peng Zhang, Phys. Rev. Lett., 115, 135301 (2015)

[6] Stability of a Fully Magnetizied Ferromagnetic State in a Repulsively Interacting Ultracold Fermi Gases, Xiaoling Cui and Hui Zhai, Phys. Rev. A 81, 041602(R), (2010)

[7] Observation of the Efimovian Expansion in Scale-Invariant Fermi Gases, Shujin Deng, Zhe-Yu Shi, Pengpeng Diao, Qianli Yu, Hui Zhai, Ran Qi and Haibin Wu, Science, 335, 371 (2016)

[8] Out-of-Time-Order Correlation for Many-Body Localization, Ruihua Fan, Pengfei Zhang, Huitao Shen and Hui Zhai, Sci. Bull., 62, 707 (2017)

[9] Non-Hermitian Linear Response Theory, Lei Pan, Xin Chen, Yu Chen and Hui Zhai, Nat. Phys., 16, 767 (2020)

[10] Functional Renormalization-Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs-Based High Temperature Superconductor, Fa Wang, Hui Zhai, Ying Ran, Ashvin Vishwanath and Dung-Hai Lee, Phys. Rev. Lett., 102, 047005 (2009)

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