Ultra-cold atomic gas refers to cooling atom clouds to the order of nK to achieve Bose-Einstein condensate (BEC) or degenerate Fermi gas by utilizing laser cooling technology. So far, the quantum gases have been experimentally realized in different neutral atomic systems, including rubidium, potassium, sodium, strontium, lithium, cesium, etc. By adjusting the number of atomic species, spin degree of freedom, trapping potential, inter-atomic interaction, effective magnetic field, spin-orbit coupling, and phase distribution, it can provide a clean, ideal, and controllable model system for studying specific physical effects and searching for novel quantum phenomena, making the neutral atomic quantum system an important experimental platform for quantum simulation. 

Our research group takes neutral atomic quantum systems as the research object and studies the many-body problem of the quantum gas through both analytical methods and numerical simulation methods. At present, our research group has one professor, one associate professor, and one lecturer. Our research mainly involves: 

Quantum Circulation and Atomic Devices: Atomic electronics refers to manipulating atoms through micro-magnetic fields or laser-generated microoptical circuits to create atomic devices and atomic circuits, thereby developing new functions that cannot be achieved by electronic circuits while avoiding lattice defects, phonon scattering, and other problems that emerged in solid-state systems. Through the construction of quantum circulation and Josephson junctions, our research group studies the effective circuit under different geometric configurations and designs functional atomic devices (theoretical proposal). 

Many-body physics in curved space: Spacetime has become an experimentally controllable factor. For instance, geometric configurations such as the torus, spherical shell, and hyperbolic space have been simulated, and macroscopic cosmological phenomena such as black holes, Hawking radiation, the Unruh effect, and cosmic expansion phenomena have been demonstrated in cold atomic experiments. Our research group studies the motion law of particles and the many-body problem in curved space. We aim to figure out the influence of spatial curvature on physical properties such as quantum coherence, quantum fluctuation, and quantum phase transition. 

Vortex-line braiding dynamics: Braiding theory is a branch of algebraic topology that studies how to embed several rings into a three-dimensional Euclidean space. By generating vortex lines or vortex rings in the BEC system, our research group explores the dynamic formation process of vortex-line braiding during collision between vortex lines, analyzes the conditions required for the formation of braiding between vortex lines, the lifetime of braiding, and its decay process, and summarizes the evolution law and the role of vortex in quantum turbulence. 

Group Members:

Yang Tao

Zheng Jun-Hui

Bai Wenkai 

Students: 

Jia Xiaoyu (Doctoral student, 2018) 

Yang Xue (Doctoral student, 2019)

Chen Xiyu (Master student, 2021)

Yang shanhu (Master student, 2022)

Cui Zhenqian (Master student, 2022)

Ye Chan (Master student, 2022)

Jiao Chen (Doctoral student, 2023)

Muhammad Munsif (Doctoral student, 2023) 

Zhao Mei (Master student, 2023)

Alumni:

Rong Du (Master, 2022) 

Zhen Zhang (Master, 2023) 

Nie Yuhang (Master, 2023)

Xing Jiancong (Ph.D, 2023)