news
Recent News in the group.
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Chung Chi College General Education Outstanding Teaching Award
Prof. Yangqian Yan received the Chung Chi College General Education Outstanding Teaching Award, presented at the College Assembly on 16 January 2026. Link
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Postgraduate Research Output Award by Xin-Yuan Gao
Congratulations to Xin-Yuan Gao for winning the Postgraduate Research Output Award 2024/25 along with 7 other postgraduate students in CUHK. Xin-Yuan is the only awardee from the science faculty.
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Paper on the hollowing transition has been accepted by PRR
Our work on the Probing the hollowing transition of a shell-shaped BEC with collective excitation has been accepted by Physical Review Research.
While the miscible-immiscible transition for dual-species Bose-Einstein condensates is well-established in free space and has been measured in elongated traps, the behavior in spherically harmonic traps is markedly different. Due to the finite size of spherical traps, the transition becomes phase-transition-like, and the phase boundary for the interacting species’ scattering length differs drastically from the conventional miscible-immiscible transition. In this collaborative work with Dajun Wang’s experimental group at CUHK, we measured both in-phase and out-of-phase breathing modes. Due to spherical symmetry, these two modes completely decouple, and we found that the transition boundary occurs precisely at the local minimum of the out-of-phase breathing frequency.
Group member Kai-Yuen Lee is one of the co-first authors.
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Paper on the Thermodynamics of Spin-Imbalanced Fermi Gases with SU(N) Symmetric Interaction has been published by PRL
Our work on the Thermodynamics of Spin-Imbalanced SU(N) Fermi Gases has been published by PRL. This is a collaborative work with Prof. Jo’s experimental group at HKUST. We find an interesting non-monotonic dependence of the fluctuations on the number of minority spins in a spin imbalanced SU(N) system. Group member Xin-Yuan Gao is one of the co-first authors.
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Summer Camp for potential new students
Early application for MPhil-PhD programme for Fall 2026 is now open, the deadline is 10 June, 2025. Shortlisted applicants will be invited to the on-campus entrance exam and interview between 8-10 July 2025. See more Details and Poster
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Two Papers on the fate of thermalization for polar molecules has been published by PRL and PRA
Our work on the Fate of thermalization of ultracold fermions with two-body dissipation has been published by PRL. It also comes with a companion PRA paper Inelastic quantum Boltzmann equation of single-component Fermi gases for detailed analysis. It discusses the long time dynamics of a quantum system with two-body loss. Group member Xin-Yuan Gao is the first author.
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Paper on Geometric Origin of Self-Intersection Points in Non-Hermitian Energy Spectra has been published by PRB
Our work on Geometric Origin of Self-Intersection Points in Non-Hermitian Energy Spectra has been published by PRB. The non-Hermitian energy spectra of system with periodic boundary condition could be a spaghetti. This paper says that how exactly these spaghetti cross itself are related to the auxiliary generalized Brillouin zone (open chain) and the Brillouin zone (a concept for the periodic boundary condition, a unit circle). Note that auxiliary generalized Brillouin zone is a seemly purely mathematical concept, which could be think of the analytical continuation of the generalized Brillouin zone, a concept generalized to open quantum systems. Group member Jinghui Pi is the first author.
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Outstanding Student Award
Congratulations to GAO, Xin-Yuan on receiving the Outstanding Student Award.
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NSFC PhD Grant
Congratulations to GAO, Xin-Yuan on receiving the NSFC Basic Research Scheme for PhD Students 青年學生基礎研究科學基金項目(博士研究生) totaling 300K RMB from Jan 2025 to Dec 2026.
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Shenzhen University
4 PhD students attended the 冷原子多体量子物理与量子精密测量前沿讲习班@Shenzhen University
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2nd Dalian University of Technology Frontiers in Quantum Physics
Group member Xingli Li attended 2nd Dalian University of Technology Frontiers in Quantum Physics Symposium@Dalian.
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Free ChatGPT-4o
Thanks to TDLEG, we are providing all CUHK physics undergraduates with free access to the latest ChatGPT-4o at ai.yyan.prof. Along with it, we offer JupyterLab and Jupyter AI on the cloud.
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YGA2024
Group member Xingli Li attended YGA 2024@Macau.
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17th Youth Symposium on Cold Atom Physics
Group member Xin-Yuan Gao attended 17th Youth Symposium on Cold Atom Physics@Chong Qing.
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Best TA awards
Congratulations to LEE, Kai-Yuen and GAO, Xin-Yuan on receiving the Best TA Awards!
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DAMOP2024
Group member Nikola Lam and Xin-Yuan Gao attended DAMOP@Dallas.
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Croucher Summer Course 2024 Ultracold atom Physics
Group member Xin-Yuan Gao, Kai Yuen Lee, Nikola Lam, and Xingli Li attended Croucher Summer Course 2024 Ultracold atom Physics. Xin-Yuan delivered a 30-minutes talk.
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Hong Kong PhD Fellowship Scheme
Congratulations to LAU, Tsz Chun on receiving the Hong Kong PhD Fellowship Scheme.
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CN Yang Scholarship
Congratulations to GAO, Xin-Yuan on receiving the CN Yang scholarship.
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International Conference on Ultracold Atomic Gases
Group member Xin-Yuan Gao, Kai Yuen Lee, Nikola Lam, and Xingli Li attended International Conference on “Ultracold Atomic Gases”@HKU.
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Paper on the Loss Rate of Degenerate Polar Molecules has been published by PRL
Our work on the Temperature-Dependent Contact of Weakly Interacting Single-Component Fermi Gases and Loss Rate of Degenerate Polar Molecules lead by the Ph.D. student Xin-Yuan Gao from our group has been published by PRL. Building upon the p-wave contact theory developed by many pioneers including Z. Yu, J. H. Thywissen, S. Zhang, S. M. Yoshida and M. Ueda, S.-L. Zhang, M. He, and Q. Zhou, M. He, H. M. Chan, C. Lv, H.-Q. Lin, E. Braaten, P. Hagen, H.-W. Hammer, and L. Platter, etc., we successfully ed the mystery of quantum anomaly of chemical reaction of KRb polar molecules.
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DAMOP2023
Group member Xin-Yuan Gao attended DAMOP@Spokane.