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HKIQST Co-Hosts the APS Global Physics Summit 2026 in Hong Kong| Monday, 23-27 March 2026 | HKPC Building, HK

HKIQST is proud to co-host the APS Global Physics Summit 2026 Hong Kong Meeting, offering researchers across the Asia-Pacific region the most accessible pathway to participate in this premier international physics gathering. Dual Access: Registration for the Hong Kong meeting includes full online access to the APS Global Physics Summit (15–20 March 2026), at a significantly reduced cost compared to direct APS registration. Participants can attend live-streamed talks, revisit recordings for 90 days, and explore e-posters without additional fees. Abstract Submission: Oral abstracts submitted by 5 January 2026 may be selected for inclusion in the official APS Virtual Session. On-Site Programme: The Hong Kong meeting (23–27 March 2026) will feature a dynamic in-person academic environment, with oral and poster presentations, networking opportunities, and engagement with a diverse community of physicists from across the region. 📍 Venue: Hong Kong Productivity Council, Kowloon Tong 🤝 Organised jointly with PSHK, and supported by APS, HKIQST, and Qebula Mind Ltd. For registration and more information, please access: https://www.qebulamind.com/aps-conference2026

CTCP Seminar: “Recognizing gapless phases in quantum many-body physics” by Prof. Yuan YAO on Wednesday, February 11, 2026, 4:00pm CYM522, HKU

The spectral gap of quantum many-body Hamiltonians is an important but difficult concept in condensed matter. Its identification is complicated and, quite often, controversial because the gap, together with the ground-state degeneracy is a thermdynamic limit notion rather than any finite-size energy splitting. In this talk, we will discuss a gaplessness indicator. Specifically, we prove that the ground state(s) of an SO(3)-symmetric gapped spin chain must be spin singlet(s), and the expectation value of a twisting operator asymptotically approaches unity in the thermodynamic limit, where finite-size corrections are inversely proportional to the system size. This theorem provides (i) supporting evidence for various conjectured gapped phases, and, contrapositively, (ii) a sufficient criterion for identifying gapless spin chains. We test the efficiency of our theorem by numerical simulations for a variety of spin models and show that it indeed offers a novel efficient way to identify gapless phases in spin chains with spin-rotation symmetry.
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