APS Global Physics Summit 2026 Hong Kong Meeting Announced – HKIQST joins APS and PSHK as co-hosts| Monday, 23-27 March 2026 | HKPC Building, HK

HKIQST Co-Hosts APS Global Physics Summit 2026 Hong Kong Meeting – Strengthening Hong Kong’s role as a hub for international physics collaboration. Early Abstract Deadline Announced – Oral abstracts submitted by 5 January 2026 may be selected for the APS Virtual Session, offering global visibility for regional researchers. On-Site Programme Highlights – The Hong Kong meeting (23–27 March 2026) will […]

“Towards Semiconductor Topological Photonics” by Prof. Xiao HU | Monday, January 12, 2026, 2:00pm CYM522, HKU

Transforming the concept of band topology fostered in electron systems to electromagnetic waves opens a completely new direction for harnessing propagation of light. It is observed that electromagnetic modes in honeycomb photonic crystals exhibit Dirac-type frequency dispersions, which are accompanied by emergent spin degree of freedom, and that deforming the honeycomb structure in a designed way gives birth to a photonic analogue of quantum spin Hall effect. In this talk I will first show that the main physics can be captured phenomenologically by the k∙p theory, and discuss that the photonic topology can be characterized in terms of the Wilson loops based on the C_2 T symmetry. Then I will introduce examples to demonstrate how the recipe can be exploited for harnessing light and deriving advanced optic properties.