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SUMMARY:Orbital topology induced orbital Hall effect in two-dimensional in
 sulators\, Prof. Tay-Rong Chang [張泰榕]\, NCKU
DTSTART:20260310T053000Z
DTEND:20260310T073000Z
DTSTAMP:20260420T130700Z
UID:indico-event-175@indico.phys.nthu.edu.tw
DESCRIPTION:The exploration of ground-state topology in quantum materials 
 has led to the discovery of a variety of exotic topological phases with un
 conventional Hall responses. In two-dimensional systems\, Chern insulators
  exhibit the quantum anomalous Hall effect\, while spin Chern insulators u
 nderlie the quantum spin Hall effect. Extending beyond charge and spin\, r
 ecent advances in orbitronics have revealed a transverse response of orbit
 al angular momentum—known as the orbital Hall effect.In this talk\, I wi
 ll introduce a comprehensive framework for understanding orbital Chern ins
 ulators (OCIs)—topological phases characterized by a nontrivial orbital 
 degree of freedom [1]. We not only establish the theoretical foundations o
 f OCIs but also identify two-dimensional phosphorene as a promising materi
 al platform for their realization. Our findings open new avenues for orbit
 al topology in materials science and could pave the way for novel topologi
 cal phases and orbitronics-based applications.1. Yueh-Ting Yao et al.\, Or
 bital topology induced orbital Hall effect in two-dimensional insulators\,
  Rep. Prog. Phys. 89 018001 (2026).\n\nhttps://indico.phys.nthu.edu.tw/eve
 nt/175/
URL:https://indico.phys.nthu.edu.tw/event/175/
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