Greetings from Bangkok.
Welcome to hybrid seminars in condensed matter physics at Mahidol University. The seminars are informal and meant to inspire discussions. If you would like to participate, please sign up to receive seminar announcements or contact us at kitinan.pon@mahidol.ac.th.
The seminars start at 13:00 (Thailand time) every Wednesday, unless otherwise announced.
Upcoming Seminar
26.11.2025 (Theo.)
Speaker: Chen Chuan (LZU)
Time: 13:00-14:00 (Thailand time)
Venue: online
Title: Kitaev Spin Liquid as the Mother of Competing Phases in Extended Kitaev Models
Abstract: The Kitaev honeycomb model hosts a quantum spin liquid with fractionalized anyons, but real materials include additional Γ and Γ′ interactions that drive rich magnetic behavior. I present a quasiparticle-based framework showing how gap closings of visons, fermions, and local bosons naturally organize transitions into zigzag, stripy, 120°, and incommensurate spiral phases. A notable outcome is that an antiferromagnetic Kitaev model with a ferromagnetic Γ term yields a phase that combines magnetic order with the fractionalization pattern of the Kitaev spin liquid. Depending on the sign of Γ′, the resulting order becomes either stripy or incommensurate. This viewpoint offers a unified way to understand many ordered phases in extended Kitaev models as descendants of the Kitaev spin liquid.