PIRSA:17050088

Topological states in honeycomb materials

Kee, H. (2017). Topological states in honeycomb materials. Perimeter Institute. https://pirsa.org/17050088

Kee, Hae-Young. Topological states in honeycomb materials. Perimeter Institute, May. 25, 2017, https://pirsa.org/17050088 

          @misc{ pirsa_PIRSA:17050088,
            doi = {10.48660/17050088},
            url = {https://pirsa.org/17050088},
            author = {Kee, Hae-Young},
            keywords = {Condensed Matter},
            language = {en},
            title = {Topological states in honeycomb materials},
            publisher = {Perimeter Institute},
            year = {2017},
            month = {may},
            note = {PIRSA:17050088 see, \url{https://pirsa.org}}
          }

Hae-Young Kee

University of Toronto

Talk number
PIRSA:17050088
Collection
Talk Type
Subject
Abstract
The topological Haldane model (THM) on a honeycomb lattice is a prototype of systems hosting topological phases of matter without external fields. It is the simplest model exhibiting the quantum Hall effect without Landau levels, which motivated theoretical and experimental explorations of topological insulators and superconductors. Despite its simplicity, its realization in condensed matter systems has been elusive due to a seemingly difficult condition of spinless fermions with sublattice-dependent magnetic flux terms. While there have been theoretical proposals including elaborate atomic-scale engineering, identifying candidate THM materials has not been successful, and the first experimental realization was recently made in ultracold atoms. Here we suggest that a series of Fe-based honeycomb ferromagnetic insulators, AFe2(PO4)2 (A=Ba,Cs,K,La) possess Chern bands described by the THM.