Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N23: Electronic structure of topological materials (photoemission, etc.)-I
11:30 AM–2:18 PM,
Wednesday, March 8, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Azel Murzabekova, University of Illinois at Urbana-Champaign
Abstract: N23.00007 : Spectroscopic evidence of flat bands in breathing kagome semiconductor Nb3I8*
12:42 PM–12:54 PM
Presenter:
Madhab Neupane
(University of Central Florida)
Authors:
Madhab Neupane
(University of Central Florida)
Sabin Regmi
(University of Central Florida)
Tharindu Warnakulasooriya Fernando
(tharindu@uw.edu)
Yuzhou Zhao
(University of Washington)
Anup Pradhan Sakhya
(University of Central Florida)
Gyanendra Dhakal
(University of Central Florida)
Iftakhar Bin Elius
(University of Central FLorida)
Hector Vazquez
(University of Central Florida)
Jonathan D Denlinger
(Lawrence Berkeley National Laboratory, Berkeley, California)
Jihui Yang
(University of Washington)
Jiun-Haw Chu
(University of Washington)
Xiaodong Xu
(University of Washington)
Ting Cao
(University of Washington)
have been predicted to be two-dimensional (2D) magnets and importantly these materials possess breathing kagome geometry. Electronic structure study of these promising
materials is still lacking. Here, we report the spectroscopic evidence of flat and weakly dispersing bands in breathing-kagome semiconductor Nb3I8 around 500 meV binding energy, which is well supported by our first-principles calculations. These bands originate from the breathing kagome lattice of Niobium atoms and have Nb d character. They are found to be sensitive to polarization of the incident photon beam. Our study provides insight into the electronic structure and at band topology in an exfoliable kagome semiconductor thereby providing an important platform to understand the interaction of geometry and electron correlations in 2D material.
*M. N. acknowledges the support from the National Science Foundation (NSF) CAREER award DMR-1847962, the Air Force Office of Scientific Research MURI GrantNo. FA9550-20-1-0322, and NSF Partnerships for Research and Education in Materials (PREM) Grant DMR-2121953.
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