Bulletin of ANPA

Abstract submitted to ANPA Conference July 14–16, 2023

Volume 5, Number 1

Condensed Matter Physics and Material Science

Abstract ID: ANPA2023-N00072

Abstract:

ANPA2023-N00072: Observation of Flat and Weakly Dispersing Bands in a Niobium Halide Semiconductor with Breathing Kagome Lattice

Authors:

• Sabin Regmi; University of Central Florida; Current Affiliation: Idaho National Laboratory

• Anup Pradhan Sakhya; Department of Physics, University of Central Florida

• Tharindu Fernando; Department of Physics, University of Washington

• Yuzhou Zhao; Department of Physics, University of Washington

• Dylan Jeff; Department of Physics and NanoScience Technology Center, University of Central Florida

• Milo Sprague; Department of Physics, University of Central Florida

• Favian Gonzalez; Department of Physics and NanoSceince Technology Center, University of Central Florida

• Iftakhar Bin Elius; Department of Physics, University of Central Florida

• Mazharul Islam Mondal; Department of Physics, University of Central Florida

• Nathan Valadez; Department of Physics, University of Central Florida

• Damani Jarrett; Department of Physics, University of Central Florida

• Alexis Agosto; Department of Physics, University of Central Florida

• Jihui Yang; Department of Materials Science and Engineering, University of Washington

• Jiun-Haw Chu; Department of Physics, University of Washington

• Saiful I. Khondaker; Department of Physics and NanoScience Technology Center, University of Central Florida

• Xiaodong Xu; Department of Physics, University of Washington

• Ting Cao; Department of Materials Science and Engineering, University of Washington

• Madhab Neupane ; Department of Physics, University of Central Florida

Niobium halides Nb3X8 (X = Cl, Br, I), predicted two-dimensional magnets, are recently being studied for the electronic properties coming from the structural breathing kagome geometry. In this work, we have studied niobium bromide by utilizing angle-resolved photoemission spectroscopy, supporting first-principles calculations, and Raman spectroscopy measurements. Experimental results reveal that multiple flat and weakly dispersing bands are present in its electronic structure. The theoretical calculations well reproduce the experimental results and show that these bands have niobium d character, indicative of their origination from niobium breathing kagome plane. Time-dependent Raman measurements show that this material is stable down to ultrathin limit, establishing its promise in heterostructure fabrication and applications. Our results also bring out Nb3Br8 as a platform for the study of interplay among structural geometry, magnetism, electronic correlations in three- as well as two-dimensions. **This work is supported by the National Science Foundation (NSF) Career Grant DMR-1847962, the NSF Partnerships for Research and Education in Materials (PREM) grant DMR-2121953, and the Air Force Office of Scientific Research MURI Grant FA9550-20-1-0322.

To cite this abstract, use the following reference: https://anpaglobal.org/conference/2023/ANPA2023-N00072