Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A13: Electronic Structure: Theory and Spectra
8:00 AM–10:48 AM,
Monday, March 4, 2024
Room: M100D
Sponsoring
Unit:
FIAP
Chair: Michael Zengel, University of Alabama
Abstract: A13.00013 : Energy gap and interband transitions in black phosphorus studied with momentum-resolved EELS*
10:24 AM–10:36 AM
Presenter:
Jin Chen
(University of Illinois at Urbana-Champai)
Authors:
Jin Chen
(University of Illinois at Urbana-Champai)
Dipanjan Chaudhuri
(University of Illinois at Urbana-Champaign)
Xuefei Guo
(University of Illinois at Urbana-Champaign)
Caitlin S Kengle
(University of Illinois at Urbana-Champai)
Farzaneh Hoveyda
(UIUC, MRL)
Christian M Boyd
(University of Illinois at Urbana-Champaign)
Elizabeth Peterson
(Los Alamos National Laboratory)
Yonatan Kahn
(University of Illinois at Urbana-Champaign)
Peter Abbamonte
(University of Illinois at Urbana-Champai)
We found that, as the temperature is lowered, the energy gap in bulk black phosphorus decreases for all momenta, from near the optical limit to the Brillouin boundary. We also observed, for T=30K, that a new peak emerges near the band edge, for momenta near the zone boundary. This peak may correspond to a dark exciton from the band structure changes at low temperature.
*This work was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20220135DR. P.A. acknowledges support from Gordon and Betty Moore Foundation EPiQS grant GBMF9452.
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