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Title: Orbital Symmetry and the Optical Response of Single-Layer MX Monochalcogenides

Journal Article · · Nano Letters

We show that the absorption spectra of single-layer GaSe and GaTe in the hexagonal phase feature exciton peaks with distinct polarization selectivity. We investigate these distinct features from first-principles calculations using the GW-BSE formalism. We show that, because of the symmetry of the bands under in-plane mirror symmetry, the bound exciton states selectively couple to either in-plane or out-of-plane polarization of the light. In particular, for a p-polarized light absorption experiment, the absorption peaks of the hydrogenic s-like excitons emerge at large angle of incidence, while the overall absorbance reduces over the rest of the spectrum.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1484757
Journal Information:
Nano Letters, Vol. 18, Issue 3; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (12)

Emergence of valley selectivity in monolayer tin( ii ) sulphide journal January 2019
Effects of interlayer interactions on the nanoindentation response of freely suspended multilayer gallium telluride journal January 2020
Second-harmonic generation in single-layer monochalcogenides: A response from first-principles real-time simulations journal July 2019
Saddle-Point Excitons and Their Extraordinary Light Absorption in 2D β-Phase Group-IV Monochalcogenides journal October 2018
Photoexcited charge carrier behaviors in solar energy conversion systems from theoretical simulations journal August 2019
Theory and Ab Initio Calculation of Optically Excited States—Recent Advances in 2D Materials journal December 2019
Controlling Defects in Continuous 2D GaS Films for High‐Performance Wavelength‐Tunable UV‐Discriminating Photodetectors journal November 2019
Two-dimensional O-phase group III monochalcogenides for photocatalytic water splitting journal October 2019
Tunable Electronic Properties and Giant Spontaneous Polarization in Graphene/Monolayer GeS van der Waals Heterostructure journal June 2019
Control of excitonic absorption by thickness variation in few-layer GaSe journal July 2019
Out-of-plane orientation of luminescent excitons in two-dimensional indium selenide journal September 2019
Control of excitonic absorption by thickness variation in few-layer GaSe text January 2017