Open AccessWannier–Mott excitons in GaSe single crystals
Author(s) -
V.V. Zalamai,
N. N. Syrbu,
I.G. Stamov,
S. I. Beril
Publication year - 2020
Publication title -
journal of optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 95
eISSN - 2040-8986
pISSN - 2040-8978
DOI - 10.1088/2040-8986/ab9f17
Subject(s) - exciton , photoluminescence , materials science , reflection (computer programming) , spectral line , facet (psychology) , dispersion (optics) , optics , absorption (acoustics) , molecular physics , condensed matter physics , absorption spectroscopy , physics , optoelectronics , quantum mechanics , psychology , social psychology , personality , computer science , big five personality traits , programming language , composite material
The absorption, reflection and photoluminescence spectra of GaSe crystals with different thicknesses (100 nm–1 mm) were investigated in a wide temperature interval (300 K–10 K). Features due to excitonic states in the spectra were recognized. The contours of the excitonic reflection spectra measured at 10 K were calculated by dispersion equations. On the basis of these calculations, the parameters of the observed excitons were determined. Photoluminescence spectra from the cleaved surface and from the uncleaved facet of a sample were measured at low temperatures.