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A Magneto‐Reflectivity Study of CuGaSe 2 Single Crystals
Author(s) -
Yakushev Michael V.,
Mudryi Alexander V.,
Faugeras Clement,
Martin Robert W.
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201800374
Subject(s) - exciton , reflectivity , bohr model , anisotropy , magnetic field , spectral line , bohr radius , atomic physics , materials science , molecular physics , chemistry , condensed matter physics , optics , physics , quantum mechanics , astronomy
CuGaSe 2 single crystals are studied using magneto‐reflectivity at 4.2 K in magnetic fields B up to 20 T. The A and B free excitons, observed in the optical reflectivity spectra, blue shift with increasing B . A low‐field perturbation approach within the anisotropic hydrogenic model is used to fit the dependence of the spectral position of these excitons on B . The A and B exciton reduced masses of 0.115 m 0 and 0.108 m 0 ( m 0 is the free electron mass), Rydbergs of 12.9 and 12.2 meV, Bohr radii 5.08 and 5.4 nm, and effective hole masses of 0.64 m 0 and 0.48 m 0 , respectively, are determined.