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A Magneto‐Reflectivity Study of CuInTe 2 Single Crystals
Author(s) -
Yakushev Michael V.,
Faugeras Clement,
Mudryi Alexander V.,
Martin Robert W.
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900464
Subject(s) - exciton , diamagnetism , effective mass (spring–mass system) , reflectivity , free electron model , bohr model , magnetic field , atomic physics , reduced mass , bohr radius , spectral line , electron , condensed matter physics , physics , optics , quantum mechanics , astronomy
CuInTe 2 single crystals are studied using optical magneto‐reflectance (MR) in magnetic fields B up to 20 T at 4.2 K. The spectra exhibit the A and B free excitons' blue shifting at increasing magnetic fields. Fitting quadratic functions to the experimental dependencies of the exciton spectral energy on B assuming a low field limit allow the determination of diamagnetic shift rates of 8.2 × 10 −5 and 8.5 × 10 −5 eV T −2 for the A and B free excitons, respectively. The excitons' reduced masses of 0.0575 m 0 and 0.0568 m 0 ( m 0 is the free electron mass), Rydbergs of 6.2 and 6.1 meV, and Bohr radii of 10.4 and 10.5 nm are then estimated. An electron effective mass of 0.062 m 0 and B sub‐band effective hole mass of 0.70 m 0 are determined using a literature value of the A valence sub‐band hole of 0.78 m 0 .