A Magneto‐Reflectivity Study of CuInTe₂ Single Crystals

Abstract

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 Â 10 À5 and 8.5 Â 10 À5 eV T À2 for the A and B free excitons, respectively. The excitons' reduced masses of 0.0575m 0 and 0.0568m 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 0.062m 0 and B sub-band effective hole mass of 0.70m 0 are determined using a literature value of the A valence sub-band hole of 0.78m 0 .