Theory of optical conductivity for dilute Ga1-x Mnx As

Cǎtǎlin Paşcu Moca, Gergely Zaránd, Mona Berciu

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6 Citations (Scopus)

Abstract

We construct a semimicroscopic theory, to describe the optical conductivity of Ga1-x Mnx As in the dilute limit, x∼1%. We construct an effective Hamiltonian that captures inside-impurity-band optical transitions as well as transitions between the valence band and the impurity band. All parameters of the Hamiltonian are computed from microscopic variational calculations. We find a metal-insulator transition within the impurity band in the concentration range, x∼0.2-0.3% for uncompensated and x∼1-3% for compensated samples, in agreement with the experiments. We find an optical mass mopt ≈ me, which is almost independent of the impurity concentration except in the vicinity of the metal-insulator transition, where it reaches values as large as mopt ≈10 me. We also reproduce a mid-infrared peak at ω≈200 meV, which redshifts upon doping at a fixed compensation, in quantitative agreement with the experiments.

Original languageEnglish
Article number165202
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number16
DOIs
Publication statusPublished - Oct 7 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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