Magnetooptical absorption of polarons
Abstract
The linear magnetooptical absorption of a polaron is derived for the Faraday (active and inactive mode) and the Voigt configurations. Our calculation is intended to be valid for arbitrary electronphonon coupling constant, temperature, and magnetic fields. We start from the Kubo formula for the frequencydependent conductivity and show that the essential quantity which we have to calculate is the electron densitydensity correlation function. This function is obtained by using the anisotropic Feynman polaron model. At zero magnetic field our result reduces to the optical absorption corresponding to the FeynmanHellwarthIddingsPlatzman approximation for a Fröhlich polaron, as derived by Devreese et al. [Phys. Rev. B 5, 2367 (1972)]. For small electronphonon coupling the perturbation result is reobtained. Special attention is paid to the effect of the polaron instability [F.M. Peeters and J. T. Devreese, Phys. Rev. B 25, 7302 (1982)] on the magnetooptical absorption spectrum.
 Publication:

Physical Review B
 Pub Date:
 November 1986
 DOI:
 10.1103/PhysRevB.34.7246
 Bibcode:
 1986PhRvB..34.7246P
 Keywords:

 71.38.+i;
 76.40.+b;
 Diamagnetic and cyclotron resonances