Highfrequency zerophonon conductivity of disordered twolevel atom systems
Abstract
In the present paper, the Kubo equation of conductivity is applied to the calculation of the zerophonon highfrequency conductivity of disordered twolevel atom systems at low temperatures. A general expression is derived, making allowance for the contribution (to conductivity) of diagonal and nondiagonal (with respect to operators) nodes of the electron dipole moment. The important role of these contributions both in the singlelevel (singleband) and twolevel (twoband) models of disordered systems is demonstrated. The frequency dependence of zerophonon conductivity in electron intraband and interband transitions is studied for a continuous Gaussian density distribution of the atomic electron levels.
 Publication:

Ukrainskii Fizicheskii Zhurnal
 Pub Date:
 March 1978
 Bibcode:
 1978UkFiZ..23..403F
 Keywords:

 Atomic Energy Levels;
 Electrical Resistivity;
 Electron Phonon Interactions;
 High Frequencies;
 Conduction Bands;
 Dipole Moments;
 Energy Distribution;
 Low Temperature Physics;
 Normal Density Functions;
 Atomic and Molecular Physics