Influence of light waves on the thermoelectric power under large magnetic field in III-V, ternary and quaternary materials

Abstract

Key words Light waves, thermoelectric power, III-V, ternary and quaternary materials. PACS 73.50.Pz, 78.55.Cr We study theoretically the influence of light waves on the thermoelectric power under large magnetic field (TPM) for III-V, ternary and quaternary materials, whose unperturbed energy-band structures, are defined by the three-band model of Kane. The solution of the Boltzmann transport equation on the basis of this newly formulated electron dispersion law will introduce new physical ideas and experimental findings in the presence of external photoexcitation. It has been found by taking n-InAs, n-InSb, n-Hg1−xCdxTe and n-In1−xGaxAsyP1−y lattice matched to InP as examples that the TPM decreases with increase in electron concentration, and increases with increase in intensity and wavelength, respectively in various manners. The strong dependence of the TPM on both light intensity and wavelength reflects the direct signature of light waves that is in direct contrast as compared with the corresponding bulk specimens of the said materials in the absence of external photoexcitation. The rate of change is totally band-structure dependent and is significantly influenced by the presence of the different energy-band constants. The well-known result for the TPM for nondegenerate wide-gap materials in the absence of light waves has been obtained as a special case of the present analysis under certain limiting conditions and this compatibility is the indirect test of our generalized formalism. Besides, we have also suggested the experimental methods of determining the Einstein relation for the diffusivity:mobility ratio, the Debye screening length and the electronic contribution to the elastic constants for materials having arbitrary dispersion laws.

Single-photon controlled thermospin transport in a resonant ring-cavity system

“…= Tr ρs (t) ĵth,i (r) (11) calculated by the expectation value of the spin polarization current density operator [24].…”

“…On the other hand, the influences of light on thermoelectric effects have been investigated and shown that the thermoelectric power can be enhanced by increasing the intensity of light [11]. It was also found that a polarized light can induce a Fano-like resonance in the thermal conductance [12].…”

Thermoelectric Power in Quantum Dots Under Large Magnetic Field

“…The electron concentration can be written as 13 is the broadening parameter in this case, and M 23 D 1 C A 2 13 C 2A 13 cos H 13 .…”

“…13 Plot of the normalized TPSM in QDs of InSb as a function of carrier concentration for all the cases ofFig. 1.9…”