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Thermopower and thermomagnetic effects in kane semiconductors under conditions of electron and phonon heating and their mutual drag
Author(s) -
Gasymov T. M.,
Katanov A. A.,
Babaev M. M.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221190145
Subject(s) - condensed matter physics , phonon drag , seebeck coefficient , phonon , electron , physics , drag , magnetic field , thermoelectric effect , quantum mechanics , mechanics
The thermopower and the transverse Nernst‐Ettingshausen (NE) effect of degenerate semiconductors with Kane electron spectrum are considered taking account of electron and phonon heating and their mutual drag. It is established that in absence of a mutual drag and phonon heating the electron part of the thermopower V e as well as the NE voltage U grow sharply on raising the external electric field strength ˜ E 4 while the phonon part of the thermopower V p does not depend upon E . It is shown that the phonon heating leads to a growth of the phonon parts V p and U p with E : V p ˜ E 2 and U p ˜ E 6 . The nonparabolicity of the electron spectrum results in the growth of the phonon parts and the decrease of the electron parts of the thermopower and NE voltage if the phonons are nonheated. Mutual drag leads to a higher growth of all the above‐mentioned effects on raising the mutual drag degree γ 0 if the electrons and phonons are heated. In the parabolic case under the conditions of a strong mutual drag (γ 0 → 1) U p = 0. If the electrons are scattered by piezoacoustic phonons in a weak magnetic field the electron part of the NE coefficient Q e firstly decreases with growing γ 0 (being positive), reaches zero at γ 0 = 2/9, and then reverses its sign and grows in magnitude. A similar situation takes place in a strong magnetic field also, the only difference is that Q e = 0 at γ 0 = 2/5.