arXiv subjects

T. M. Gassym

Publications and source records attributed to T. M. Gassym.

5 recordsLinked to original sources

arXiv2003

The influence of the mutual drag of carrier-phonon system on the thermopower and the transverse Nernst-Ettingshausen effect

The thermopower and Nernst-Ettingshausen (NE) effect in degenerate semiconductors and semimetals placed in high electric and magnetic fields are calculated by taking into account the heating of both electrons and phonons as well as their thermal and mutual drags. The magnetic and electric field dependences of the thermoelectric power and the transverse NE voltage are found in analytical forms. It is shown that in weak and high transverse magnetic fields, the electronic and phonon parts of NE coefficients change their sign for some scattering mechanisms.

cond-mat↗

arXiv2003

Thermoelectric power of nondegenerate Kane semiconductors under the conditions of mutual electron-phonon drag in a high electric field

The thermoelectric power of nondegenerate Kane semiconductors with due regard for the electron and phonon heating, and their thermal and mutual drags is investigated. The electron spectrum is taken in the Kane two-band form. It is shown that the nonparabolicity of electron spectrum significantly influences the magnitude of the thermoelectric power and leads to a change of its sign and dependence on the heating electric field. The field dependence of the thermoelectric power is determined analytically under various drag conditions.

cond-mat.stat-mech↗

arXiv2001

Distribution function of electrons and phonons in semiconductors and semimetals in high electric and quantizing magnetic fields

The distribution function of electrons and phonons interacting with electrons in semiconductors and semimetals in high electric and quantizing magnetic fields as a result of the solution of the coupled system of equations for the density matrixes of electrons and phonons is obtained. The effects of heating of electrons and phonons and their arbitrary mutual drag are taken into account. The dispersion relation of energy of electrons is assumed to be arbitrarily spherically symmetric one. The spectrum of phonons is assumed to be isotropic. The distribution function of electrons, phonons, the amplification coefficient of phonons and the dependence of chemical potential on "E", "H", "n" and "T_e" are obtained. The distribution function of phonons is obtained for arbitrary drift velocities of phonons.

cond-mat↗

arXiv2001

The theory of transvers Nernst--Ettingshausen effect and thermopower of heated (hot) charge carriers in nondegenerate semiconductors in the case of high anisotropy of phonons distribution function

The transverse Nernst--Ettingshausen effect and thermopower of hot charge carriers in nondegenerate impure semiconductors placed at high electric and nonquantized magnetic fields in the nondiffusion approximation is studied. Arbitrary heating and mutual drag of electrons and long wavelength phonons interacting with electrons are considered. The spectrum of electrons is assumed to be strong nonparabolic in Kane two--band approximation. The case when the electron concentration is high and frequent interelectronic collisions lead to the equilibrium symmetric part of the electron distribution function with effective electron temperature is considered.

cond-mat↗

arXiv2000

Superluminal Motion in The interacting System of Electrons, Positrons and Photons

The coupled system of Boltzman equations for the interacting system of electrons, positrons and photons in high external electric, E, and arbitrary magnetic, H, fields is solved. The consideration is made under the conditions of arbitrary heating and the mutual drag of carriers and photons. The non-stationary and non-uniform distribution function of photons for the all considered cases is obtained. It is shown that the distribution function of photons has the stationary limit for the drift velocities $(\vec{u}\vec{q}/ \hbar ω_q) <1 $ and grows exponentially with time for the drift velocities $(\vec{u}\vec{q}/ \hbar ω_q) \geq 1$. As a result of the analyses of the phenomena of coupling of the mutual drag system of carriers with the photons, we obtained some fundamental results: {\bf a)} the finiteness of the mass of photon (i.e. the rest mass of the photons is not zero); {\bf b)} reality of tachyons as a quasi-particles with a real mass in amplifying system (or regime); {\bf c)} the mechanism of the theory of relativity and that of the Doppler effect which coincides with the renormalization of frequency or mass as a result of the mutual drag of carriers and photons at external field (force) are the same. These conclusions were obtained as a result of the fact that the relativistic factor enters the expressions of the distribution function of photons and other physical expressions in the first order in the form $[1-(u^2/c^2) ]^{-1}$, but not in the form $[1-(u^2/c^2) ]^{-1/2}$ as in Einstein's theory. Also it is shown that the velocity of light is an average velocity of photons in the ground state.

quant-ph↗