Magnon-bipolar carrier drag thermopower in antiferromagnetic/ferromagnetic semiconductors: Theoretical formulation and experimental evidence

The Nature of Thermopower in Bipolar Semiconductors

The thermoemf in bipolar semiconductors is calculated. It is shown that it is necessary to take into account the nonequilibrium distribution of electron and hole concentrations (Fermi quasilevels of the electrons and holes). We find that electron and hole electric conductivities of contacts of semiconductor samples with connecting wires make a substantial contribution to thermoemf. 72.20.Pa Typ...

Magnon-drag thermopile.

Thermoelectric effects in spintronics are gathering increasing attention as a means of managing heat in nanoscale structures and of controlling spin information by using heat flow. Thermal magnons (spin-wave quanta) are expected to play a major role; however, little is known about the underlying physical mechanisms involved. The reason is the lack of information about magnon interactions and of...

Signature of phonon drag thermopower in periodically modulated structures

A theory is presented to interpret the phonon drag magneto-thermopower oscillations observed in a periodically modulated two-dimensional electron gas. The thermoelectric and phonon drag tensors are obtained by solving a Boltzmann equation driven by an anisotropic electron-phonon scattering rate reflecting the twofold symmetry of the Fermi surface. It is shown that commensurability oscillations ...

Thermopower of correlated semiconductors: Application to FeAs2 and FeSb2

Jan M. Tomczak,1 K. Haule,1 T. Miyake,2,3 A. Georges,4 and G. Kotliar1 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA 2Nanosystem Research Institute, AIST, Tsukuba 305-8568, Japan 3Japan Science and Technology Agency, CREST, Kawaguchi 332-0012, Japan 4Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France Received 3 Ju...

Excess Carrier Phenomenon in Semiconductors