Studies of thermoelectric effects in dimensionally constrained systems

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5379556

Davidson, J S

Detailed studies were made of the thermoelectric properties of a two-dimensional electron gas in the quantum Hall regime. These studies were done using single interface GaAs-Al/sub 3/Ga/sub 7/As heterostructures. Measurements of both components of the thermoelectric tensor have been made as functions of both temperature and applied magnetic field. When the chemical potential is either in the middle of a Landau level or midway between two Landau levels the thermopower is proportional to the entropy of the 2DEG. In the samples studied, the entropy is consistent with lifetime broadened Landau levels. The lifetime broadening is, in turn, consistent with the electronic lifetime determined from mobility studies of the samples. The thermopower in zero applied magnetic field is found to exhibit novel behavior which is attributed to a phonon drag contribution of sign opposite to that observed in bulk GaAs measurements.

• Research Organization: Minnesota Univ., Minneapolis (USA)
• OSTI ID: 5379556
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300300 -- Thermoelectric Generators
656000* -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM ARSENIDES
ALUMINIUM COMPOUNDS
ARSENIC COMPOUNDS
ARSENIDES
CONVERSION
DIRECT ENERGY CONVERSION
DOMAIN STRUCTURE
ELECTRICAL PROPERTIES
ENERGY CONVERSION
ENTROPY
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
HALL EFFECT
NESDPS Office of Nuclear Energy Space and Defense Power Systems
PHYSICAL PROPERTIES
PNICTIDES
THERMODYNAMIC PROPERTIES
THERMOELECTRIC CONVERSION
THERMOELECTRIC PROPERTIES