Anisotropic Corbino magnetothermopower in a quantum Hall system

Article

关键词: TRANSPORT;    THERMOPOWER;    ELECTRON;    HETEROJUNCTIONS;    SCATTERING;    GAAS;   

DOI  :  10.1103/PhysRevB.67.165311

来源: SCIE

【 摘 要 】

A Corbino-geometry contact configuration combined with a scanning laserspot as a heating source, is used for a thermovoltage mapping in a GaAs-AlGaAs quantum Hall device. For an isotropic system, the Corbino thermopower yields the diagonal component epsilon(xx) of the thermoelectric tensor, which should be zero under the prevailing condition of phonon drag. The experiments reveal that epsilon(xx) is large and anisotropic with respect to the crystallographic directions. The observations yield conclusive evidence that inhomogeneities are the origin for the existence of epsilon(xx).

【 授权许可】

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