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Moldovan L, Melinte S, Bayot V, et al. Anomalous thermopower in the metalliclike phase of a 2D hole system. Phys Rev Lett. 2000;85(20):4369-72doi: 10.1103/PhysRevLett.85.4369.
Moldovan, L., Melinte, S., Bayot, V., Papadakis, S. J., De Poortere EP, & Shayegan, M. (2000). Anomalous thermopower in the metalliclike phase of a 2D hole system. Physical review letters, 85(20), 4369-72. https://doi.org/10.1103/PhysRevLett.85.4369
Moldovan, et al. "Anomalous thermopower in the metalliclike phase of a 2D hole system." Physical review letters vol. 85,20 (2000): 4369-72. doi: https://doi.org/10.1103/PhysRevLett.85.4369
Moldovan L, Melinte S, Bayot V, Papadakis SJ, De Poortere EP, Shayegan M. Anomalous thermopower in the metalliclike phase of a 2D hole system. Phys Rev Lett. 2000 Nov 13;85(20):4369-72. doi: 10.1103/PhysRevLett.85.4369. PMID: 11060640.
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Phys Rev Lett. 2000 Nov 13;85(20):4369-72. doi: 10.1103/PhysRevLett.85.4369.

Anomalous thermopower in the metalliclike phase of a 2D hole system.

Physical review letters

Moldovan, Melinte, Bayot, Papadakis, De Poortere EP, Shayegan

Affiliations

  1. Unite de Physico-Chimie et de Physique des Materiaux, Universite Catholique de Louvain, Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium and Department of Electrical Engineering, University of Oradea, 3700 Oradea, Romania.

PMID: 11060640 DOI: 10.1103/PhysRevLett.85.4369

Abstract

We report very low temperature ( T) thermopower and resistivity ( rho) measurements on variable-density, two-dimensional hole systems confined to GaAs quantum wells. As the hole density is lowered from 1.49x10(11) cm(-2) to 0.14x10(11) cm(-2), the system crosses from an insulating ( drho / dT less, similar0) to a metallic regime ( drho / dT>0) and finally displays insulating behavior ( drho / dT<0). Diffusion thermopower shows a striking sign reversal in a narrow range of density in the metallic regime, suggesting a qualitative change in the conduction or the scattering mechanism.

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