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Phys. Rev. Lett. 85, 4369–4372 (2000)

Anomalous Thermopower in the Metalliclike Phase of a 2D Hole System

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L. Moldovan1,2, S. Melinte1, V. Bayot3, S. J. Papadakis4, E. P. De Poortere4, and M. Shayegan4
1Unité de Physico-Chimie et de Physique des Matériaux, Université Catholique de Louvain, Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium
2Department of Electrical Engineering, University of Oradea, 3700 Oradea, Romania
3Microelectronics Laboratory, Université Catholique de Louvain, Place du Levant 3, B-1348 Louvain-la-Neuve, Belgium
4Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544

Received 5 July 2000; published in the issue dated 13 November 2000

We report very low temperature ( T) thermopower and resistivity ( ρ) measurements on variable-density, two-dimensional hole systems confined to GaAs quantum wells. As the hole density is lowered from 1.49×1011cm-2 to 0.14×1011cm-2, the system crosses from an insulating ( dρ/dT≲0) to a metallic regime ( dρ/dT>0) and finally displays insulating behavior ( dρ/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.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.4369
DOI:
10.1103/PhysRevLett.85.4369
PACS:
73.40.-c, 71.30.+h, 73.50.Lw
 
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