Phys. Rev. B 68, 193404 (2003) [4 pages]

Multiple interacting bilayer electron system: Magnetotransport and heat capacity measurements

Abstract

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E. Grivei^1,*, S. Melinte^1,†, V. Bayot¹, H. C. Manoharan^2,‡, and M. Shayegan²
¹Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
²Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

Received 5 June 2003; published 12 November 2003

We report the fabrication, magnetotransport, and heat capacity measurements on a GaAs/AlGaAs multiple double-quantum-well heterostructure in the quantum Hall (QH) regime. Magnetotransport data reveal the existence of a correlated QH state at total Landau level filling factor ν_t=1. Near ν_t=2, we observe the nuclear contribution to the measured heat capacity of the Ga and As atoms in GaAs quantum wells. The heat capacity data indicate that Skyrmions are the lowest-energy excitations of the ν_t=2 ferromagnetic QH ground state.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.68.193404

DOI:

10.1103/PhysRevB.68.193404

PACS:

73.21.Ac, 73.43.Lp, 65.40.Ba

^*Present address: Timcal Belgium S.A., 2830 Willebroek, Belgium.

^†Corresponding author. Electronic address: melinte@dice.ucl.ac.be

^‡Present address: Geballe Laboratory for Advanced Materials, Stanford, CA 94305.

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Phys. Rev. B 68, 193404 (2003) [4 pages]

Multiple interacting bilayer electron system: Magnetotransport and heat capacity measurements