Equilibrium magnetization measurements of two-dimensional electron systems

Usher, A., Zhu, M., Matthews, A. J., Potts, A., Elliott, Martin ORCID: https://orcid.org/0000-0002-9254-9898, Herrenden-Harker, William, Ritchie, D. A and Simmons, M. Y 2004. Equilibrium magnetization measurements of two-dimensional electron systems. Physica E: Low-dimensional Systems and Nanostructures 22 (1-3) , pp. 741-744. 10.1016/j.physe.2003.12.113

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Abstract

The thermodynamic equilibrium magnetization of two-dimensional electron systems, embedded in GaAs-(Al,Ga)As heterojunctions, has been measured in the temperature range View the MathML source to View the MathML source in experiments using a highly sensitive torque magnetometer. Clear de-Haas–van-Alphen oscillations are observed for Landau-level filling factors between 3 and 52. Theoretical fits to the data show that the Landau levels are close to the idealized δ-function density of states, with a residual broadening of View the MathML source or less. A field- and energy-independent background density of states is invoked as a possible explanation of the shape of the oscillations. In one of the samples studied there is a ∼60% increase in Landau-level broadening, despite an increase in transport mobility of about the same percentage, on illumination. Analysis of the de-Haas–van-Alphen oscillations at small odd-integer filling factors reveals a g-factor exchange enhanced by up to 14.5 times.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QC Physics
Uncontrolled Keywords:	Magnetization; Two-dimensional electron system; Quantum Hall effect
Publisher:	Elsevier
ISSN:	1386-9477
Last Modified:	25 Oct 2022 09:39
URI:	https://orca.cardiff.ac.uk/id/eprint/59502

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