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Equilibrium magnetization measurements of two-dimensional electron systems

Usher, A., Zhu, M., Matthews, A. J., Potts, A., Elliott, M., Herrenden-Harker, W. G., 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.

Record type: Article


The thermodynamic equilibrium magnetization of two-dimensional electron systems, embedded in GaAs-(Al,Ga)As heterojunctions, has been measured in the temperature range 50 mK to 1 K 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 delta-function density of states, with a residual broadening of similar to 0.3 meV 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 similar to 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.

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Published date: April 2004
Additional Information: Presented at the 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-15) Nara, JAPAN, July 14-18, 2003
Keywords: magnetization, two-dimensional electron system, quantum Hall effect
Organisations: Nanoelectronics and Nanotechnology


Local EPrints ID: 262116
ISSN: 1386-9477
PURE UUID: 2cab33c8-b7c4-4fd9-856e-91e9dcdd4590

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Date deposited: 23 Mar 2006
Last modified: 18 Jul 2017 08:54

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Author: A. Usher
Author: M. Zhu
Author: A. J. Matthews
Author: A. Potts
Author: M. Elliott
Author: W. G. Herrenden-Harker
Author: D. A. Ritchie
Author: M. Y. Simmons

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