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), 741-744.
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Description/Abstract
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.
| Item Type: | Article |
|---|---|
| Additional Information: | Presented at the 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-15) Nara, JAPAN, July 14-18, 2003 |
| ISSNs: | 1386-9477 |
| Keywords: | magnetization, two-dimensional electron system, quantum Hall effect |
| Divisions: | Faculty of Physical and Applied Science > Electronics and Computer Science > NANO |
| Item ID: | 262116 |
| Date Deposited: | 23 Mar 2006 |
| Last Modified: | 18 Aug 2012 04:03 |
| Contributors: | Usher, A. (Author) Zhu, M. (Author) Matthews, A. J. (Author) Potts, A. (Author) Elliott, M. (Author) Herrenden-Harker, W. G. (Author) Ritchie, D. A. (Author) Simmons, M. Y. (Author) |
| 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 |
| Status: | Published |
| Publisher: | Elsevier |
| Further Information: | Google Scholar |
| ISI Citation Count: | 4 |
| URI: | http://eprints.soton.ac.uk/id/eprint/262116 |
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