| EPSRC Reference: |
GR/T27907/01 |
| Title: |
Spin-polarised electron gases in semi-magnetic quantum wells |
| Principal Investigator: |
Richards, Professor D |
| Other Investigators: |
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| Project Partners: |
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| Department: |
Physics |
| Organisation: |
Kings College London |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
16 March 2005 |
Ends: |
15 July 2007 |
Value (£): |
113,870
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| EPSRC Research Topic Classifications: |
| Condensed Matter Physics |
Materials Characterisation |
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Summary on Grant Application Form |
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This project combines the physics of two-dimensional electron gases (a very active field in recent years) with the physics of spin and magnetism in semiconductors, currently one of the most topical fields in condensed matter physics. It aims both to have a fundamental impact and to be of relevance to the growing field of spintronics .The programme will be concerned with the study of the two-dimensional electron gas (2DEG) confined in n-type modulation-doped semi-magnetic Cd(Mn)Te quantum well structures. Angle-resolved resonant Raman spectroscopy will allow the measurement of the dispersions of the electronic excitations (plasmons, spin-density and single-particle excitations) in these systems, in combination with a theoretical investigation, using random phase approximations modfied to account for exchange-correlation. Application of a magnetic field leads to the formation of a spin-polarised 2DEG, enabling a detailed spectroscopic study of this model system and allowing, in combination with theory, a new handle on exchange-correlation interactions. Angle-resolved Raman measurements also allow in-plane wavevector to be used as a probe of localisation length-scales, with the Mn concentration used to control the level of alloy disorder. Raman measurements of intrasubband excitations will allow the determination of, e.g., electron density and lifetime, not easily determined with conventional techniques for II-VI systems because of the difficulty of making electrical contacts in these materials. The majority of experimental work will be performed with Dr B Jusserand in the CNRS LPN laboratory in Paris, who has extensive experience of such work and where there is the experimental apparatus necessary to achieve the project objectives. Measurements requiring higher magnetic fields and a flexible sample geometry, and when access to very low energy excitations is not essential, will be performed in the University of Bath.
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Key Findings |
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Potential use in non-academic contexts |
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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