| EPSRC Reference: |
GR/R20311/01 |
| Title: |
On the Theory of Electron-Phonon Interaction In the Quantum Hall Regime |
| Principal Investigator: |
Portnoi, Professor M |
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| Department: |
Physics |
| Organisation: |
University of Exeter |
| Scheme: |
Fast Stream |
| Starts: |
01 February 2001 |
Ends: |
31 January 2003 |
Value (£): |
63,509
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Summary on Grant Application Form |
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The quantum Hall effect (OHE) is one of the most fascinating physical phenomena discovered in the last quarter of the twentieth century. Despite extensive world-wide research in this field there are still many unanswered questions related to both fractional and integer quantum Hall effects. Being an essentially quantum phenomenon, the OHE is observed in two-dimensional systems at extremely low temperatures and high magnetic fields. However, there are several natural (yet unanswered) questions: When and why does the OHE disappear with (a) increasing temperature, (b) decreasing magnetic field and (c) increasing width of the quasi two-dimensional electron layer? The electron-phonon interaction, which is usually suppressed in the quantum Hall regime, becomes significant under conditions (a), (b) and (c). We intend to study several problems related to electron-phonon interaction in the OHE regime, such as the nature of the dissipative conductivity when the electron-phonon interaction is increased by the presence of additional size-quantized subbands, the role of phonons in the linewidth of the magnetoexciton photoluminescence, the contribution of the multiple-phonon scattering to the dissipative conductivity and the phonon-assisted breakdown of the OHE in a strong electric field. Different mechanisms of the electron-phonon interaction will be considered and the prevalent one will be found.
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Key Findings |
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Potential use in non-academic contexts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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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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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.ex.ac.uk |