| EPSRC Reference: |
GR/L78017/01 |
| Title: |
MAGNETO-OPTICAL STUDIES OF SINGLE SEMICONDUCTOR QUANTUM DOTS |
| Principal Investigator: |
Mowbray, Professor D |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Physics and Astronomy |
| Organisation: |
University of Sheffield |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 July 1998 |
Ends: |
30 June 2001 |
Value (£): |
80,903
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
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| EPSRC Industrial Sector Classifications: |
| No relevance to Underpinning Sectors |
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| Panel History: |
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Summary on Grant Application Form |
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The aim of the proposed work is to perform a detailed magneto-optical study of single self-organised quantum dots. This will allow the study of fundamental physics in zero-dimensionality semiconductor systems. Single dot studies are necessary to remove the large inhomogeneous broadening present when large numbers of dots are probed by conventional optical systems (spatial resolution ~ 100um). The studies will be performed by using a dedicated experimental system which will allow magneto-optical measurements in fields up to 5T and with a spatial resolution of ~1um. Studies will initially concentrated on the InAs/GaAs self-organised system with later work on the InP/GaInP and InSb/GaAs systems. Topics to be investigated will include many body-effects, carrier relaxation mechanisms, carrier effective masses and g-factors, non-parabolicity effects and dot shape and sizes. The ability to perform magneto-optical measurements on single dots will allow hitherto unavailable information to be obtained in these highly topical areas. In addition studies will be made of related quasi-0D systems formed by quantum well and quantum wire width fluctuations.New abstractThe work carried out under the awarded grant has been concerned with a detailed magneto-optical study of single, self-assembled quantum dots. This has allowed the study of fundamental physics in zero-dimensional semiconductor systems. Single dot studies are necessary to remove the large inhomogeneous broadening present when large numbers of dots are probed by conventional optical systems (spatial resolution ~100um). The studies have been performed using a dedicated experimental system which allows magneto-optical measurements in fields up to 5T and with a spatial resolution of ~1um. Studies have concentrated on the In(Ga)As-(Al)GaAs self-assembled system. Topics investigated include many body-effects (mulitple uncharged excitons and charged excitons and bi-excitons) carrier relaxation mechanisms, carrier effective masses and g-factors, dot shape, size and anisotropies. The application of magneto-optical spectroscopy to single dots has allowed hitherto unavailable information to be obtained in these highly topical areas.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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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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| Date Materialised |
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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.shef.ac.uk |