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Luminescence Effects in Quantum Well Structures in Magnetic and Electric Fields

Denev, Sava (2005) Luminescence Effects in Quantum Well Structures in Magnetic and Electric Fields. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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We have performed experimental studies of the exciton dynamics in coupled quantum wells in electric and magnetic fields. Being composed of an electron and a hole, the excitons are Bose particles and there are theoretical predictions that they should undergo Bose-Einstein condensation (BEC). Coupled quantum wells, a two dimensional system due to the quantum confinement, are particularly suitable for studying BEC of excitons due to the ability to extend excitons' lifetime up to several microseconds. We have found that the disorder in the structure plays an important role in the properties of the exciton luminescence under magnetic field. We were also among the first to observe an unique effect---luminescence rings around the excitation spot that can span over distances of millimeters. We found that this effect is extremely dependent on the specific experimental conditions as well as some characteristic properties of the structure, like doping level, that can facilitate charge separation in two dimensions.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Denev, Savasadst37@pitt.eduSADST37
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairSnoke, Davidsnoke@pitt.eduSNOKE
Committee MemberBoyanovsky, Daniel
Committee MemberWaldeck, David
Committee MemberPetek, Hrvoje
Committee MemberDevaty, Robert
Date: 31 January 2005
Date Type: Completion
Defense Date: 22 September 2004
Approval Date: 31 January 2005
Submission Date: 10 December 2004
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: excitons quantum wells BEC luminescence rings magn
Other ID:, etd-12102004-103504
Date Deposited: 10 Nov 2011 20:10
Last Modified: 15 Nov 2016 13:54


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