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Interaction of excitons in two-dimensional potentials

Voros, Zoltan (2008) Interaction of excitons in two-dimensional potentials. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

In the present thesis we discuss experimental work related to the Bose-Einstein condensation (BEC) of bound electron-hole pairs (excitons) in GaAs coupled quantum wells. Coupled quantum wells were chosen because in these structures the lifetime of excitons can be extended to the $mu$s range. In the experiments, by measuring their diffusion, we have proved that excitons can move freely in two dimensions, and we have proved that they can reach thermal equilibrium during their lifetime in a confining stress potential in the plane of the quantum wells. Having an equilibrium ensemble of these quasi-particles enabled us to measure their interaction potential in a controlled environment. We also introduce a simple theoretical model that accounts for the experimental findings on interaction. In the final chapter we discuss a new phenomenon at high stress, and evaluate its possible relation to excitonic BEC.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Voros, Zoltanzvoros@uibk.ac.at
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairSnoke, Davidsnoke@pitt.eduSNOKE
Committee MemberWaldeck, Daviddave@pitt.eduDAVE
Committee MemberLevy, Jeremyjlevy@pitt.eduJLEVY
Committee MemberDevaty, Robertdevaty@pitt.eduDEVATY
Committee MemberLiu, Vincentwvliu@pitt.eduWVLIU
Date: 5 November 2008
Date Type: Completion
Defense Date: 6 June 2008
Approval Date: 5 November 2008
Submission Date: 7 August 2008
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: exciton mobility; exciton trapping; excitonic BEC; quantum well exciton
Other ID: http://etd.library.pitt.edu/ETD/available/etd-08072008-100718/, etd-08072008-100718
Date Deposited: 10 Nov 2011 19:57
Last Modified: 15 Nov 2016 13:48
URI: http://d-scholarship.pitt.edu/id/eprint/8967

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