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dc.contributor.advisorTanatar, Bilal
dc.contributor.authorGüven, Kaan
dc.date.accessioned2016-01-08T20:20:47Z
dc.date.available2016-01-08T20:20:47Z
dc.date.issued1999
dc.identifier.urihttp://hdl.handle.net/11693/18601
dc.descriptionAnkara : the Department of Physics and the Institute of Engineering and Science of Bilkent Unv., 1999.en_US
dc.descriptionThesis (Ph. D.) -- -Bilkent University, 1999.en_US
dc.descriptionIncludes bibliographical references leaves 52-59.en_US
dc.description.abstractThe work in this thesis concerns rnany-body interaction effects in a quasi-onedimensional electron-hole plasma, which may be generated under intense photoexcitation in a semiconductor quantum-well wire. In particular, we investigate how these interactions affect the optical properties of the semiconductor quantum wire. We address this question in two parts: First, the band-gap renormalization (BGR) induced by self-energy corrections of electrons and holes is studied. A two subband model arising from the confinement of the quantum wire is developed to include the multisubband effects. The many-body theoretical formalism of electron (hole) self-energy is given within the GW approximation. We use the dielectric function both in full dynamical random-phase approximation, and in cjuasi-static approximation, in order to emphasize the dynamical properties of screening. The dependence of BGR on the e — h plasma density, temperature and wire width is studied. In the second part, the exciton renormalization induced by e — h plasma screening, and Goulomb correlation effects on the optical spectra of a quantum wire are considered. The optical properties are directly associated with the e — h two particle propogator, which obeys the Bethe-Salpeter equation. Based on recent studies, we review the solution of this equation with screened Coulomb interaction. In particular it is shown* that the dynamical treatment of screening produces an optical absorption/luminescence spectra which is consistent with experimental results. We present a discussion on the interplay of excitons and unbound carriers and on the reflection of this interplay to the optical spectra.en_US
dc.description.statementofresponsibilityGüven, Kaanen_US
dc.format.extentix, 59 leavesen_US
dc.language.isoen_USen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectQuasi-one-dimensional dimensional electron-hole plasmaen_US
dc.subjectselfenergyen_US
dc.subjectband-gap renormalizationen_US
dc.subjectband-gap renormalizationen_US
dc.subjectrandom-phase approximationen_US
dc.subject.lccQC176.8.E4 G88 1999en_US
dc.subject.lcshOne-dimensional conductors.en_US
dc.subject.lcshT-matrix.en_US
dc.subject.lcshSuperconductivity.en_US
dc.titleMany-body interaction effects in quasi-one-dimensional photo-excited electron-hole systemsen_US
dc.typeThesisen_US
dc.departmentDepartment of Physicsen_US
dc.publisherBilkent Universityen_US
dc.description.degreePh.D.en_US


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