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Seminars & Lectures

* TITLE

Fundamental Symmetries and Spin Dependence Exciton Condensate in Coupled Double Quantum Wells

* SPEAKERS

Name	Affiliation	E-mail
Prof. Tugrul Hakioğlu	Bilkent Univ. / ITAP, Turkey	sec(at)apctp.org

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2010-03-08, 10:30am

* PLACE

512 Seminar Room, APCTP Headquarters, Pohang

* ABSTRACT

Exciton Condensates in electron-hole bilayers have unconventional properties compared to more conventional ones like BCS condensates. We investigate the lack of fermion exchange symmetry, the time reversal symmetry and the spin rotation symmetry in detail to show that the exciton condensate in double quantum wells is spin dependent. The spin dependence is a result of the radiative recombination and creation of exciton pairs affected by the tunelling between the layers. The dark condensate dominates the ground state whereas the bright one-which couples to light- is dominant in the higher energies. It is also shown that, the spin- orbit coupling of both Rashba and Dresselhaus types increase the role of the bright condensate in the ground state. This theoretical
finding should be available for experimentalists who can only probe the bright contribution in photo luminescence spectroscopy to find evidence for exciton condensation.

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