Excitonic condensation under spin-orbit coupling and BEC-BCS crossover
Author
Hakioǧlu T.
Şahin, M.
Date
2007Source Title
Physical Review Letters
Print ISSN
0031-9007
Publisher
The American Physical Society
Volume
98
Issue
16
Pages
166405-1 - 166405-4
Language
English
Type
ArticleItem Usage Stats
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Abstract
The condensation of electron-hole pairs is studied at zero temperature and in the presence of a weak spin-orbit coupling (SOC) in coupled quantum wells. Under realistic conditions, a perturbative SOC can have observable effects in the order parameter of the condensate. First, the fermion exchange symmetry is absent. As a result, the condensate spin has no definite parity. Additionally, the excitonic SOC breaks the rotational symmetry yielding a complex order parameter in an unconventional way; i.e., the phase pattern of the order parameter is a function of the condensate density. This is manifested through finite off-diagonal components of the static spin susceptibility, suggesting a new experimental method to confirm an excitonic condensate.
Keywords
Carrier concentrationCondensation
Excitons
Fermions
Ion exchange
Excitonic condensation
Fermion exchange
Phase pattern
Spin orbit coupling (SOC)
Spin dynamics