Excitonic condensation under spin-orbit coupling and BEC-BCS crossover
PHYSICAL REVIEW LETTERS, cilt.98, sa.16, 2007 (SCI-Expanded)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 98 Sayı: 16
- Basım Tarihi: 2007
- Doi Numarası: 10.1103/physrevlett.98.166405
- Dergi Adı: PHYSICAL REVIEW LETTERS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Abdullah Gül Üniversitesi Adresli: Hayır
Özet
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.