Excitonic condensation under spin-orbit coupling and BEC-BCS crossover


Creative Commons License

HAKIOGLU T., Sahin M.

PHYSICAL REVIEW LETTERS, cilt.98, sa.16, 2007 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 98 Konu: 16
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1103/physrevlett.98.166405
  • Dergi Adı: PHYSICAL REVIEW LETTERS

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.