- Tytuł:
- Two-Band Model for Coherent Excitonic Condensates
- Autorzy:
-
Apinyan, V.
Kopeć, T. - Powiązania:
- https://bibliotekanauki.pl/articles/1398643.pdf
- Data publikacji:
- 2016-08
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
71.10.Fd
71.28.+d
71.35.-y
71.10.Hf - Opis:
- We consider the excitonic correlations in the two-band solid state system composed of the valence band and conduction band electrons. We treat the phase coherence mechanism in the system by presenting the electron operator as a fermion attached to the U(1) phase-flux tube. The emergent bosonic gauge field, related to the phase variables appears to be crucial for the coherent Bose-Einstein condensation of excitons. We calculate the normal excitonic Green functions, and the single-particle density of states functions being a convolution between bosonic and fermionic counterparts. We obtain the total density of states as a sum of two independent parts. For the coherent normal fermionic density of states, there is no hybridization-gap found in the system due to strong coherence effects and phase stiffness.
- Źródło:
-
Acta Physica Polonica A; 2016, 130, 2; 621-624
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki