COLLECTIVE EXCITATIONS IN SUPERCONDUCTORS AND SEMICONDUCTORS IN THE PRESENCE OF A CONDENSED PHASE

2010 ◽  
Vol 24 (25n26) ◽  
pp. 5179-5191 ◽  
Author(s):  
ZLATKO KOINOV
Keyword(s):  
Hubbard Model ◽  
Condensed Phase ◽  
Correlation Functions ◽  
Light Propagation ◽  
Collective Excitations ◽  
Extended Hubbard Model ◽  
Spin Triplet

We first study the spectrum of the excitonic polaritons in semiconductors in the presence of a condensed phase. With the help of the Hubbard-Stratonovich transformation we propose an exact mapping of the extended Hubbard model onto an excitonic-polariton model describing the light propagation in semiconductors. This approach allows us to derive exact formulas for spin-spin and charge-charge correlation functions for spin-triplet superconductivity.

TWO-DIMENSIONAL QUARTER-FILLED EXTENDED HUBBARD MODEL AT STRONG COUPLING

2005 ◽  
Vol 19 (01n03) ◽  
pp. 213-216
Author(s):  
W. F. LEE ◽  
H. Q. LIN
Keyword(s):  
Hubbard Model ◽  
Correlation Functions ◽  
Nearest Neighbor ◽  
Spin Correlation ◽  
Perturbation Approach ◽  
Effective Hamiltonian ◽  
Two Dimensional ◽  
Extended Hubbard Model ◽  
Neighbor Interaction ◽  
Electron Hopping

In this paper, we generalized the perturbation approach to study the quasi-two-dimension extended Hubbard model. This model is characterizing by intra-chain electron hopping t, on-site Column interaction U, nearest-neighbor interaction V, and inter-chain electron hopping t′ and nearest-neighbor interaction V′. An effective Hamiltonian up to sixth-order in t/U, t/V, t/V′, t′/U, t′/V and t′/V′ expansion was obtained and the spin-spin correlation functions were calculated. We presented results for t=t′, V=V′.

scholarly journals Spin-Triplet Superconductivity Induced by Charge Fluctuations in Extended Hubbard Model

2005 ◽  
Vol 74 (9) ◽  
pp. 2579-2585 ◽  
Author(s):  
Seiichiro Onari ◽  
Ryotaro Arita ◽  
Kazuhiko Kuroki ◽  
Hideo Aoki
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Charge Fluctuations ◽  
Spin Triplet

Entanglement and Correlation Functions in 1D Extended Hubbard Model

2018 ◽  
Vol 7 (3) ◽  
pp. 350-353 ◽  
Author(s):  
S. Harir ◽  
A. Zouhair ◽  
M. Bennai ◽  
Y. Boughaleb
Keyword(s):  
Hubbard Model ◽  
Correlation Functions ◽  
Extended Hubbard Model

Stability ofs+id-Wave Pairing State in the 2-D Extended Hubbard Model

1995 ◽  
Vol 64 (3) ◽  
pp. 922-926 ◽  
Author(s):  
Hiroki Tsuchiura ◽  
Yukio Tanaka ◽  
Yasunari Ushijima
Keyword(s):  
Hubbard Model ◽  
Extended Hubbard Model ◽  
Pairing State ◽  
Wave Pairing
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