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- W37942555 abstract "We present an alternative mechanism for the excitonic Bose Einstein condensation (BEC) in the three dimensional electronic system. The quantum physics of the effective cold bosons formed from the electrons and holes is explored using the phase coherence mechanism. We proposed a microscopic description of the exciton condensation in a three dimensional (3D) system in terms of the effective actions. The path integral formalism is applied for the electronic system and the equation for the excitonic order parameter is obtained. We derive the excitonic insulator (EI) state and the excitonic pair (EP) formation critical temperature in a self-consistent way and we solve the equations numerically. In order to consider the non-local pair correlations, we evaluate the series of the cumulant expansion of the effective fermionic action and we consider the second order term with respect to the interband hopping amplitude $tilde{t}$. We obtain the analytical expression for the phase coupling parameter and we evaluate it numerically. A new emergent critical temperature for the excitonic BEC is derived within the proposed calculation scheme and it is found to be mush smaller than usually admitted EP transition temperature. Excitonic correlation functions are discussed and the BEC transition amplitude is derived numerically for different values of the Coulomb interaction parameter. Analytical expression of the excitonic spectral function is given and the shapes of excitonic density of states (DOS) are presented." @default.
- W37942555 created "2016-06-24" @default.
- W37942555 creator A5034367926 @default.
- W37942555 date "2013-11-07" @default.
- W37942555 modified "2023-09-27" @default.
- W37942555 title "Non-local-cross-correlations and macroscopic phase coherence in excitonic systems" @default.
- W37942555 hasPublicationYear "2013" @default.
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