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- W2109997393 abstract "We analyze the evolution from the weak coupling (BCS-like limit) to the strong coupling limit of tightly bound local pairs (LP's) in the 2D asymmetric attractive Hubbard model, in the presence of the Zeeman magnetic field ($h$). The broken symmetry Hartree approximation is used. We also apply the Kosterlitz-Thouless (KT) scenario to determine the phase coherence temperatures. We obtain that for the spin dependent hopping integrals ($t^{uparrow}neq t^{downarrow}$) the homogeneous polarized superfluid (SC$_M$) phase in the ground state for the strong attraction and lower filling can be stabilized. We find a topological quantum phase transition (Lifshitz type) from the unpolarized superfluid phase (SC$_0$) to SC$_M$ and tricritical point in the ($h-mu$) and spin polarization ($P$) vs. attraction ($U<0$) ground state phase diagrams. The finite temperatures phase diagrams for $t^{uparrow}neq t^{downarrow}$ are constructed." @default.
- W2109997393 created "2016-06-24" @default.
- W2109997393 creator A5069107161 @default.
- W2109997393 date "2013-09-25" @default.
- W2109997393 modified "2023-09-27" @default.
- W2109997393 title "On the BCS-BEC crossover in the 2D Asymmetric Attractive Hubbard Model" @default.
- W2109997393 hasPublicationYear "2013" @default.
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