Thermal and Quantum Fluctuations Induced Additional Gap in Single-particle Spectrum of d-p model - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: The possibility of thermal and quantum fluctuations induced attractiveinteraction leading to a pairing gap \Delta tq in the single-particle spectrumof d-p model in the limit of a large N of fermion flavor is investigatedanalytically. This is an anomalous pairing gap in addition to the one withd-wave symmetry originating from partially screened, inter-site coulombinteraction. The motivation was to search for a hierarchy of multiple many-bodyinteraction scales in high-Tc superconductor as suggested by recentexperimental findings. The pairing gap anisotropy stems from more than onesources, namely, nearest neighbour hoppings and the p-d hybridization but notthe coupling of the effective interaction. The temperature at which \Delta tqvanishes may be driven to zero by using a tuning parameter to have access toquantum criticality only when N >> 1. For the physical case N = 2, the usualcoherent quasi-particle feature surfaces in the spectral weight everywhere inthe momentum space below the pairing gap \Delta tq. Thus it appears that thereduction in spin degeneracy has the effect of masking quantum criticality.



Autor: Partha Goswami

Fuente: https://arxiv.org/







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