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Thermal and quantum fluctuations induced additional gap in single-particle spectrum of d-p model

机译：热和量子涨落在d-p模型的单粒子光谱中引起额外的间隙

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The possibility of thermal and quantum fluctuations induced attractive interaction leading to a pairing gap Delta(tq) in the single-particle spectrum of d-p model in the limit of a large N of fermion flavor is investigated analytically. This is an anomalous pairing gap in addition to the one with d-wave symmetry originating from partially screened, inter-site coulomb interaction. The motivation was to search for a hierarchy of multiple many-body interaction scales in high-T-c superconductor as suggested by recent experimental findings. The pairing gap anisotropy stems from more than one source, namely, nearest neighbor hoppings and the p-d hybridization, but not the coupling of the effective interaction. The temperature at which Delta(tq) vanishes may be driven to zero by using a tuning parameter to have access to quantum criticality (QC) only when N 1. For the physical case N = 2, the usual coherent quasi-particle feature surfaces in the spectral weight everywhere in the momentum below the pairing gap Delta(tq). Thus it appears that the reduction in spin degeneracy has the effect of masking quantum criticality. (C) 2008 Elsevier B.V. All rights reserved.
机译：分析研究了热和量子涨落引起吸引力相互作用导致d-p模型单粒子光谱中配对间隙Delta（tq）处于大N费米子味的极限的可能性。除了部分屏蔽的站点间库仑相互作用产生的d波对称性之外，这是一个异常的配对间隙。动机是根据最近的实验发现，在高T-c超导体中寻找多个多体相互作用尺度的层次。配对间隙各向异性源于一个以上的来源，即最邻近的跳跃和p-d杂交，但不是有效相互作用的耦合。仅当N 1时，才可以使用调整参数将Delta（tq）消失的温度驱动为零，以便获得量子临界（QC）。对于物理情况N = 2，通常的相干准粒子特征在配对间隙Delta（tq）以下的动量中，频谱权重中的所有表面都位于表面。因此，看来自旋简并性的降低具有掩盖量子临界性的作用。 （C）2008 Elsevier B.V.保留所有权利。

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