费米弧是负U心对能级的一种可见表现
Fermi arcs as a visible manifestation of pair level of negative-U centers
摘要：
在这里，我们考虑的可能性，费米弧观察到的ARPES实验结果的价带电子与负U中心（NUC）的相互作用下形成的掺杂下相邻的Cu阳离子对在CuO 2平面。这种相互作用导致了两粒子的杂化和费米围线上能隙的消失。此外，电子向NUC的跃迁导致自由空穴载流子的产生。在正常状态下，只有这些载流子而不是掺杂的感应电荷提供导电。
英文摘要：
Here we consider the possibility that the Fermi arcs observed in ARPES experiments result from interaction of valence band electrons with negative-U centers (NUCs) which are formed under doping on the pairs of neighboring Cu cations in CuO2 plane. This interaction results in two-particle hybridization and vanishing of the gap over the part of Fermi contour. Furthermore the transitions of electrons to NUCs result in the generation of free hole carriers. Just these carriers rather than doping induced charges provide conduction in the normal state.
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