Particle–Hole Asymmetry and the Pseudogap Phase of the High-TC Superconductors

被引:0
作者
H.-B. Yang
J. D. Rameau
P. D. Johnson
G. D. Gu
机构
[1] Brookhaven National Laboratory,Condensed Matter Physics and Material Science Department
来源
Journal of Superconductivity and Novel Magnetism | 2010年 / 23卷
关键词
High-; superconductor; Angle-resolved photoemission spectroscopy; Pseudogap phase; Particle–hole asymmetry; Fermi surface;
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摘要
In the pseudogap phase of the copper oxide superconductors, a significant portion of the Fermi surface is still gapped at temperatures above the superconducting transition temperature TC. Instead of a closed Fermi surface, the low-energy electronic excitations appear to form unconnected Fermi arcs separated by gapped regions. It is generally believed that the spectral function is particle–hole symmetric (at low energies) in both regions—with a peak at the Fermi level on the Fermi arcs and a local minimum at the Fermi level in the gapped regions. Here, using high resolution angle-resolved photoemission and new techniques of analysis, we show that on a sizable portion of the Fermi surface, the electronic structure in the immediate vicinity of the Fermi level is not particle–hole symmetric in the pseudogap phase. This is clear evidence that an alternative ground state competes with the superconductivity. The observations are also consistent with the possibility that the Fermi arcs are, in fact, the inner surface of the predicted Fermi pockets.
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页码:803 / 806
页数:3
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