期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 17, 页码 3692-3695出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.3692
关键词
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Motivated by recent experimental measurements of the tunneling characteristics of high T-c materials using scanning tunneling spectroscopy, we have calculated the I-V and differential conductance curves in the superconducting state at zero temperature. Comparing BCS-like d-wave pairing and the SU(2) slave-boson approach, we find that the slave-boson model can explain the asymmetric background observed in experiments. The slave-boson model also predicts that the height of the conductance peak relative to the background is proportional to the hole doping concentration x, at least for underdoped samples. We also observe the absence of the van Hove singularity, and comment on possible implications.
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