Spectral properties and pseudogaps in a model with d-wave pairing symmetry

Article

关键词: ELECTRONIC SPECIFIC-HEAT;    MEAN-FIELD-THEORY;    T-C;    PHASE FLUCTUATIONS;    HUBBARD-MODEL;    FERMI-LIQUID;    NORMAL-STATE;    SUPERCONDUCTING GAP;    2 DIMENSIONS;    TEMPERATURE;   

DOI  :  10.1103/PhysRevB.63.014502

来源: SCIE

【 摘 要 】

A model with d-wave pairing symmetry is studied by employing a nonperturbative sum-rule approach. At low temperature the magnitude of a normal-state pseudogap shows strong (k) over right arrow or angle dependence well fitted by cos 2 phi form. With increasing temperature, the pseudogap closes at some critical angle phi (c), and beyond this angle a single quasiparticlelike peak appears. The resulting Fermi surface is strongly temperature dependent. Both in the spectral function and the density of states, the pseudogap disappears in a manner that the spectral weight fills in the pseudogap instead of closing it with increasing temperature. All these features are qualitatively consistent with angle resolved photoemission spectroscopy for underdoped cuprates.

【 授权许可】

Free