Single-Particle Pseudogap in Two-Dimensional Electron Systems

Abstract

We investigate pseudogap phenomena in the 2D electron system. Based on the mode-mode coupling theory of antiferromagnetic (AFM) and $d_{x^2-y^2}$-wave superconducting ($d$SC) fluctuations, single-particle dynamics is analyzed. For the parameter values of underdoped cuprates, pseudogap structure grows in the single-particle spectral weight $A(k,\omega )$ around the wave vector $(\pi ,0)$ and $(0,\pi )$ below the pseudo-spin-gap temperature $\TPG$ signaled by the reduction of dynamical spin correlations in qualitative agreement with the experimental data. The calculated results for the overdoped cuprates also reproduce the absence of the pseudogap in the experiments. We also discuss limitations of our weak-coupling approach.

6 pages with 4 figures, submitted to J. Phys. Soc. Jpn

References in corpus (1)

• d_{x^2-y^2}-Wave Pairing Fluctuations and Pseudo Spin Gap in Two-Dimensional Electron Systems

Cited by in corpus (3)

• Theory of Superconductivity in Strongly Correlated Electron Systems
• Mean-field study of the interplay between antiferromagnetism and d-wave superconductivity
• Revised phase diagram of the high-$T_c$ cuprate superconductor Pb-doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ revealed by anisotropic transport measurements