Single-Particle Pseudogap in Two-Dimensional Electron Systems

Details Single-Particle Pseudogap in Two-Dimensional Electron Systems Single-Particle Pseudogap in Two-Dimensional Electron Systems

1999-08-13

arxiv.org/abs/cond-mat/9908195v1

J. Phys. Soc. Jpn. 69 (2000) 312.

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1143/JPSJ.69.312

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.

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