Quantum Phase Fluctuations Responsible for Pseudogap

Abstract

The effect of ordering field phase fluctuations on the normal and superconducting properties of a simple 2D model with a local four-fermion attraction is studied. Neglecting the coupling between the spin and charge degrees of freedom an analytical expression has been obtained for the fermion spectral function as a single integral over a simple function. From this we show that, as the temperature increases through the 2D critical temperature and a nontrivial damping for a phase correlator develops, quantum fluctuations fill the gap in the quasiparticle spectrum. Simultaneously the quasiparticle peaks broaden significantly above the critical temperature, resembling the observed pseudogap behavior in high-T_c superconductors.

5 pages, ReVTeX, 1 EPS figure; final version to appear in Physica C

References in corpus (6)

• The pseudogap in high-temperature superconductors: an experimental survey
• Phase Fluctuations and Pseudogap Phenomena
• Signature of Superfluid Density in the Single-Particle Excitation Spectrum of Bi2Sr2CaCu2O8+delta
• Effective Actions and Phase Fluctuations in d-wave Superconductors
• Nonperturbative XY-model approach to strong coupling superconductivity in two and three dimensions
• Role of symmetry and dimension on pseudogap phenomena

Cited by in corpus (4)

• Antiferromagnetism and single-particle properties in the two-dimensional half-filled Hubbard model: a non-linear sigma model approach
• Berezinskii-Kosterlitz-Thouless transition and BCS-Bose crossover in the two-dimensional attractive Hubbard model
• Transport of Dirac electrons in a random magnetic field in topological heterostructures
• Néel transition, spin fluctuations, and pseudogap in underdoped cuprates by a Lorentz invariant four-fermion model in 2+1 dimensions