Angle-resolved photoemission spectra in one-dimensional Hubbard-Holstein model

NUCLEAR, HEAVY ION AND ATOMIC PHYSICS

Angle-resolved photoemission spectra in one-dimensional Hubbard-Holstein model

SUN Peijian，

HUAI Ping，

ZHANG Wei，

CHENG Cheng，

ZHU Zhiyuan

Nuclear Science and Techniques

Vol.22, No.5

pp.299-303

Published in print 20 Oct 2011

DOI：10.13538/j.1001-8042/nst.22.299-303

30800

In order to understand the effects of electron-phonon coupling and Coulomb interactions in angle-resolved photoemission spectroscopy (ARPES), a spin-1/2 Hubbard-Holstein model at half-filling is theoretically investigated by means of the mean field theory and classical Monte Carlo simulation method. It shows that the spectral shape of the one-dimensional system is significantly modified by the electron-phonon coupling and Coulomb interactions. The suppression of charge-density wave in one-dimensional system has been ascribed to the short-range Coulomb repulsion and thermal lattice fluctuations. The competition between these interactions can induce zero energy gaps in APPES as well as complete cancellation of charge or spin ordering.

ARPESElectron-phonon couplingElectron-electron interactionMonte Carlo simulation

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