The anharmonic electron-phonon problem

Details The anharmonic electron-phonon problem The anharmonic electron-phonon problem

1996-05-17

arxiv.org/abs/cond-mat/9605109v1

Physics

Condensed Matter

5 pages typeset in ReVTeX. Four encapsulated postscript files included

Scientific paper

10.1103/PhysRevLett.77.4588

The anharmonic electron-phonon problem is solved in the infinite-dimensional limit using quantum Monte Carlo simulation. Charge-density-wave order is seen to remain at half filling even though the anharmonicity removes the particle-hole symmetry (and hence the nesting instability) of the model. Superconductivity is strongly favored away from half filling (relative to the charge-density-wave order) but the anharmonicity does not enhance transition temperatures over the maximal values found in the harmonic limit.

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