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The anharmonic electron-phonon problem

J. K. Freericks·Mark Jarrell·G. D. Mahan
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Abstract

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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J. K. Freericks, Mark Jarrell, G. D. Mahan. 1996-05-17. The anharmonic electron-phonon problem. https://doi.org/10.1103/physrevlett.77.4588

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