Superconductivity and Charge-Density Wave Phase in the Holstein Model: a Weak Coupling Limit |
| P. Grzybowski and R. Micnas
Solid State Theory Division, Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
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| Received: 14 09 2006; |
| The variational canonical transformation method has been applied to the Holstein model to obtain an effective polaronic Hamiltonian, which is subsequently analyzed in the limit of a weak effective electron-electron interaction. A competition between the superconducting and charge-density wave phases has been studied in the light of strong polaronic effects. The phase diagrams illustrating the system evolution from adiabatic to anti-adiabatic limit are presented. |
| DOI: 10.12693/APhysPolA.111.453 PACS numbers: 71.38.-k, 71.45.Lr, 74.20.Mn |