Unconventional pairing in bipolaronic theories

Details Unconventional pairing in bipolaronic theories Unconventional pairing in bipolaronic theories

2006-06-28

arxiv.org/abs/cond-mat/0606719v1

Physica C 460-462 (2007) 1121-1122

Physics

Condensed Matter

Superconductivity

Submitted to M2S-HTSC VIII, Dresden 2006, 2 pages

Scientific paper

10.1016/j.physc.2007.03.234

Various mechanisms have been put forward for cuprate superconductivity, which fit largely into two camps: spin-fluctuation and electron-phonon (el-ph) mechanisms. However, in spite of a large effort, electron-phonon interactions are not fully understood away from clearly defined limits. To this end, we use a numerically exact algorithm to simulate the binding of bipolarons. We present the results of a continuous-time quantum Monte-Carlo (CTQMC) algorithm on a tight-binding lattice, for bipolarons with arbitrary interaction range in the presence of strong coulomb repulsion. The algorithm is sufficiently efficient that we can discuss properties of bipolarons with various pairing symmetries. We investigate the effective mass and binding energies of singlet and triplet real-space bipolarons for the first time, and discuss the extensions necessary to investigate $d$-symmetric pairs.

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