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arXiv 1503.05997cond-mat.supr-con
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密度与超导量子临界涨落的相互作用

Interplay between density and superconducting quantum critical fluctuations

S. Caprara, N. Bergeal, J. Lesueur, M. Grilli

摘要:

我们考虑的情况下,密度驱动的金属超导体转变的电子相分离附近。特别是,我们调查超导波动和密度波动,成为量子临界时,电子相分离消失在零温度到量子临界点之间的相互作用。在这种情况下,临界动力学密度涨落强烈地影响库珀对涨落的动力学,其获得具有z=3的动力学临界指数的更奇异的特征。这就产生了一种情况,可能规则的超导性消失时,电子密度减少静电门控在LaAlO 3/SrTiO 3界面。

英文摘要:

We consider the case of a density-driven metal-superconductor transition in the proximity of an electronic phase separation. In particular we investigate the interplay between superconducting fluctuations and density fluctuations, which become quantum critical when the electronic phase separation vanishes at zero temperature into a quantum critical point. In this situation the critical dynamical density fluctuations strongly affect the dynamics of the Cooper pair fluctuations, which acquire a more singular character with a z=3 dynamical critical index. This gives rise to a scenario that possibly rules the disappearance of superconductivity when the electron density is reduced by elecrostatic gating at the LaAlO3/SrTiO3 interface.

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