arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1004.4346cond-mat.supr-con
收藏

与扩散金属电容耦合的超导导线中的耗散相位涨落

Dissipative phase-fluctuations in superconducting wires capacitively coupled to diffusive metals

Alejandro M. Lobos, Thierry Giamarchi

摘要:

我们研究了准一维超导体中存在一维或二维非相互作用电子气时库仑相互作用的屏蔽。为此,我们导出了一个有效的低能相位作用量,它相当于在随机相位近似下处理库仑关联和超导关联。我们集中在超导体中的耗散效应的研究,诱导的库仑耦合的影响在金属中的扩散密度模式,并研究其后果的静态和动态电导率。我们的研究结果指向屏蔽金属的维度的重要性,在低能量的超导等离子体模式的导线的行为。在没有拓扑缺陷的情况下,并且当屏蔽由一维电子气给出时,超导等离子体模式在极限$q\to 0$中被完全阻尼,并且因此在导线中失去超导性。与此相反,我们恢复德鲁德响应的电导率时,屏蔽是由二维电子气提供的。

英文摘要:

We study the screening of the Coulomb interaction in a quasi one-dimensional superconductor given by the presence of either a one- or a two-dimensional non-interacting electron gas. To that end, we derive an effective low-energy phase-only action, which amounts to treating the Coulomb and superconducting correlations in the random-phase approximation. We concentrate on the study of dissipation effects in the superconductor, induced by the effect of Coulomb coupling to the diffusive density-modes in the metal, and study its consequences on the static and dynamic conductivity. Our results point towards the importance of the dimensionality of the screening metal in the behavior of the superconducting plasma mode of the wire at low energies. In absence of topological defects, and when the screening is given by a one-dimensional electron gas, the superconducting plasma mode is completely damped in the limit $q\to 0$, and consequently superconductivity is lost in the wire. In contrast, we recover a Drude-response in the conductivity when the screening is provided by a two-dimensional electron gas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑