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arXiv 2009.01007cond-mat.supr-con
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石墨烯中玻色-爱因斯坦凝聚体介导的超导电性

Bose-Einstein condensate-mediated superconductivity in graphene

M. Sun, A. V. Parafilo, K. H. A. Villegas, V. M. Kovalev, I. G. Savenko

摘要:

我们提出了一种机制,在石墨烯放置在附近的玻色-爱因斯坦凝聚体的强大的BCS类超导性。石墨烯中的电子与凝聚体上方的激发相互作用,称为Bogoliubov准粒子(或bogolons)。事实证明,玻色子对介导的相互作用使我们能够超越长期存在的问题,即具有线性光谱的粒子的态密度消失。这导致石墨烯的超导性质的显著增强,同时保持其相对论色散。我们研究了超导能隙的行为,并计算了单玻色子和玻色子对介导的配对过程的情况下的临界温度,解释了石墨烯复杂的能带结构。我们还比较了超导转变的临界温度和BKT温度。

英文摘要:

We propose a mechanism for robust BCS-like superconductivity in graphene placed in the vicinity of a Bose-Einstein condensate. Electrons in the graphene interact with the excitations above the condensate, called Bogoliubov quasiparticles (or bogolons). It turns out that bogolon-pair-mediated interaction allows us to surpass the long-standing problem of the vanishing density of states of particles with a linear spectrum. This results in a dramatic enhancement of the superconducting properties of graphene while keeping its relativistic dispersion. We study the behavior of the superconducting gap and calculate critical temperatures in cases with single-bogolon and bogolon-pair-mediated pairing processes, accounting for the complex band structure of graphene. We also compare the critical temperature of the superconducting transition with the BKT temperature.

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。

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