锂修饰单层石墨烯中超导性的证据
超导电性
2016-02-17 v2
摘要
单层石墨烯表现出许多奇特的电子性质,而超导性可以说是其中最引人注目的例外。理论上曾提出,通过用碱金属吸附原子超晶格修饰石墨烯来增强电子-声子耦合,可能会诱导出超导性 [Profeta et al. Nat. Phys. 8, 131-134 (2012)]。虽然实验确实证明了吸附原子引起的电子-声子耦合增强,但从未观察到超导性。利用角分辨光电子能谱 (ARPES),我们展示了在低温下沉积于石墨烯上的锂极大地改变了声子态密度,导致电子-声子耦合增强至 。随后,在石墨烯衍生的 带 Fermi 面的一部分上,我们观察到了一个 meV 的温度依赖配对能隙的打开。据我们所知,这一结果首次表明锂修饰单层石墨烯确实具有超导性,其 。
引用
@article{arxiv.1508.05925,
title = {Evidence for superconductivity in Li-decorated monolayer graphene},
author = {Bart Ludbrook and Giorgio Levy and Pascal Nigge and Marta Zonno and Michael Schneider and David Dvorak and Christian Veenstra and Sergey Zhdanovich and Douglas Wong and Pinder Dosanjh and Carola Straßer and Alexander Stohr and Stiven Forti and Christian Ast and Ulrich Starke and Andrea Damascelli},
journal= {arXiv preprint arXiv:1508.05925},
year = {2016}
}
备注
Accepted. A high-resolution version with supplementary material can be found at http://qmlab.ubc.ca/ARPES/PUBLICATIONS/Articles/Graphene_Li.pdf