Ultrathin two-dimensional superconductivity with strong spin-orbit coupling

被引：59

作者：

Nam, Hyoungdo ^{[1
]}

Chen, Hua ^{[1
]}

Liu, Tijiang ^{[2
]}

Kim, Jisun ^{[1
,2
]}

Zhang, Chendong ^{[1
]}

Yong, Jie ^{[3
,5
]}

Lemberger, Thomas R. ^{[3
]}

Kratz, Philip A. ^{[4
]}

Kirtley, John R. ^{[4
]}

Moler, Kathryn ^{[4
]}

Adams, Philip W. ^{[2
]}

MacDonald, Allan H. ^{[1
]}

Shih, Chih-Kang ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[2] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[3] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA

[4] Stanford Univ, Dept Phys & Appl Phys, Stanford, CA 94305 USA

[5] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2016年 / 113卷 / 38期

基金：

美国国家科学基金会;

关键词：

superconductivity; ultrathin film; spin-orbit coupling; Zeeman; Rashba; FILMS; METAL; TRANSITIONS; DENSITY;

D O I：

10.1073/pnas.1611967113

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We report on a study of epitaxially grown ultrathin Pb films that are only a few atoms thick and have parallel critical magnetic fields much higher than the expected limit set by the interaction of electron spins with a magnetic field, that is, the Clogston-Chandrasekhar limit. The epitaxial thin films are classified as dirty-limit superconductors because their mean-free paths, which are limited by surface scattering, are smaller than their superconducting coherence lengths. The uniformity of superconductivity in these thin films is established by comparing scanning tunneling spectroscopy, scanning superconducting quantum interference device (SQUID) magnetometry, double-coil mutual inductance, and magneto-transport, data that provide average superfluid rigidity on length scales covering the range from microscopic to macroscopic. We argue that the survival of superconductivity at Zeeman energies much larger than the superconducting gap can be understood only as the consequence of strong spin-orbit coupling that, together with substrate-induced inversion-symmetry breaking, produces spin splitting in the normal-state energy bands that is much larger than the superconductor's energy gap.

引用

页码：10513 / 10517

页数：5

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