Electrical Conductivity through a Single Atomic Step Measured with the Proximity-Induced Superconducting Pair Correlation

被引：26

作者：

Kim, Howon ^{[1
,4
]}

Lin, Shi-Zeng ^{[2
]}

Graf, Matthias J. ^{[2
,5
]}

Miyata, Yoshinori ^{[1
]}

Nagai, Yuki ^{[3
]}

Kato, Takeo ^{[1
]}

Hasegawa, Yukio ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, 5-1-5 Kashiwa No Ha, Kashiwa, Chiba 2778581, Japan

[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[3] Japan Atom Energy Agcy, CCSE, Kashiwa, Chiba 2778587, Japan

[4] Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany

[5] US DOE, Off Sci, Washington, DC 20585 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 11期

关键词：

MAJORANA FERMIONS; PB;

D O I：

10.1103/PhysRevLett.117.116802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Local disordered nanostructures in an atomically thick metallic layer on a semiconducting substrate play significant and decisive roles in transport properties of two-dimensional (2D) conductive systems. We measured the electrical conductivity through a step of monoatomic height in a truly microscopic manner by using as a signal the superconducting pair correlation induced by the proximity effect. The transport property across a step of a one-monolayer Pb surface metallic phase, formed on a Si(111) substrate, was evaluated by inducing the pair correlation around the local defect and measuring its response, i.e., the reduced density of states at the Fermi energy using scanning tunneling microscopy. We found that the step resistance has a significant contribution to the total resistance on a nominally flat surface. Our study also revealed that steps in the 2D metallic layer terminate the propagation of the pair correlation. Superconductivity is enhanced between the first surface step and the superconductor-normal-metal interface by reflectionless tunneling when the step is located within a coherence length.

引用

页数：5

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