Zeeman-Effect-Induced 0-π Transitions in Ballistic Dirac Semimetal Josephson Junctions

被引：17

作者：

Li, Chuan ^{[1
]}

de Ronde, Bob ^{[1
]}

de Boer, Jorrit ^{[1
]}

Ridderbos, Joost ^{[1
]}

Zwanenburg, Floris ^{[1
]}

Huang, Yingkai ^{[2
]}

Golubov, Alexander ^{[1
,3
]}

Brinkman, Alexander ^{[1
]}

机构：

[1] Univ Twente, MESA, Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[2] Univ Amsterdam, Van der Waals Zeeman Inst, IoP, NL-1098 XH Amsterdam, Netherlands

[3] Moscow Inst Phys & Technol, Dolgoprudnyi 14170, Moscow Region, Russia

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 02期

基金：

欧洲研究理事会;

关键词：

SUPERCONDUCTORS; PROXIMITY;

D O I：

10.1103/PhysRevLett.123.026802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

One of the consequences of Cooper pairs having a finite momentum in the interlayer of a Josephson junction is pi-junction behavior. The finite momentum can either be due to an exchange field in ferromagnetic Josephson junctions, or due to the Zeeman effect. Here, we report the observation of Zeeman-effect-induced 0-pi transitions in Bi1-xSbx, three-dimensional Dirac semimetal-based Josephson junctions. The large in-plane g factor allows tuning of the Josephson junctions from 0 to pi regimes. This is revealed by measuring a pi phase shift in the current-phase relation measured with an asymmetric superconducting quantum interference device (SQUID). Additionally, we directly measure a nonsinusoidal current-phase relation in the asymmetric SQUID, consistent with models for ballistic Josephson transport.

引用

页数：6