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.
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页数：6
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