Momentum-Space Josephson Effects

被引：37

作者：

Hou, Junpeng ^{[1
]}

Luo, Xi-Wang ^{[1
]}

Sun, Kuei ^{[1
]}

Bersano, Thomas ^{[2
]}

Gokhroo, Vandna ^{[2
]}

Mossman, Sean ^{[2
]}

Engels, Peter ^{[2
]}

Zhang, Chuanwei ^{[1
]}

机构：

[1] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA

[2] Washington State Univ, Dept Phys & Astron, Pullman, WA 99164 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 12期

基金：

美国国家科学基金会;

关键词：

BOSE-EINSTEIN CONDENSATION; SUPERFLUID HE-3; OSCILLATIONS; GASES;

D O I：

10.1103/PhysRevLett.120.120401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Josephson effect is a prominent phenomenon of quantum supercurrents that has been widely studied in superconductors and superfluids. Typical Josephson junctions consist of two real-space superconductors (superfluids) coupled through a weak tunneling barrier. Here we propose a momentum-space Josephson junction in a spin-orbit coupled Bose-Einstein condensate, where states with two different momenta are coupled through Raman-assisted tunneling. We show that Josephson currents can be induced not only by applying the equivalent of "voltages," but also by tuning tunneling phases. Such tunneling-phase-driven Josephson junctions in momentum space are characterized through both full mean field analysis and a concise two-level model, demonstrating the important role of interactions between atoms. Our scheme provides a platform for experimentally realizing momentum-space Josephson junctions and exploring their applications in quantum-mechanical circuits.

引用

页数：6

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