期刊
PHYSICAL REVIEW LETTERS
卷 120, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.120401
关键词
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资金
- Air Force Office of Scientific Research [FA9550-16-1-0387]
- National Science Foundation [PHY-1505496, PHY-1607495]
- Army Research Office [W911NF-17-1-0128]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1607495, 1505496] Funding Source: National Science Foundation
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.
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