Momentum-Space Josephson Effects
Abstract
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 diffferent 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.
Cite
@article{arxiv.1710.06369,
title = {Momentum-Space Josephson Effects},
author = {Junpeng Hou and Xi-Wang Luo and Kuei Sun and Thomas Bersano and Vandna Gokhroo and Sean Mossman and Peter Engels and Chuanwei Zhang},
journal= {arXiv preprint arXiv:1710.06369},
year = {2018}
}
Comments
10 pages, 7 figures