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Momentum-Space Josephson Effects.

Junpeng Hou1, Xi-Wang Luo1, Kuei Sun1

  • 1Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080-3021, USA.

Physical Review Letters
|April 26, 2018
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Summary
This summary is machine-generated.

Researchers created a novel momentum-space Josephson junction in Bose-Einstein condensates. This quantum effect allows Josephson currents to be controlled by tuning tunneling phases, opening new avenues for quantum circuits.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomic physics

Background:

  • The Josephson effect describes quantum supercurrents in superconductors and superfluids.
  • Conventional Josephson junctions couple real-space superconductors via a tunneling barrier.

Purpose of the Study:

  • To propose and characterize a momentum-space Josephson junction.
  • To explore novel methods for inducing Josephson currents in quantum systems.

Main Methods:

  • Utilizing a spin-orbit coupled Bose-Einstein condensate.
  • Employing Raman-assisted tunneling to couple momentum states.
  • Conducting full mean-field analysis and a two-level model.

Main Results:

  • Demonstrated Josephson currents induced by "voltages" and tunneling phase tuning.
  • Highlighted the significant role of interatomic interactions.
  • Characterized the momentum-space Josephson junction behavior.

Conclusions:

  • The proposed scheme enables experimental realization of momentum-space Josephson junctions.
  • This work offers a platform for exploring quantum-mechanical circuits with novel control mechanisms.