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Non-equilibrium 8π Josephson effect in atomic Kitaev wires.

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Researchers identified a new signature for Majorana quasi-particles in cold atom systems. This discovery reveals an 8π periodicity in Josephson currents, offering an alternative experimental approach to detecting exotic quantum states.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Atomic Physics

Background:

  • Exotic quantum states of matter are sought after, with Majorana quasi-particles as key indicators.
  • Proving Majorana quasi-particles' non-Abelian statistics via braiding is experimentally challenging.
  • Alternative detection methods for Majorana quasi-particles are needed.

Purpose of the Study:

  • To identify an experimentally accessible signature of Majorana quasi-particles.
  • To explore a novel non-equilibrium Josephson effect in cold atom systems.
  • To investigate the impact of dephasing and particle loss on this signature.

Main Methods:

  • Utilizing alkaline-earth-like atoms in a cold atom system.
  • Studying a modified Kitaev wire model with an additional site.
  • Analyzing the super-exchange coupling between Majorana-bound states.
  • Investigating the Josephson current's periodicity and its dependence on system parameters.

Main Results:

  • A tunable, non-equilibrium Josephson effect was observed.
  • An 8π periodicity in the Josephson current was identified, distinct from conventional superconductors.
  • The influence of dephasing and particle losses on the 8π periodicity was analyzed.

Conclusions:

  • The 8π Josephson current periodicity serves as a detectable signature for Majorana quasi-particles.
  • Cold atom systems offer a promising platform for experimentally probing Majorana quasi-particles.
  • This work provides a new avenue for exploring exotic quantum matter beyond traditional braiding techniques.