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We present a bosonic model where spin Meissner currents persist in insulating phases. This work demonstrates novel spin superfluidity in Mott insulators, realizable in Josephson junction arrays and cold atom experiments.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Many-Body Physics

Background:

  • Superfluidity and insulating states are fundamental concepts in condensed matter.
  • Meissner effect is a hallmark of superconductivity, typically associated with charged particles.
  • Understanding exotic phases in interacting bosonic systems is crucial for quantum technologies.

Purpose of the Study:

  • To introduce a generic bosonic model exhibiting persistent (spin) Meissner currents in insulating phases.
  • To explore the separation of charge and spin degrees of freedom in interacting bosons.
  • To investigate novel spin phases and their experimental realization.

Main Methods:

  • Theoretical modeling of two-species interacting bosons on a lattice.
  • Analysis of charge and spin sectors, including Mott insulator and superfluid states.
  • Coupling the spin sector to gauge fields to study the spin Meissner effect.

Main Results:

  • Demonstration of persistent spin Meissner currents in a bosonic Mott insulator.
  • Observation of charge-spin separation with a gapped charge sector and a superfluid spin sector.
  • Identification of other spin phases, including chiral currents and spin-density waves.

Conclusions:

  • The proposed bosonic model provides a platform for realizing spin Meissner effects in insulating phases.
  • The findings open avenues for exploring novel quantum phases in engineered quantum systems.
  • Experimental realization is feasible in Josephson junction arrays and cold atom experiments.