Bosonic Mott Insulator with Meissner Currents

Alexandru Petrescu; Karyn Le Hur

doi:10.1103/physrevlett.111.150601

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arXiv · 1306.5986

Bosonic Mott Insulator with Meissner Currents

Alexandru Petrescu·Karyn Le Hur

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Abstract

We introduce a generic bosonic model exemplifying that (spin) Meissner currents can persist in insulating phases of matter. We consider two species of interacting bosons on a lattice. Our model exhibits separation of charge (total density) and spin (relative density): The charge sector is gapped in a bosonic Mott insulator phase with total density one, while the spin sector remains superfluid due to interspecies conversion. Coupling the spin sector to the gauge fields yields a spin Meissner effect reflecting the long-range spin superfluid coherence. We investigate the resulting phase diagram and describe other possible spin phases of matter in the Mott regime possessing chiral currents as well as a spin-density wave phase. The model presented here is realizable in Josephson junction arrays and in cold atom experiments.

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Alexandru Petrescu, Karyn Le Hur. 2013-06-25. Bosonic Mott Insulator with Meissner Currents. https://doi.org/10.1103/physrevlett.111.150601

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