Floquet-Induced Superfluidity with Periodically Modulated Interactions of Two-Species Hardcore Bosons in a One-dimensional Optical Lattice

TL;DR

This paper explores how periodic modulation of interactions in a two-species hardcore boson system in a 1D optical lattice can induce superfluidity, revealing new phases and transitions through combined numerical and analytical methods.

Contribution

It introduces a novel Floquet engineering approach to induce superfluidity and discovers a new gauge-paired superfluid phase in a two-species bosonic system.

Findings

Density-dependent hopping reduction causes Mott-insulator to superfluid transition.

Negative hopping induces a gauge phase leading to a superfluid of gauge-paired particles.

Experimental signatures of these phases are discussed.

Abstract

We consider two species of hard-core bosons with density dependent hopping in a one-dimensional optical lattice, for which we propose experimental realizations using time-periodic driving. The quantum phase diagram for half-integer filling is determined by combining different advanced numerical simulations with analytic calculations. We find that a reduction of the density-dependent hopping induces a Mott-insulator to superfluid transition. For negative hopping a previously unknown state is found, where one species induces a gauge phase of the other species, which leads to a superfluid phase of gauge-paired particles. The corresponding experimental signatures are discussed.