Chiral current reversal induced by a quadratic field in the three-leg magnetic lattice

Abstract

We study the chiral current of non-interacting bosons in a three-leg lattice subjected to a uniform magnetic flux. The model is equivalent to a spin-1 bosonic lattice with three internal degrees of freedom or a one-dimensional lattice with a three-site synthetic dimension. By manipulating a bias field between the legs which acts as a quadratic Zeeman shift, we can effectively reverse the chiral current on the lattice. The current can also be reversed by increasing the magnetic flux or the inter-leg hopping coefficients, provided that the quadratic field is applied. Three types of current reversal, either related or unrelated to the Meissner-vortex phase transition, are revealed.

Band topology and Bloch oscillation in an extended Creutz ladder

“…The high level of controllability of lattice parameters, as well as the single-site resolved detection techniques [34,35] are also benefit to simulating the dynamics of quantum systems [25][26][27][36][37][38][39], especially in the low-dimensional limit. Recently, diverse lattice settings have received much attentions, including two-and three-leg ladders [26,27,32,[40][41][42][43][44][45][46]. These legs can be regarded as spin degree of freedom.…”