Rotational bosonic current in a quasi-condensate confined in an optical toroidal trap

TL;DR

This paper explores how to induce and analyze stable rotational bosonic currents in a quasi-one-dimensional condensate confined within an optical toroidal trap, providing a method to differentiate between quasi and true condensates.

Contribution

It introduces a scheme to generate and assess stable rotational currents in a quasi-condensate, highlighting their dependence on symmetry and excitation modes.

Findings

Rotational currents are uniform under preserved circular symmetry.

Such currents are energetically stable when excitation modes are one-dimensional.

The method can distinguish between quasi and true condensates via rotational spectra.

Abstract

We investigate the possibility of inducing a bosonic current which is rotational in a pseudo 1D quasi-condensate confined in an optical toroidal trap. The stability of such a current is also analyzed using hydrodynamics approach. We find that such a current is uniform when the circular symmetry is preserved and energetically stable when the modes of elementary excitations are restricted to one dimension. This scheme allows to distinguish between a quasi and a true condensate by measuring the rotational spectra of the sample.