Chiral odd Chern number lattice supersolidity with tunable unpaired Majorana fermions in a Rydberg-dressed Fermi gas

TL;DR

This paper proposes a novel two-dimensional lattice supersolid state in a Rydberg-dressed Fermi gas that supports tunable chiral Majorana fermions, offering new avenues for topological quantum computation.

Contribution

It introduces a new platform for chiral Majorana fermions using a Rydberg-dressed Fermi gas with tunable interactions and demonstrates the emergence of an odd Chern number lattice supersolid state.

Findings

Confirmed the existence of an odd Chern number lattice supersolid state.

Showed that density modulation can tune the system's topology.

Demonstrated manipulation of Majorana fermions via lattice and interaction tuning.

Abstract

There is growing interest to search the chiral Majorana fermions that could arise as the quasi-particle edge state of a two-dimensional topological state of matter. Here we propose a new platform, i.e., a two-dimensional chiral odd Chern number lattice supersolid state, for supporting multiple number-tunable chiral Majorana fermions from a single component Rydberg-dressed Fermi gas in an optical lattice. The attractiveness of our idea rests on the fact that by introducing the unveiled competition between two distinct length scales, i.e., lattice period and the distance of resonant Rydberg-dressing, can provide a new way to manipulate the spatial dependence of both the strength and sign of the effective Rydberg-dressed interaction. Such a designed effective interaction turns out, can induce an unveiled odd Chern number lattice supersolid state, which is confirmed by both the mean-field and Monte Carlo calculations. Furthermore, we also find that the spontaneously formed density modulation resulted from the discrete translational symmetry breaking provides a natural way of tuning the system's topology arising from the superfluidity induced by the $U(1)$ symmetry breaking. It thus provide an alternative way for manipulating the chiral Majorana fermions, which would be useful in topological quantum computation.