Chiral d-wave superfluid in periodically driven lattices

TL;DR

This paper proposes a novel method to realize chiral d-wave superfluids in 2D lattices using periodic driving, enabling exploration of topological phase transitions driven by controllable parameters.

Contribution

It introduces a new scheme to generate chiral d-wave superfluids via periodic driving and pseudospin-orbit coupling, facilitating experimental realization and study of topological phase transitions.

Findings

Proposes a periodic driving scheme to create chiral d-wave superfluids.

Demonstrates control over phase transitions between s- and d-wave superfluids.

Provides a pathway for experimental observation of topological superfluid states.

Abstract

Chiral d-wave superfluid is a preliminary example of topological matters that intrinsically encodes interaction effects. It exhibits fascinating properties including a finite Chern number in the bulk and topologically protected edge states, which have been invoking physicists for decades. However, unlike s-wave superfluids prevalent in nature, its existence requires a strong interaction in the d-wave channel, a criterion that is difficult to access in ordinary systems. So far, such an unconventional superfluid has not been discovered in experiments. Here, we present a new principle for creating a two-dimensional chiral d-wave superfluid using periodically driven lattices. Due to an imprinted two-dimensional pseudospin-orbit coupling, where the sublattice index serves as the pseudospin, s-wave interaction between two hyperfine spin states naturally creates a chiral d-wave superfluid. This scheme also allows physicists to study the phase transition between the topologically distinct s- and d-wave superfluids by controlling the driving field or the particle density.