Detecting d-wave superfluid and d-density wave states of ultracold Fermions on optical lattices

TL;DR

This paper proposes a pump probe experimental method to detect and distinguish d-wave superfluid and d-density wave phases in ultracold Fermions on optical lattices by analyzing momentum distribution changes and density correlations.

Contribution

It introduces a novel pump probe technique utilizing lattice modulation to identify the symmetry and properties of exotic quantum phases in ultracold fermionic systems.

Findings

Pump modulation creates quasiparticle pairs for detection.

Momentum distribution changes reveal quasiparticle dispersion and gap anisotropy.

Density-density correlations provide phase-sensitive symmetry information.

Abstract

We propose a pump probe experiment for detecting the d-wave superfluid and d-density wave phases of ultracold Fermions on an optical lattice. The pump consists of periodic modulations of the optical lattice intensity which creates quasiparticle pairs in these systems. The changes in the momentum distribution under the drive can be used to measure quasiparticle dispersion and gap anisotropy. Further, we show that the pattern of peaks and dips in the spin selective density-density correlation function provides a phase sensitive probe of the symmetry of the order parameter in these systems.