# Topological Creutz Ladder in a Resonantly Shaken 1D Optical Lattice

## TL;DR

This paper demonstrates the experimental realization of a topological Creutz ladder using ultracold fermionic atoms in a resonantly shaken 1D optical lattice, revealing topological properties through interferometric measurements.

## Contribution

It introduces a novel method to create a topological Creutz ladder in a cold atom system using resonant lattice shaking and demonstrates topological features via momentum-resolved interferometry.

## Key findings

- Successful creation of a topological Creutz ladder with ultracold atoms.
- Observation of pseudo-spin winding in topologically non-trivial bands.
- Proposal of a topological charge pumping scheme for the system.

## Abstract

We report the experimental realization of a topological Creutz ladder for ultracold fermionic atoms in a resonantly driven 1D optical lattice. The two-leg ladder consists of the two lowest orbital states of the optical lattice and the cross inter-leg links are generated via two-photon resonant coupling between the orbitals by periodic lattice shaking. The characteristic pseudo-spin winding in the topologically non-trivial bands of the ladder system is demonstrated using momentum-resolved Ramsey-type interferometric measurements. We discuss a two-tone driving method to extend the inter-leg link control and propose a topological charge pumping scheme for the Creutz ladder system.