Realization of a Cross-Linked Chiral Ladder with Neutral Fermions in a 1D Optical Lattice by Orbital-Momentum Coupling

Jin Hyoun Kang, Jeong Ho Han, and Y. Shin
Phys. Rev. Lett. 121, 150403 – Published 12 October 2018
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Abstract

We report the experimental realization of a cross-linked chiral ladder with ultracold fermionic atoms in a 1D optical lattice. In the ladder, the legs are formed by the orbital states of the optical lattice and the complex interleg links are generated by the orbital-changing Raman transitions that are driven by a moving lattice potential superimposed onto the optical lattice. The effective magnetic flux per ladder plaquette is tuned by the spatial periodicity of the moving lattice, and the chiral currents are observed from the asymmetric momentum distributions of the orbitals. The effect of the complex cross-links is demonstrated in quench dynamics by measuring the momentum dependence of the interorbital coupling strength. We discuss the topological phase transition of the chiral ladder system for the variations of the complex cross-links.

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  • Received 3 July 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.150403

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Jin Hyoun Kang, Jeong Ho Han, and Y. Shin*

  • Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea and Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea

  • *yishin@snu.ac.kr

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Issue

Vol. 121, Iss. 15 — 12 October 2018

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