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Q: Fachverband Quantenoptik und Photonik
Q 25: Poster: Quantum Optics and Photonics I
Q 25.17: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Atrium Informatik
Measuring symmetry protected Wilson lines — •Christoph Braun1,2, Karen Wintersperger1,2, Jakob Näger1,2, Immanuel Bloch1,2, and Monika Aidelsburger1,2 — 1Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann Straße 1, 85748 Garching, Germany
Utilizing ultracold 39K in an optical honeycomb potential we study the geometric properties of the two lowest energy bands.
Rapid lattice acceleration introduces an energy scale that redners the lowest two bands effectively degenerate [1]. In this regime the evolution during transport is goverened purely by the geometry of the underlying lattice and is described by a dispersion-independent Wilson line. For certain paths in momentum space featuring the symmetry of the lattice, the Wilson line eigenvalues remain fixed to 3rd roots of unity even away from the atomic limit [2]. By deforming the lattice we study how different broken symmetries modify the eigenvalues of the respective Wilson lines.
[1] T. Li, et al., Science 352, 1094 (2016).
[2] J. Höller and A. Alexandradinata, Phys. Rev. B 98, 024310 (2018).