Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.31: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Direct Measurement of the Zak phase in Topological Bloch Bands — •Monika Aidelsburger1,2, Marcos Atala1,2, Julio T. Barreiro1,2, Dmitry Abanin3, Takuya Kitagawa3, Eugene Demler3, and Immanuel Bloch1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstr. 4, 80799 Munich, Germany — 2Max-Planck Institute of Quantum Optics, Hans-Kopfermann Str. 1, 85748 Garching, Germany — 3Department of Physics, Harvard University, 17 Oxford Str., Cambridge, MA 02138, USA
Geometric phases can characterize the topological properties of Bloch bands. In one-dimensional periodic potentials the topological invariant is given by the Zak phase -- the Berry phase acquired during an adiabatic motion of a particle across the Brillouin zone. Here we will present the direct measurement of the Zak phase for a dimerized optical lattice, which models polyacetylene. The experimental protocol consists of a combination of Bloch oscillations and Ramsey interferometry. This work establishes a new general approach for probing the topological structure of Bloch bands in optical lattices.