Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Gases (Bosons and Fermions) I
Q 12.1: Talk
Monday, March 11, 2019, 14:00–14:15, S HS 037 Informatik
Measuring quantized circular dichroism in ultracold topological matter — •Luca Asteria1, Duc Thanh Tran2, Tomoki Ozawa3, Matthias Tarnowski1,4, Benno S. Rem1,4, Nick Fläschner1,4, Klaus Sengstock1,4,5, Nathan Goldman2, and Christof Weitenberg1,4 — 1Institut für Laserphysik, Universität Hamburg, Germany — 2Center for Nonlinear Phenomena and Complex Systems,Université Libre de Bruxelles, Brussels, Belgium — 3Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS), RIKEN, Wako, Saitama 351-0198, Japan — 4The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany — 5Zentrum für Optische Quantentechnologien, Universität Hamburg, 22761 Hamburg, Germany
The topology of two-dimensional materials traditionally manifests itself through the quantization of the Hall conductance, which is revealed in transport measurements.
Recently, it was predicted that topology can also give rise to a quantized spectroscopic response upon subjecting a Chern insulator to a circular drive.
Here we experimentally demonstrate this intriguing topological effect for the first time, using ultracold fermionic atoms in topological Floquet bands.
In addition, our depletion-rate measurements also provide a first experimental estimation of the Wannier-spread functional, a fundamental geometric property of Bloch bands.