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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster: Quantum Optics and Photonics I
Q 15.29: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Detection of topological order in interacting many-body systems using mobile impurities — •Fabian Grusdt1,2,3, Norman Yao3, Dmitry Abanin3,4,5, and Eugene Demler3 — 1Department of Physics and research center OPTIMAS, University of Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Kaiserslautern, Germany — 3Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA — 4Perimeter Institute for Theoretical Physics, Waterloo, Canada — 5Institute for Quantum Computing, Waterloo, Canada
We present a scheme for the detection of topological order in interacting many-body systems. Our method is based on a generalization of single-particle interferometric schemes developed for the detection of topological invariants of band structures [Atala et.al., Nature Physics 9, 795 (2013)]. We suggest to couple a spin-1/2 impurity to a (topological) excitation of the many-body system. Performing Ramsey interferometry in combination with Bloch oscillations of the resulting composite particle (a strong-coupling topological polaron) allows to directly detect many body-topological invariants. We demonstrate the feasibility of our scheme by discussing integer and fractional Chern insulators in two dimensions, and show how fractionalized excitations can be detected. We also consider one-dimensional systems and show how symmetry-protected topological invariants can be measured.