Hannover 2016 – wissenschaftliches Programm

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SYAD: Symposium SAMOP Dissertation-Prize 2016

SYAD 1: SAMOP Dissertation-Prize

SYAD 1.2: Hauptvortrag

Dienstag, 1. März 2016, 11:30–12:00, e415

Many-body physics with impurities in ultracold quantum gases — •Fabian Grusdt — Department of Physics and research center OPTIMAS, University of Kaiserslautern, Germany — Graduate School Materials Science in Mainz, Kaiserslautern, Germany — Department of Physics, Harvard University, Cambridge, MA 02138, USA

The properties of a many-body system can differ vastly from those of its individual constituents, for example the quantum numbers which are integer quantized without interactions can become fractionalized. In this talk I consider mobile impurity atoms interacting with the elementary excitations of different many-body systems. On the one hand they can serve as a coherent probe of the elementary excitations. In this context I will present a measurement scheme for fractional topological invariants of quantum Hall systems, which also has possible applications for building a robust topological quantum computer. On the other hand, the impurity can induce strong interactions between elementary excitations and create a correlated many-body system on its own. This happens, for example, for an impurity atom immersed in a Bose-Einstein condensate, where a new quasiparticle - the polaron - is formed. I developed a theoretical approach which provides an efficient description of polarons valid at arbitrary coupling strength and thus solves a long-standing problem of polaron physics.