Fabian Grusdt

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When a mobile impurity interacts with a many-body system, such as a phonon bath, a polaron is formed. Despite the importance of the polaron problem for a wide range of physical systems, a unified theoretical description valid for arbitrary coupling strengths is still lacking. Here we develop a renormalization group approach for analyzing a paradigmatic(More)
Topology and geometry are essential to our understanding of modern physics, underlying many foundational concepts from high-energy theories, quantum information, and condensed-matter physics. In condensed-matter systems, a wide range of phenomena stem from the geometry of the band eigenstates, which is encoded in the matrix-valued Wilson line for general(More)
When an impurity interacts with a bath of phonons it forms a polaron. For increasing interaction strengths the mass of the polaron increases and it can become self-trapped. For impurity atoms inside an atomic Bose-Einstein condensate (BEC) the nature of this transition is not understood. While Feynman's variational approach to the Fröhlich model predicts a(More)
Aditya Shashi,1,2 Fabian Grusdt,1,3,4 Dmitry A. Abanin,1,5,6 and Eugene Demler1 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA 2Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA 3Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany 4Graduate School Materials(More)
F. Grusdt,1,2,3 A. Shashi,3,4 D. Abanin,3,5,6 and E. Demler3 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany 2Graduate School Materials Science in Mainz, Gottlieb-Daimler-Strasse 47, 67663 Kaiserslautern, Germany 3Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA 4Department of Physics(More)
We analyze interacting ultracold bosonic atoms in a one-dimensional superlattice potential with alternating tunneling rates t1 and t2 and inversion symmetry, which is the bosonic analogue of the Su-Schrieffer-Heeger model. A Z2 topological order parameter is introduced which is quantized for the Mott insulating (MI) phases. Depending on the ratio t1/t2 the(More)
We study ultracold Rydberg-dressed Bose gases subject to artificial gauge fields in the fractional quantum Hall (FQH) regime. The characteristics of the Rydberg interaction give rise to interesting many-body ground states different from standard FQH physics in the lowest Landau level. The nonlocal but rapidly decreasing interaction potential favors(More)
Topological states of interacting many-body systems are at the focus of current research due to the exotic properties of their elementary excitations. In this paper we suggest a realistic experimental setup for the realization of a simple version of such a phase. We show how δ-interacting bosons hopping on the links of a one-dimensional ladder can be used(More)
Yulia E. Shchadilova,1,2,* Fabian Grusdt,2,3,4 Alexey N. Rubtsov,1,5 and Eugene Demler2 1Russian Quantum Center, Skolkovo 143025, Russia 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA 3Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany 4Graduate School Materials Science in Mainz,(More)
We introduce a classification of symmetry-protected topological phases applicable to stationary states of open systems based on a generalization of the many-body polarization. The polarization can be used to probe topological properties of noninteracting and interacting closed and open systems and remains a meaningful quantity even in the presence of(More)