Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Ultra-cold atoms (joint session A/Q)
A 13.3: Vortrag
Mittwoch, 13. März 2019, 11:00–11:15, S HS 1 Physik
Observation of many-body localization in a one-dimensional system with single-particle mobility edge — •Thomas Kohlert1,2, Sebastian Scherg1,2, Xiao Li3, Henrik Lüschen1,2, Sankar Das Sarma3, Immanuel Bloch1,2, and Monika Aidelsburger1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität München, Schellingstr. 4, 80799 Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 3Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742-4111, USA
In this work we experimentally study many-body localization (MBL) in a one-dimensional bichromatic quasiperiodic potential with a single-particle mobility edge (SPME) using ultracold atoms. We measure the time evolution of the density imbalance between even and odd lattice sites from an initial charge density wave, and analyze the corresponding relaxation exponents. We find clear signatures of MBL in this system when the corresponding noninteracting model is deep in the localized phase. We also critically compare and contrast our results with those from a tight-binding Aubry-André model, which does not exhibit an SPME.