Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.16: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Exploring the Single-Particle and Many-Body Mobility Edge in a 1D Quasiperiodic Optical Lattice — •Thomas Kohlert1,2, Sebastian Scherg1,2, Henrik Lüschen1,2, Michael Schreiber1,2, Pranjal Bordia1,2, Monika Aidelsburger1,2, Xiao Li3, Sankar Das Sarma3, and Immanuel Bloch1,2 — 1Ludwig-Maximilians-Universität, Schellingstr. 4, 80799 München, 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
A single-particle mobility edge (SPME) marks a critical energy separating extended from localized states in a quantum system. In this work, we find experimental evidence for the existence of such a SPME in a one-dimensional quasi-periodic optical lattice. Specifically, we find a regime where extended and localized single-particle states coexist, in good agreement with theoretical simulations, which predict a SPME in this regime. In the corresponding interacting system we find that the dynamics is continuously slowing down as we approach a critical disorder strength, indicating that the system shows many-body localization (MBL). We juxtapose two models with and without SPME and compare their dynamics on short and long timescales and find that the interacting system does not delocalize on short timescales despite the presence of single-particle extended states. Finally, we discuss whether a many-body mobility edge (MBME) might be present in our system.