Heidelberg 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Gases: Fermions I
Q 4.4: Vortrag
Montag, 23. März 2015, 12:15–12:30, K/HS2
Many-Body Localisation of Fermions in a Quasi-Random 1D Lattice — •Michael Schreiber1,2, Pranjal Bordia1,2, Henrik Lüschen1,2, Sean Hodgman1,2, Ulrich Schneider1,2, Immanuel Bloch1,2, Mark Fischer3, Ronen Vosk3, and Ehud Altman3 — 1Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans Kopfermann Str. 1, 85748 Garching b. München — 3Weizmann Institute of Science, Rehovot 76100, Israel
While Anderson localisation of non-interacting particles has been studied extensively, much less is known about localisation in interacting systems. As an experimental probe, we study the breakdown of ergodicity and the resulting absence of thermalisation, which is one key feature of localised systems. We have investigated the many-body localisation transition for interacting ultracold fermions in a quasi-random 1D lattice by measuring the relaxation dynamics of an initial Charge Density Wave (CDW). Utilising a band mapping technique in an additional superlattice, we can measure the relative imbalance between atoms on even and odd sites, which serves as our CDW order parameter. While the imbalance quickly decays in the thermalising case, a CDW persisting for long evolution times reveals the breakdown of ergodicity and many-body localisation.