[Aspuru-Guzik Group List] TODAY: Immanuel Bloch-HQOC/ITAMP Joint Quantum Sciences Seminar

HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, November 30, 2016 4:00 PM, Jefferson 250 Prof. Immanuel Bloch, Max Planck Institute for Quantum Optics, LMU "Probing Hidden Non-Local Antiferromagnetism & Many-Body Localisation Using Ultracold Atoms Recent experiments with quantum gas microscopes allow for an unprecedented view and control of quantum matter in new parameter regimes and with new probes. In our fermionic quantum gas microscope, we can detect both charge and spin degrees of freedom simultaneously, thereby gaining maximum information about undoped or strongly doped fermionic Hubbard systems. The doped 1D systems are characterised by a hidden non-local antiferromagnetic (AFM) order that can be revealed using non-local string correlators, very similar to the non-local topological order in Spin-1 Haldane chains. The hidden AFM order probed in our experiments is the foundation of spin-charge separation in one-dimensional fermionic systems. Finally, I will discuss our recent experiments on novel many-body localised (MBL) states of matter that challenge our understanding of the connection between statistical physics and quantum mechanics at a fundamental level. I will also discuss very recent experiments, in which he have observed evidence for Griffith type anomalous slow transport on the ergodic side of the MBL transitions. Matthew Rispoli, Greiner Group "Quantum Gas Microscopy in the Interacting Harper-Hofstadter Model" I will describe recent experimental results in which we perform microscopy of interacting atoms in the presence of a synthetic magnetic field. A developing, exciting area in the AMO community has been the generation of artificial magnetic fields for neutral atoms, which do not naturally experience a Lorentz force [1]. This has led to many elegant studies of the kinds of single particle effects that can emerge, such as edge states, topological band structures, and the quantum hall effect [2,3,4,5,6]. In this work, we combine artificial gauge fields --- systems with topological character --- and interactions. Realizing this combination is essential to advance into the regime of fractional quantum hall physics, Chern insulators, and the like, as well as to drive explorations for new phenomena with the microscopic tools of AMO systems. In particular, I will describe our observation of interaction-induced chirality, which illustrates the rich physics that can emerge with these ingredients, even in the few particle limit. [1] Y.J. Lin, et. al., PRL 462, 628-632 (2009) [2] M. W. Zwierlein, et. al., Nature 435, 1047-1051 (2005) [3] B. K. Stuhl, et. al, Science 349, 1514-1518 (2015) [4] M. Mancini, et. al, Science 349, 1510-1513 (2015) [5] M. Aidelsburger, et. al., PRL 111, 185301 (2013) [6] Hirokazu Miyake, et. al., PRL 111, 185302 (2013) Student Presentation from 4:00-4:10 PM Refreshments Served from 4:10-4:30 PM Guest Presentation from 4:30-6:00 PM -- Clare Ploucha Faculty Assistant to Professors Lukin & Greiner and their labs Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544