Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session L19: Atoms and Molecules in CavitiesInvited
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Sponsoring Units: DAMOP Chair: Benjamin Lev, Stanford University Room: 278-279 |
Wednesday, March 15, 2017 11:15AM - 11:51AM |
L19.00001: Room-temperature polariton condensation and superfluidity in an organic microcavity Invited Speaker: Stephane Kena-Cohen Bose-Einstein condensation of ultracold atoms and superfluidity have been some of the most stunning demonstrations of macroscopic quantum behaviour. We will show how hybrid light-matter particles called polaritons that form in organic microcavities can show similar behaviour, but in simple room-temperature table-top experiment in ambient conditions. First, we will describe condensation of polaritons under non-resonant excitation in a microcavity containing a thin film of 2,7-bis[9,9-di(4-methylphenyl)-fluoren-2-yl]-9,9-di(4-methylphenyl)fluorene and highlight features such as the formation of long-range spatial coherence, vortices and dynamic instabilities. Then, we will show how under resonant excitation, polariton fluids can exhibit a transition from supersonic flow to superfluid flow and propagate in a sample unimpeded by the presence of scatterers. [Preview Abstract] |
Wednesday, March 15, 2017 11:51AM - 12:27PM |
L19.00002: Dynamic gauge fields and topological state of fermionic quantum gases in optical cavities Invited Speaker: Corinna Kollath The realization and control of topologically non-trivial quantum phases is currently of great interest after discovery of the topological insulators. The extended edge state existing in such materials are non-local and linked to the topological characteristics of the bulk. Therefore they are well protected against environmental influences and ideal candidates for quantum computation. It is not easy to manipulate the topologically protected quantities, which are typically of non-local character, via local and unitary operations. This difficulty can be overcome by coupling atoms to the cavity field which leads to an effective long-range interaction betweem atoms. We discuss how a fermionic quantum gas confined to a two-dimensional optical lattice and coupled to an optical cavity together with a running pump laser beam, can organize into a topologically non-trivial state. The cavity field emerges spontaneously and induces a dynamical gauge field. This feedback leads to the self-organization of the topological quantum state which carries an extended edge state as the attractor state of a dissipative dynamics in a finite system. [Preview Abstract] |
Wednesday, March 15, 2017 12:27PM - 1:03PM |
L19.00003: Quantum phases from competing short- and long-range interactions in an optical lattice Invited Speaker: Manuele Landini The theoretical and experimental characterization of complex systems and their phase transitions is, often times, exceedingly challenging. Simulation experiments with ultra-cold atoms can help in this regard by allowing for almost perfect control over the system's characteristics. We experimentally realize a bosonic lattice model and observe the rich phase diagram resulting from the competition between the different terms in the Hamiltonian: kinetic energy, on-site interactions, and infinite ranged interactions. Our system is based on an atomic quantum gas trapped in an optical lattice inside a high finesse optical cavity. The strength of the short-ranged on-site interactions is controlled by means of the optical lattice depth. The infinite-ranged interaction potential is mediated by scattering of a transverse pump laser beam into a vacuum mode of the cavity and is independently controlled by the detuning of the pump to cavity resonance. We observe the phase diagram of the system, composed of a superfluid, a super-solid, a Mott insulator and a charge density wave insulator. The phase transition between the two insulating phases is impeded by the presence of metastable states separated by energetic barriers. By monitoring the system across the insulator to insulator boundary, we observe a hysteresis loop and the emergence of two distinct time scales in the dynamics of the corresponding order parameter. We interpret our findings in the context of a mean-field model featuring metastable many-body states. [Preview Abstract] |
Wednesday, March 15, 2017 1:03PM - 1:39PM |
L19.00004: Bosons in a narrow-band optical resonator Invited Speaker: Andreas Hemmerich I will review our recent results on atom-cavity physics with a rubidium Bose-Einstein condensate in a recoil resolving narrow bandwidth optical resonator. I will discuss cooling on a sub-recoil energy scale [1], in-situ monitoring of Bloch oscillations [2], matter wave superradiance [3], non-equilibrium dynamics in the open Dicke model [4], and the emergence of a self-organized cavity-induced Mott insulator [5]. References [1] M. Wolke, et al., Science 337, 85-87 (2012) [2] H. Ke{\ss}ler, et al., New Journal of Physics 18, 102001 (2016) [3] H. Ke{\ss}ler, et al., Phys. Rev. Lett. 113, 070404 (2014) [4] J. Klinder, et al., PNAS 112, 3290 (2015) [5] J. Klinder, et al., Phys. Rev. Lett. 115, 230403 (2015) [Preview Abstract] |
Wednesday, March 15, 2017 1:39PM - 2:15PM |
L19.00005: Multimode Optomechanics with Cold Atoms Invited Speaker: Lukas Buchmann Recent years have brought much progress in the motional control of cold atomic samples. So much so, that in many respects this motion can be now considered a controllable quantum resource. I will review some recent results in this domain, ranging from experimentally realized coupling of atomic motion mediated by the field of an optical resonator to the theoretical study of exploiting forces between atoms dressed with external laser fields. In the latter case, the strong van-der-Waals interactions between atoms in Rydberg states are inherited via dressing with off-resonant laser fields. The tunability of the interactions between any two trapped atoms allows intricate engineering of the quantum mechanical state of motion of a many-body system consisting of a large number of atoms trapped in an optical lattice or a tweezer array. [Preview Abstract] |
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