Bulletin of the American Physical Society
46th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 60, Number 7
Monday–Friday, June 8–12, 2015; Columbus, Ohio
Session H2: Invited Session: Synthetic Gauge Fields and Topological Phases |
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Chair: Stefan Natu, Joint Quantum Institute Room: Union ABC |
Wednesday, June 10, 2015 10:30AM - 11:00AM |
H2.00001: Magnetism, rotons, and beyond: engineering atomic systems with lattice shaking Invited Speaker: Colin Parker Conventional methods of quantum simulation rely on kinectic energy determined by free particle dispersions or simple sinusoidal optical lattices. Solid state sytems, by contrast, exhibit a plethora of band structures which differ quantitatively, qualitatively, and even topologically. To what extent does this variety explain the many electronic phenomena observed in these materials? Here we address this question by subjecting an otherwise simple Bose superfluid to a customized band structure engineered by dynamically phase modulating (shaking) an optical lattice. The engineered dispersion contains two minima which we associate to a pseudospin degree of freedom. Surprisingly, in such a system the Bose superfluid exhibits many new behaviors. The psuedospin develops a ferromagnetic order, which can lead to polarization of the entire sample or to sub-division into polarized domains. The excitations of the system also exhibit the roton-maxon structure associated with strong interactions in superfluid helium. [Preview Abstract] |
Wednesday, June 10, 2015 11:00AM - 11:30AM |
H2.00002: Accessing unconventional quantum phenomena using synthetic gauge fields Invited Speaker: Qi Zhou The recent realization of synthetic gauge fields, using either the Raman scheme or shaken lattices, provides physicists a new means to control ultracold atoms. This talk will address how to use such synthetic gauge fields to access and explore a variety of unconventional quantum phenomena that are difficult to reach in other systems. I will first discuss a quartic dispersion that leads to the absence of a condensate even at zero temperature in two dimensions. This offers physicists an ideal simulator of the quantum Lifshitz model for realizing a two-dimensional algebraic quantum liquid and directly visualizing the deconfinement transition of vortices. I will then discuss schemes for studying a number of topological phenomena in ultracold atoms, such as topological flat bands, quantum anomalous hall effect, and Weyl points in a band structure. Thanks to photon-assisted band hybridizations in shaken lattices, rich topological phenomena naturally emerge without resorting to extra external fields. These examples compose an overture to a new era that will be brought by the interplay between synthetic gauge fields and the highly tunable ultracold atoms. [Preview Abstract] |
Wednesday, June 10, 2015 11:30AM - 12:00PM |
H2.00003: Signatures of Fractional Exclusion Statistics in the Spectroscopy of Quantum Hall Droplets Invited Speaker: Nigel Cooper One of the most dramatic features of strongly correlated phases is the emergence of quasiparticle excitations with unconventional quantum statistics. The archetypal example is the fractional, ``anyonic," quantum statistics predicted for quasiparticles of the fractional quantum Hall phases. While experiments on semiconductor devices have shown that these quasiparticles have fractional charges, a direct observation of the fractional statistics has remained lacking. In this talk I shall show how precision spectroscopy measurements of rotating droplets of ultracold atoms might be used to demonstrate the Haldane fractional exclusion statistics of quasiholes in the Laughlin state of bosons. The characteristic signatures appear in the single-particle excitation spectrum. I shall show that the transitions are governed by a ``many-body selection rule'' which allows one to relate the number of allowed transitions to the number of quasihole states. I shall illustrate the theory with numerically exact simulations of small numbers of particles. [Preview Abstract] |
Wednesday, June 10, 2015 12:00PM - 12:30PM |
H2.00004: Dissipative self-assembly of fractional quantum Hall states of light Invited Speaker: Eliot Kapit The generation of a fractional quantum Hall state of bosons has been an important goal in both atomic and optical physics, but due to a number of difficult experimental challenges, these states have yet to be realized in the many-body limit. In this talk, I discuss a simple mechanism which answers one of the outstanding questions in quantum optical systems: how can we stabilize a strongly correlated, many-body photon state against particle losses? I will show that by using parametric amplifiers to couple the fractional quantum Hall state to an auxiliary, intentionally lossy system, fractional quantum Hall states of light can be passively generated and stabilized in arbitrarily large systems. This mechanism could be implemented in any strongly interacting photonic system, such as Rydberg polaritions, or mobile excitations in arrays of trapped ions or superconducting qubits. [Preview Abstract] |
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