Bulletin of the American Physical Society
49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 63, Number 5
Monday–Friday, May 28–June 1 2018; Ft. Lauderdale, Florida
Session Q02: Spin-Orbit Coupled Quantum Gases |
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Chair: Dominik Schneble, Stony Brook University Room: Grand A |
Thursday, May 31, 2018 8:00AM - 8:30AM |
Q02.00001: Inducing and probing dynamics in a spin-orbit coupled BEC Invited Speaker: Peter Engels Spin-orbit coupling (SOC) provides a very flexible tool for modifying the dispersion relation, and thus the dynamical properties of a BEC. The plane-wave phase of an SOC BEC features a double-well structure including a region of negative curvature. Effects of the associated negative mass have been revealed in our previous expansion experiments, where one edge of an expanding SOC BEC decelerated upon entering the negative mass regime. Based off of these studies, we have developed a range of experimental tools to excite and probe dynamics from the linear to the nonlinear regime, and even in extreme regimes such as shock waves or quantum turbulence. For example, by releasing an initially trapped BEC in the presence of a BEC background density, we can study the transition from sound to shock and show how the anisotropy of the spin-orbit coupling affects the shock structure. As a second example, static or moving barriers can be used to excite dynamics and even turbulence in a spin-orbit coupled BEC. Our experiments are corroborated by accompanying numerical simulations. The current status and future directions of this line of research will be discussed. [Preview Abstract] |
Thursday, May 31, 2018 8:30AM - 9:00AM |
Q02.00002: Spin-orbit coupling and supersolidity in optical superlattices Invited Speaker: Wolfgang Ketterle We use orbital levels in a double-well potential as pseudospin states. Two-photon Raman transitions between left and right wells induce spin-orbit coupling. This scheme does not require near resonant light, features adjustable interactions by shaping the double-well potential, and does not depend on special properties of the atoms. A Bose-Einstein condensate of sodium atoms with such spin-orbit coupling shows a supersolid phase featuring a density modulation (stripe phase) which has been detected via Bragg scattering. Reference: J. Li, J. Lee, W. Huang, S. Burchesky, B. Shteynas, F.C. Top, A.O. Jamison, and W. Ketterle, Observation of the supersolid stripe phase in spin-orbit coupled Bose-Einstein condensates, Nature 543, 91 (2017) [Preview Abstract] |
Thursday, May 31, 2018 9:00AM - 9:30AM |
Q02.00003: Chern numbers counted in a synthetic-dimension quantum Hall strip Invited Speaker: Ian Spielman Ultra cold atoms are remarkable systems with a truly unprecedented level of experimental control and one application of this control is creating topological band structures. The most natural approach centers on creating suitable real-space lattice potentials that the atoms experience. Here we present our experimental work which uses the internal atomic states as an additional ``synthetic'' dimension. We engineered a two-dimensional magnetic lattice in an elongated strip geometry, with effective per-plaquette flux about 4/3 times the flux quanta. The long direction of this strip is formed from a 1D optical lattice while the short direction is built from the 5 mF states comprising the f=2 ground state hyperfine manifold of Rb-87. We imaged the localized edge and bulk states of atomic Bose-Einstein condensates in this strip, with single lattice-site resolution along the narrow direction. In this 5-site wide strip we are able to delineate between bulk behavior quantified by Chern numbers and edge behavior which is not. [Preview Abstract] |
Thursday, May 31, 2018 9:30AM - 10:00AM |
Q02.00004: Spin-orbit coupling and interaction control with optical clock transitions in ultracold Fermi gases Invited Speaker: Leonardo Fallani I will report on recent experiments performed with ultracold quantum gases of two-electron 173Yb fermions. Thanks to the coherent control of their electronic state with ultranarrow optical clock transitions, we have demonstrated new schemes for spin-orbit coupling in pure two-level systems and the generation of tunable gauge fields in synthetic ladders. I will describe the latest experimental developments and the new perspectives offered by the control of atom-atom interactions with orbital Feshbach resonances. [Preview Abstract] |
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