Bulletin of the American Physical Society
2017 Fall Meeting of the APS Prairie Section
Saturday–Sunday, November 11–12, 2017; University of Illinois at Chicago, Chicago, Illinois
Session C1: Session C |
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Chair: David Hofman, University of Illinois at Chicago Room: UIC Student Center East 302 |
Sunday, November 12, 2017 9:00AM - 9:12AM |
C1.00001: Probing for Lorentz Symmetry Violation in Electrons Using Trapped Yb$^{\mathrm{+}}$ Ions Noah Schlossberger, Phil Richerme Violations of local Lorentz invariance (LLI) are predicted by many physical theories beyond the standard model which attempt to unify gravity with other fundamental forces. Using an analogue of the Michelson-Morley test with trapped Ca$^{\mathrm{+}}$ ions [Nature 517, 592--595 (2015)], the current bound for LLI of electrons is less than 1 part in 10$^{\mathrm{-18}}$. By instead performing the measurements with Yb$^{\mathrm{+}}$ ions, which exhibit enhanced sensitivity to LLI breaking effects and much longer measurement times, we can push the bounds lower by 5 orders of magnitude. In this presentation, I outline an experimental configuration for such an experiment, laying out a measurement algorithm, addressing experimental concerns, and discussing necessary hardware. The experiment is specifically designed to utilize the existing ion trap apparatus in place at the Richerme lab at Indiana University Bloomington. [Preview Abstract] |
Sunday, November 12, 2017 9:12AM - 9:24AM |
C1.00002: Bose Fireworks in Driven Bose-Einstein Condensates. Lei Feng, Logan Clark, Zhendong Zhang, Anita Gaj, Jiazhong Hu, Cheng Chin We present our recent studies of non-equilibrium dynamics in Bose-Einstein condensates with modulated atomic interactions. By oscillating the s-wave scattering length in the condensates, we observe collective emission of matter-wave jets due to stimulated inelastic collision. Correlations between the emitted atoms show that the jet structure comes from the quantum fluctuations of the Bose condensate. Increasing the driving amplitude, we observe higher-order harmonic generation of the matterwave jets. The process is analogous to four-wave mixing in quantum optics. We further observe intricate correlations between all emitted jets, which demonstrate the intriguing dynamics of a strongly driven quantum system. [Preview Abstract] |
Sunday, November 12, 2017 9:24AM - 9:36AM |
C1.00003: Quantum Degeneracy in a Strongly Mass-Imbalanced Fermi-Bose Mixture Krutik Patel, B.J. DeSalvo, Geyue Cai, Cheng Chin We report the realization of a stable Bose-Einstein condensate of Cs overlapped with a degenerate Fermi gas of Li in an optical dipole trap. Such a system provides a platform to study Fermi-Bose quantum mixtures in the ground state with widely tunable interspecies interactions. In our first work, we observe Fermions trapped in the Bose condensates with attractive interspecies interactions. More recently, we study collective excitations of the condensate immersed in the Fermi gas. [Preview Abstract] |
Sunday, November 12, 2017 9:36AM - 9:48AM |
C1.00004: Construction of a Quantum Matter Synthesizer Jonathan Trisnadi, Kai-Xuan Yao, Mykhaylo Usatyuk, Mickey McDonald, Cheng Chin We report progress on the construction of a new platform to manipulate ultracold atoms. The “Quantum Matter Synthesizer (QMS)” will have the capability of deterministically preparing large 2D arrays of atoms with single site addressability. Cesium atoms are first transferred into a science cell (specially textured to reduce reflectance to ~0.1\% across a wide range of wavelengths and incident angles) via a moving 1D lattice, where they are loaded into a magic-wavelength, far-detuned 2D optical lattice. Two NA=0.8 microscope objectives surround the science cell from above and below. The higher objective will be used to project an array of optical tweezers created via a digital micromirror device (DMD) onto the atoms, while the lower objective will capture the site-resolved fluorescence image of the atoms in the lattices and tweezers. We provide updates on our magnetic-optical trap and Raman-sideband cooling performance, characterization of the resolution of our microscope objectives and DMD, and stability tests for the objective mounting structure. [Preview Abstract] |
Sunday, November 12, 2017 9:48AM - 10:00AM |
C1.00005: Mixing by cutting and shuffling: The effect of incorporating diffusion Mengying Wang, Ivan Christov Dynamical systems are commonly used to model mixing in fluid and granular flows.We consider a model one-dimensional discontinuous dynamical system (termed “cutting and shuffling”),and we present a comprehensive computational study of finite-time mixing.The properties of the system depend on several parameters in a sensitive way,and the effect of each parameter is examined.To improve the mixing efficiency and avoid pathological cases,we incorporate diffusion into this model dynamical system,and show it to be quite effective.Illustrative examples also show how to define the number of cutting interfaces and also a mixing norm to quantify the degree of mixing.The effect of diffusion is compared with cases which have no diffusion.We introduce fit functions for the number of cutting interfaces and the mixing norm to determined time constants of mixing for each different system considered.Systems with various different permutations (“shuffling” protocols) are considered,then average properties are computed.Specifically,a critical half-mixing time is identified,which leads to a rescaling of different dynamical regimes into a universal mixing behavior.This work confirms that a “cut-off phenomenon” also exists in discontinuous dynamical systems modeling mixing of granular materials. [Preview Abstract] |
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