Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y26: Interacting Quantum Gases |
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Sponsoring Units: DAMOP Chair: Christopher Hooley, University of St. Andrews Room: LACC 404A |
Friday, March 9, 2018 11:15AM - 11:27AM |
Y26.00001: Abstract Withdrawn
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Friday, March 9, 2018 11:27AM - 11:39AM |
Y26.00002: Virial expansion for the Tan contact and Beth-Uhlenbeck formula from 2D SO(2,1) anomalies Wilder DAZA ROMERO, Chris Lin, Carlos R Ordonez The relationship between 2D $SO(2,1)$ conformal anomalies and the virial expansion is explored, using recently developed path-integral methods. In the process, the Beth-Uhlenbeck formula for the shift of the second virial coefficient $\delta b_2$ is obtained, as well as a virial expansion for the Tan contact for these systems. A possible extension of these techniques for higher order shifts is discussed. |
Friday, March 9, 2018 11:39AM - 11:51AM |
Y26.00003: Achieving higher superfluid transition Tc in atomic Fermi gases using mixed dimensionality Qijin Chen, Leifeng Zhang, Jibiao Wang, Yanming Che Achieving a higher superfluid transition Tc has been a goal for the fields of superconductivty and atomic Fermi gases. In this talk, I will present a study on the exotic superfluid and pairing phenomena in two component atomic Fermi gases in mixed dimensions, where one component feels a regular 3D continuum space, while the other is subject to a 1D optic lattice potential. Via tuning the lattice spacing and depth, one can manipulate the effective dimensionality of the lattice component from quasi-3D to quasi-1D. I shall use a pairing fluctuation theory to address the pairing phenomena beyond BCS mean-field approximations; when the interaction is strong, pairing fluctuations lead to a pseudogap and necessarily suppress Tc from its mean-field solution. In addition to the exotic pairing phenomena caused by Fermi surface mismatch, here we show that one can tune the shape of the Fermi surface of the lattice component such that the maximum Tc attainable in such a system well surpasses that in an ordinary 3D Fermi gas, making the superfluid phase easier to access experimentally. |
Friday, March 9, 2018 11:51AM - 12:03PM |
Y26.00004: s-wave Contacts of Quantum Gases in Quasi-one and Quasi-two Dimensions Mingyuan He, Qi Zhou Contact and universal thermodynamic relations provide physicists a unique and powerful tool to bridge few- and many-body physics in dilute quantum systems and have been extensively studied in different dimensions separately in the past decade. In quasi-one- or quasi-two-dimensional traps with strong transverse confinements, quantum gases behave as strictly one- or two-dimensional systems at large length scales, while the two-body scattering intrinsically has three-dimensional characteristics at short distance such that an exact description of any universal thermodynamic relation requires three-dimensional contacts. A fundamental question arises as to whether one- or two-dimensional contacts, which were originally defined for strictly one or two dimensions, are capable of describing quantum gases in quasi-one- or quasi-two-dimensional traps. In this talk, I will show an exact relation between the three- and low-dimensional contacts in these highly anisotropic traps. Such relation allows one to directly connect physical quantities at different length or momentum scales, and to characterize the quasi-one- or quasi-two-dimensional traps using universal thermodynamic relations that were derived for strict one or two dimensions. |
Friday, March 9, 2018 12:03PM - 12:15PM |
Y26.00005: Strong coupling effects on p-wave contacts of a one-component ultracold Fermi gas Daisuke Inotani, Yoji Ohashi In this presentation, we investigate two p-wave contacts Cv and CR, which are respectively related to the scattering volume v and the effective range R of a p-wave interaction, of a one-component ultracold Fermi gas within the framework of a strong-coupling theory developed by Nozieres and Schmitt-Rink [1]. We show that, as decreasing temperature, while in the strong-coupling regime Cv monotonically increases, in the weak-coupling regime Cv start to decrease at some temperature. We clarify the physical origin of this non-monotonic temperature dependence of Cv in the weak-coupling regime. |
Friday, March 9, 2018 12:15PM - 12:27PM |
Y26.00006: Kosterlitz-Thouless Transition in 2D Interacting Bose Systems Pengtao Shen, Benjamin Fregoso, Khandker Quader We explore the possibility of Kosterlitz-Thouless (KT) transition in interacting two-dimensional (2D) Bose systems. To go beyond mean-field theory and treat correlations, we use a Matsubara Green’s function method, and study scaling structure of the interacting Green’s function just above the transition. We use the Bose-Einstein condensation criterion that the chemical potential equals the self-energy at zero frequency and momentum, thereby making the spectrum gapless. We calculate numerically self-consistent solutions of self-energy to 2nd order in the interaction strength, for the entire range of momentum, k, and compare our findings with analytic results in the limits of low- and high-k. This allows us to calculate a universal scaling parameter (independent of interaction strength) in the scaling equation for critical density and critical temperature, as well as the critical temperature, and jump in superfluid mass density. We examine the possibility of applying this method to 2D dipolar Bose systems. |
Friday, March 9, 2018 12:27PM - 12:39PM |
Y26.00007: Abstract Withdrawn
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(Author Not Attending)
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Y26.00008: Realizing Fulde-Ferrell Superfluids via a Dark-State Control of Feshbach Resonances Lianyi He, Hui Hu, Xia-Ji Liu We propose that the long-sought Fulde-Ferrell superfluidity with nonzero |
Friday, March 9, 2018 12:51PM - 1:03PM |
Y26.00009: Dynamics of pair, trion, and other phases of one dimensional Fermi mixtures Binbin Tian, Yuchi He, Roger Mong, David Pekker We consider mixtures of two or three component fermions in one dimension. These mixtures are known to have rich phase diagrams. For example, three component mixtures with attractive interactions include (a) paired, (b) color-superfluid, and (c) trion phases. In order to understand how to distinguish these phases experimentally, we study the dynamics of these mixtures using time-evolving-block-decimation (TEBD). We focus on two types of experiments. First, we investigate the dynamics after a local perturbation, as would be measured in a cold-atoms experiment. Second, we compute the unequal-time correlation functions and use linear response theory to obtain the dc conductivity at a finite bias, as would be measured in a solid-state tunnel spectroscopy experiment. |
Friday, March 9, 2018 1:03PM - 1:15PM |
Y26.00010: Quantum simulations of the Abelian Higgs model with a bosonic ladder Yannick Meurice, Jin Zhang, Shan-wen Tsai We propose to use a physical ladder of bosonic atoms to quantum simulate a lattice gauge theory called the Abelian Higgs model. |
Friday, March 9, 2018 1:15PM - 1:27PM |
Y26.00011: Fermi Liquid Parameters from a Crossing Symmetric Equations Model for the Unitary Fermi Gas Kelly Reidy, Kevin Bedell, Khandker Quader We study medium effects in a 3D Fermi system with attractive interaction of arbitrary strength, in particular, close to the unitary limit. Fermi liquid interaction parameters, characterizing effects of the medium, are obtained employing a crossing-symmetric equations method. Using these we calculate scattering amplitudes, which allow us to study thermodynamics, transport and pairing properties, and calculate the Berstch parameter. We discuss how our results may apply to cold gas near the unitary limit. |
Friday, March 9, 2018 1:27PM - 1:39PM |
Y26.00012: Theoretical Study of Li-Cs Degenerate Trapped Fermi-Bose Mixtures Han Fu, Fnu Setiawan, Kathryn Levin Recent experiments by deSalvo et al [ArXiv 1706.01220] have observed a |
Friday, March 9, 2018 1:39PM - 1:51PM |
Y26.00013: Trial Wave Functions for Ring-Trapped Ions and Neutral Atoms: Microscopic Description of the Quantum Space-Time Crystal Constantine Yannouleas, Uzi Landman A theory for quantum space-time crystals (QSTCs) of N interacting and ring-confined rotating particles is presented. The QSTC many-body trial wave functions are obtained via symmetry breaking at the mean-field level followed by symmetry restoration using projection techniques. These wave functions are stationary states and preserve the rotational symmetries, and at the same time they reflect the point-group |
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