Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session H2: Scientific Legacy of D. S. JinInvited
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Chair: Eric Cornell, University of Colorado, Boulder Room: 306-307 |
Wednesday, June 7, 2017 10:30AM - 11:00AM |
H2.00001: From the First Atomic Fermi Gas to a Bad Metal Invited Speaker: Brian DeMarco One of the most exciting frontiers in physics is ultracold quantum gases. They play a role in unraveling the physics of superfluids, exotic solids, and nuclear and quark matter. Like all particles, quantum gases come in two flavors: bosons and fermions. In this talk, I will briefly tell a few stories related to how Deborah Jin and I realized the first Fermi gas of atoms in 1999, including how we created the first enriched potassium sources, measured the $^{40}$K elastic collision cross-section, and a developed methods for detecting quantum degeneracy. I will describe how the legacy of this work is carried on by my group at Illinois in experiments on strongly correlated $^{40}$K lattice gases. I will discuss recent measurements of mass-current decay, the detection of incoherent transport, and the observation of a surprising decrease in the transport lifetime at higher temperatures. The connection between this discovery and T-linear resistivity in bad metals will be described. [Preview Abstract] |
Wednesday, June 7, 2017 11:00AM - 11:30AM |
H2.00002: Improving interferometric displacement detection with quantum correlations Invited Speaker: Cindy Regal Interferometers enable ultrasensitive measurement in a wide array of applications from gravitational wave searches to force microscopes. We now have the ability to study interferometers in the interesting limit in which quantum backaction places constraints on measurement sensitivity for a solid-state object. To enter this new regime we have constructed micromechanical devices at cryogenic temperatures that respond appreciably to radiation pressure in an optical cavity. Our most recent experiments show we can access quantum correlations that improve upon the standard quantum limit for continuous displacement detection. [Preview Abstract] |
Wednesday, June 7, 2017 11:30AM - 12:00PM |
H2.00003: Making a molecular gas in the quantum regime Invited Speaker: Kang-Kuen Ni Ultracold molecules are exciting systems for a large range of scientific explorations including studies of novel phases of matter and precision measurement. In this talk, I will present a brief story of the first quantum gas of molecules, KRb, created under my PhD advisor, Deborah Jin, in 2008. A complete surprise was finding ultracold chemistry in such a system through measurements of reactant losses. In particular, long-range physics that determines KRb reactant collision rates, including van der Waals interactions, quantum statistics, and dipolar interactions, were studied extensively. However, the short-range behavior of these chemical reactions remains unknown. A legacy of her work is carried out in my lab at Harvard, where we are integrating physical chemistry tools with cold atom techniques to study ultracold chemistry with KRb molecules. In particular, we aim to elucidate the four-center reaction $2 KRb \rightarrow K_2+Rb_2$ by detecting the reaction products through ionization – both identify the product species and mapping out their complete quantum states. [Preview Abstract] |
Wednesday, June 7, 2017 12:00PM - 12:30PM |
H2.00004: Dual Bose-Fermi Superfluids Invited Speaker: Christophe Salomon We study the dynamics of superfluid counterflow in a Bose-Fermi mixture of lithium atoms. First, by tuning the interaction strength we measure the critical velocity $v_c$ of the system in the BEC-BCS crossover in the low temperature regime and we compare it to the recent prediction of Castin {\em et al.}, Comptes Rendus Physique,{\bf 16}, 241 (2015). Second, raising the temperature of the mixture slightly above the superfluid transitions reveals an unexpected phase-locking of the oscillations of the clouds induced by dissipation. Finally, we investigate the lifetime of the Bose-Fermi mixture. We show theoretically and experimentally that, for weak inter-species coupling, the loss rate is proportional to Tan's contact parameter. At unitarity where the fermion-fermion scattering length diverges, we show that the loss rate is proportional the $4/3$ power of the fermionic density. This study demonstrates that impurity-induced losses can be used as a quantitative probe of many-body correlations. [Preview Abstract] |
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