Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session D03: Atomic, Molecular, and Optical Physics II |
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Chair: John Yukich, Davidson College Room: Holiday Inn Resort Turtlewatch |
Thursday, November 7, 2019 4:30PM - 5:00PM |
D03.00001: An ion-atom hybrid trap for translational and rotational cooling of molecular ions. Invited Speaker: Jyothi Saraladevi Hybrid ion-atom traps are a good platform for investigating the rich chemical interactions between cold ions and atoms. These traps are also proposed to achieve translationally and internally cold molecular ions. To facilitate these studies, we have developed a hybrid trap by spatially overlapping a linear ion trap with a magneto-optical trap (MOT) for potassium (K) atoms. The laser-cooled calcium (Ca$^{\mathrm{+}})$ ions can efficiently sympathetically cool the translational motion of the molecular ions. The internal states of the molecular ions can be sympathetic cooled using the laser-cooled neutral atoms. Our ion- atom hybrid trap is integrated with a high-resolution time-of-flight mass spectrometer (TOFMS) for the identification of any reaction products. We present our experimental results on the charge exchange interaction between cold K and Ca$^{\mathrm{+}}$. The prospects for rotational cooling of CaH$^{\mathrm{+}}$ molecular ions by interaction with cold K atoms will be discussed. [Preview Abstract] |
Thursday, November 7, 2019 5:00PM - 5:30PM |
D03.00002: Probing dynamical properties of Fermi-Hubbard systems with a quantum gas microscope Invited Speaker: Peter Schauss The normal state of high-temperature superconductors exhibits anomalous transport and spectral properties that are poorly understood. Cold atoms in optical lattices have been used to realize the Fermi-Hubbard model, widely believed to capture the essential physics of these materials. The recent development of fermionic quantum gas microscopes has enabled the study of Hubbard systems with single-site resolution. Most studies have focused on probing equal-time spin and density correlations. In this talk, I will report on using a quantum gas microscope to probe response functions associated with unequal-time correlations relevant for understanding the pseudogap and strange metal regimes of Fermi-Hubbard systems. First, I will describe the development of a technique to measure microscopic diffusion, and hence resistivity, in doped Mott insulators. We observed T-linear resistivity and a violation of the Mott-Ioffe-Regel limit, two signatures of strange metallic behavior. Next, I will report on the development of angle-resolved photoemission spectroscopy (ARPES) for Hubbard systems and its application to studying pseudogap physics in an attractive Hubbard system across the BEC-BCS crossover, setting the stage for future studies of the pseudogap regime in repulsive Hubbard systems. [Preview Abstract] |
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