Bulletin of the American Physical Society
19th Annual Meeting of the APS Northwest Section
Volume 63, Number 6
Thursday–Saturday, May 31–June 2 2018; Tacoma, Washington
Session F3: Atomic, Molecular, and Optical Physics |
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Chair: Brian Saam, Washington State University Room: Thompson Hall 391 |
Saturday, June 2, 2018 1:30PM - 2:00PM |
F3.00001: Single Photon Emitters in Boron Nitride Nanococoons Invited Speaker: Benjamín Alemán Quantum emitters in two-dimensional hexagonal boron nitride (hBN) are attractive for a variety of quantum and photonic technologies because they combine incredibly bright, room-temperature single-photon emission with an atomically thin crystal. However, the emitter's prominence is hindered by large, strain-induced wavelength shifts. Here, we report the discovery of single-photon emitters in boron nitride (BN) nanococoons that operate under ambient conditions. The BN nanococoon combines a bright, stable visible wavelength single-photon emitter with a zero-dimensional, nanoscale structure. Most notably, the BN nanococoon quantum emitter has an order-of-magnitude smaller wavelength variability than emitters in few-layer hBN. This low wavelength variability solves the central problem plaguing the otherwise-fantastic single photon emitters in 2D hexagonal boron nitride. Altogether, our discovery enlivens color centers in BN materials and, because of the BN nanococoon's size, opens new and exciting opportunities in nanophotonics, quantum information, biological imaging, and nanoscale sensing. [Preview Abstract] |
Saturday, June 2, 2018 2:00PM - 2:30PM |
F3.00002: The Search for Neutron EDM at TRIUMF Invited Speaker: Emily Altiere A new ultra cold neutron (UCN) facility is under development with a flagship experiment of measuring the neutron’s electric dipole moment (EDM) with a precision of 10$^{-27}$ e-cm. Construction of the main apparatus is taking place at TRIUMF, with collaborators from Japan and Canada. To measure the nEDM, a magnetic resonance experiment on polarized neutrons is performed, where the uncertainty is limited by how well the magnetic field and its gradient are known. Previous nEDM experiments relied on in-situ measurements of the magnetic field using a Ramsey fringe measurement of the spin precession of $^{199}$Hg (cohabiting with the neutrons). UCN will introduce a dual co-magnetometer with cohabiting $^{129}$Xe and $^{199}$Hg for measuring precise magnetic fields within a neutron storage cell. By simultaneously incorporating two atomic species we can deduce both the magnitude and gradient of the magnetic fields, thereby lowering the systematic uncertainties in the nEDM measurement. $^{129}$Xe was chosen for several reasons including its negligible interaction with the neutrons and $^{199}$Hg. Measuring the magnetic field using polarized $^{129}$Xe involves first spin-selectively exciting a two-photon transition -ground 5p6(1S0) state to the excited 5p$^{5}$($^{2}$P$_{3/2}$)6p state at 252 nm- and then measuring the via fluorescence decay. In my talk I will first present an overview of the Neutron EDM project (both the motivation and the production of UCN at TRIUMF). Following this review, I will discuss my contributing work on the $^{129}$Xe co-magnetometer including the analysis of the two-photon excitation spectrum, and our current progress on the measurements of precession of polarized Xe atoms. [Preview Abstract] |
Saturday, June 2, 2018 2:30PM - 3:00PM |
F3.00003: Hyperfine Physics in Alkali-Metal Vapors Invited Speaker: Brian Saam Although alkali-metals were all discovered by the mid-19th century, vapors of these Column I elements have been studied with particular intensity in the last 75 years, initially as pseudo-one-electron systems with easily accessed optical or near-infrared P$\rightarrow$S transitions to the ground state having strong oscillator strengths. Currently, they are widely used in precision magnetometry, atomic clocks, and in gyroscopes; they are also of fundamental importance in the study of cold atoms, Bose-Einstein condensates, and atom interferometry---even some table-top searches for physics beyond the standard model. All stable alkali-metal isotopes have half-integer nuclear spin, and the ground-state hyperfine coupling to the valence electron generates a rich spin physics that is crucial to all of these areas of study. Our laboratory focuses on optical pumping: the use of circularly polarized resonance light to produce large non-equilibrium ground-state spin polarization in alkali-metal vapors. We also work on the technique of spin-exchange transfer of this polarization to the nuclei of certain noble gases ($^3$He and $^{129}$Xe), which finds application to magnetic resonance imaging of the lung, among many others. We have worked most recently on characterizing electron-paramagnetic-resonance (EPR) frequency shifts in hyperfine transitions that result from interactions between the polarized alkali-metal vapor and the polarized noble-gas nuclei. These are studied optically with much higher sensitivity than inductive techniques; indeed, such shifts can be used as a sensitive probe of the noble-gas magnetization. [Preview Abstract] |
Saturday, June 2, 2018 3:00PM - 3:12PM |
F3.00004: Lattice assisted coupling in a spin-orbit coupled Bose-Einstein condensates: a pathway to generating stripe-phase like features. Vandna Gokhroo, Thomas Bersano, Sean Mossman, Peter Engels We investigate the dynamics of a spin-orbit coupled Bose-Einstein condensate in the presence of a matching lattice. The lattice wavevector is chosen such that it can couple the two minima of the spin-orbit dispersion. We observe coherent Rabi oscillations between the relevant momentum states by quenching system parameters. The ground state phase diagram as a function of tunneling strength and spin-orbit detuning is also verified experimentally and compared to theoretical predictions. The experimentally realized ground state exhibits stripe-phase like properties. I will describe the experimental scheme and current results of the project. [Preview Abstract] |
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