Bulletin of the American Physical Society
84th Annual Meeting of the APS Southeastern Section
Volume 62, Number 13
Thursday–Saturday, November 16–18, 2017; Milledgeville, Georgia
Session F3: Atomic, Molecular, and Optical Physics |
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Chair: John Yukich, Davidson College Room: MSU Building Donohoo Lounge |
Friday, November 17, 2017 11:00AM - 11:12AM |
F3.00001: Energy flow of electric dipole radiation between parallel mirrors Zhangjin Xu, Henk F. Arnoldus We have studied the energy flow patterns of the radiation emitted by an electric dipole located between parallel mirrors. It appears that the field lines of Poynting vector can have very intricate structures, including many singularities and vortices. The flow line patterns depend on the distance between the mirrors, the distance of the dipole to one of the mirrors and the angle of oscillation of the dipole moment. For the simplest case of a dipole moment oscillating perpendicular to the mirrors, singularities appear at regular intervals along the direction of propagation. For a dipole oscillating under a finite angle with the surface normal, the radiation tends to swirl around the dipole before travelling off parallel to the mirrors. For relatively large mirror separations, vortices appear in the pattern. When the dipole is off-centered with respect to the midway point between the mirrors, the flow line structure becomes more complicated, with many vortices in the pattern, and tiny loops near the dipole. We have also investigated the locations of the vortices and singularities, and these can be found without any specific knowledge about the flow lines. This provides an independent means of studying the propagation of dipole radiation between mirrors. [Preview Abstract] |
Friday, November 17, 2017 11:12AM - 11:24AM |
F3.00002: Measuring Core Polarizability Of $^{87}$RB Using RF Spectroscopy Of Rydberg States Seth Berl, Charles Sackett, Thomas Gallagher The core electrons make a significant contribution to the total electric polarizability $\alpha$ of large atoms like Rb. If the core contribution can be determined accurately, the remaining valence contribution to $\alpha$ provides constraints on the wave function and matrix elements of the valence electron, which can be useful for interpreting experiments such as parity violation or radiation shifts in atomic clocks. We report here on a direct measurement of the core polarizability based on radio-frequency spectroscopy of Rydberg states with large angular momentum. With an anticipated accuracy in $\alpha$ approaching 0.01 atomic units, the residual uncertainty will be negligible even in the most sensitive applications. The measured value can also be compared to high-precision theoretical calculations to test many-body techniques. [Preview Abstract] |
Friday, November 17, 2017 11:24AM - 11:36AM |
F3.00003: Atom Pairing in Optical Superlattices Jayampathi Kangara, Chingyun Cheng, Saeed Pegahan, Ilya Arakelyan, John Thomas We study the pairing of fermions in a one-dimensional optical superlattice of tunable double-well potentials using radio frequency spectroscopy. The observed spectra reveal the coexistence of two types of atom pairs with different symmetries for their center of mass wave functions. Our measurements are in excellent quantitative agreement with the predicted spectra comprising hundreds of discrete transitions, with symmetry-dependent initial state populations and transition strengths. Our work provides an understanding of the elementary pairing states in a superlattice, paving the way for new studies of strongly interacting many-body systems. [Preview Abstract] |
Friday, November 17, 2017 11:36AM - 11:48AM |
F3.00004: Observing spin-energy correlation in weakly interacting Fermi gases. Saeed Pegahan, Jayampathi Kangara Mudiyanselage, Ilya Arakelyan, John E Thomas Active manipulation of electron spin and spin current can be used to transport information with low dissipation and for creating quantum-entangled states. We study the formation of spin-energy correlations in a very weakly interacting Fermi gas of ${ }^{6}Li$ contained in an optical trap with a spin-dependent potential. In the experiments, a uniform cloud containing a coherent superposition of spin states is created by radio-frequency pulse. After 800 ms, we observe spontaneous spatial separation of the spin-up and spin-down density profiles, for both quantum-degenerate and thermal Fermi gases. These results are explained by a collision-less mean-field model of spin-energy correlation. We also determine the temperature dependence of the magnetic field at which the s-wave scattering length vanishes and spin segregation ceases, providing new constraints on models of the molecular potentials. [Preview Abstract] |
Friday, November 17, 2017 11:48AM - 12:00PM |
F3.00005: Laser Spectroscopy of Atomic Gadolinium. Upendra M. Adhikari, Clayton E. Simien Lanthanide elements are of interest because of their potential for investigating next generation optical clock transitions, novel non-S ground state ultracold collisions, and the physics of quantum degenerate dipolar gases. We present our results using laser spectroscopy to measure the isotope shifts and Zeeman spectra for potential laser cooling transitions of atomic gadolinium. These results will allow us to implement laser cooling and trapping of atomic gadolinium. [Preview Abstract] |
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