Bulletin of the American Physical Society
2021 Joint Spring Meeting of the Texas Sections of APS, AAPT and Zone 13 of the SPS
Volume 66, Number 2
Thursday–Sunday, April 8–11, 2021; Virtual
Session C04: APS: Atomic and Molecular Physics-I |
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Saturday, April 10, 2021 10:00AM - 10:12AM |
C04.00001: Separation-dependent emission pathways of quantum emitters. Jugal Talukdar, D. Blume System-environment interactions have been studied extensively for many decades and recent developments in quantum optics and circuit QED provide intriguing possibilities for realizing non-linear environments. The Bose-Hubbard lattice for photons, e.g., has been realized experimentally using superconducting circuits, thereby providing an exciting platform to study effective interactions between quantum emitters mediated by the engineered photonic environment. We consider a collection of macroscopically separated two-level emitters coupled to a non-linear environment and study the dissipative dynamics. Specifically, we report our theoretical progress on understanding the criteria for the existence of specific emission pathways as a function of the positions of the emitters. [Preview Abstract] |
Saturday, April 10, 2021 10:12AM - 10:24AM |
C04.00002: Velocity and Temperature Evolution of Ultracold Neutral Plasmas with Exponentially Decaying Density Distributions MacKenzie Warrens, Grant Gorman, Stephen Bradshaw, Tom Killian Ultracold neutral plasmas (UNPs) occupy an exotic low-temperature and low-density regime of plasma physics, and they provide a powerful platform for studying fundamental plasma physics processes such as plasma waves, transport, and expansion into vacuum. Previous UNP experiments have used plasmas with an initial Gaussian density distribution, for which the expansion into vacuum is well understood. Another interesting initial profile is an exponentially decaying density distribution, which is formed by photoionizing atoms in a quadrupole magnetic trap. While exponential plasmas have similar characteristic length and time scales as Gaussian plasmas, and are predominantly in the hydrodynamic regime, the velocity and temperature profiles differ. This talk compares the velocity and temperature evolution of exponential and Gaussian UNPs, and examines the potential for wave breaking and shock waves in exponential UNPs. [Preview Abstract] |
Saturday, April 10, 2021 10:24AM - 10:36AM |
C04.00003: Transition Probabilities for a Relativistic One-Electron Atom Gerardo Gonzalez, Steve Alexander Using Variational Monte Carlo methods we have calculated trial wave function forms for a number of one-electrons atoms with Z$=$92. In order to incorporate relativistic effects, our trial wave functions satisfy both the 2-component Dirac equation and the 4-component Dirac equation. With these trial wave functions we have calculated a number of simple expectation values as well as several M1, E1, M2 and E2 transition probabilities. We compare our results with those of generated by other methods. [Preview Abstract] |
Saturday, April 10, 2021 10:36AM - 10:48AM |
C04.00004: H Ion Fractions Scattered from Ag(111) surfaces Bogdana Bahrim Negative hydrogen ion fractions resulted from scattering positive ions on Ag(111) surfaces are reported for a large range of incident angles, and incoming projectile energy of 1 keV. The data show a very good agreement between theoretical calculations and experimental results. The ion fraction increases with the incident angle because at steeper angles the projectile spends less time interacting with the surface, and therefore there is less electron loss. For the Ag(111) surface, a projected band gap opens between -0.6 eV and -5 eV in the direction normal to the surface. The existence of a band gap strongly affects the ion charge transfer with the surface, and therefore the behavior of ion fractions. Experimental results obtained for ion scattering on Ag(111) and polycrystalline Ag are compared and discussed. [Preview Abstract] |
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