Bulletin of the American Physical Society
16th Annual Meeting of the Northwest Section of the APS
Volume 60, Number 6
Thursday–Saturday, May 14–16, 2015; Pullman, Washington
Session B7: Atomic, Molecular and Optical Physics |
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Chair: Mark Kuzyk, Washington State University Room: Smith Center for Undergraduate Education (CUE) 202 |
Friday, May 15, 2015 1:30PM - 2:00PM |
B7.00001: Ultralong-range Rydberg molecules with kilo-Debye dipole moments Invited Speaker: Seth Rittenhouse In recent years, there has been a great deal of theoretical and experimental interest in ultralong-range Rydberg molecules. First proposed over 15 years ago, these molecules form due to repeated scattering of a highly excited Rydberg electron off a ground state neutral atom. They are predicted to be ultralong-range, with inter-nuclear separations on the order of 100 nanometers. When the electron has a high angular momentum, $l>2$, the electron wave function can be highly localized around the ground state atom. These molecules, called ``trilobite'' molecules, are predicted to posses extremely large electric dipole moments, on the order of kilo-Debye. In this talk I will present recent experimental and theoretical work that has resulted in the first realization of Rydberg trilobite molecules with ultra-large permanent electric dipole moments in a cold gas of Cs.\\[4pt] In collaboration with D. Booth, J. Yang, J.P. Shaffer, University of Oklahoma; and H.R. Sadeghpour, Harvard-Smithsonian Center for Astrophysics. [Preview Abstract] |
Friday, May 15, 2015 2:00PM - 2:12PM |
B7.00002: Molecular beam characterization using a laser-cooled atomic gas target Thomas Prescott, Gene Polovy, Mario Michan, Frank Stienkemeier, Eckart Wrede, Kirk Madison, Takamasa Momose Molecular beams are important experimental tools for the study of intermolecular potentials by way of collisions (both high energy and ultra-cold). In addition, molecular beams are critically important for certain semiconductor processing and fabrication applications (e.g. MBE). However, despite their wide-spread use and importance to both fundamental research and commercial applications, the absolute flux and beam profile of molecular beams is very difficult to determine due to the lack of suitable tools. The usual choice for this task is the ion gauge which suffers from a series of limitations including sensor degradation, calibration drift, and limited spatial resolution due to a large sensor area with a sensitivity that varies in an unpredictable and uncontrollable way due to dynamic variations in the electron plasma density. We present here the demonstration of an alternative, robust, and calibration free detection method that relies on a laser cooled atomic sample as the sensor element. We use it to characterize the absolute flux and beam profile of a molecular beam apparatus for noble gas beams. [Preview Abstract] |
Friday, May 15, 2015 2:12PM - 2:24PM |
B7.00003: Conductivity Manipulation through Quantum Entanglement John Paul Hansen, You Qiang Modern research has shown that single atoms of n-type semiconductors can retain the entangled spin states of photons via exciton spin, due to the exchange-interaction principle. By changing the spin states of just one the excitons via photo-stimulation, both of the materials' conductivities can be altered non-locally. In our experiment, two bulk cadmium sulphide (CdS) samples were placed in classically separated environments and then excited by two separate beams of entangled light produced in beamlike generation. Although classically isolated, both samples had simultaneous responses to a photostimulation made on just one sample. The conductivity of the excited sample was found to be proportional to that of the second sample, times a predictably fluctuating scalar. Each excited sample datum corresponds with an accuracy of 99.8{\%} to those of the responding sample, by the scalar, and can only be predicted with respect to the responding sample resistivity. These results indicate an entangled connection of the majority of the electrons in the bulk CdS, and suggest that the conductivities of two separated bulk n-type semiconductors can become mutually dependent, and subject to nonlocal manipulation through quantum entanglement. [Preview Abstract] |
Friday, May 15, 2015 2:24PM - 2:36PM |
B7.00004: Time-Domain Simulati0ns of the Hyperpolarizability Dennis Sullivan, Sean Mossman, Mark Kuzyk The first hyperpolarizability of a quantum system is the fundamental building block of the nonlinear response of a material to high intensity light, which is the basis for a broad range of phenomena, devices, and applications. However, analytic solutions are rarely available. We present a simulation method based on the finite difference time-domain (FDTD) method which can determine the hyperpolarizablitiy of three-dimensional structures. The accuracy of the method is demonstrated on a clipped harmonic oscillator structure for which analytic solutions are known making it possible to determine the accuracy of the result. [Preview Abstract] |
Friday, May 15, 2015 2:36PM - 2:48PM |
B7.00005: Optical Signatures of Disordered Materials Hergen Eilers, Benjamin Anderson, Ray Gunawidjaja Many security applications require tamper-indicating seals for authenticity verification. Recent approaches focus on storing information (anti-evidence) at the time of seal preparation. Missing anti-evidence indicates that tampering occurred. We design, prepare, characterize, and evaluate optically disordered materials for potential authentication applications. These materials consist of composites containing polymers, scattering particles, and sometimes fluorescent dyes. We then use a spatial light modulator to modulate the phase of a laser beam in conjunction with a microgenetic-algorithm-based feedback loop to identify a unique optical signature for the disordered material. Reflectance, transmittance, fluorescence, random lasing, and many other approaches can be used to determine an optical signature for the disordered material. Tampering will disturb the specific disorder of the material and destroy the optical signatures. For remote applications, this approach can be combined with quantum-secure approaches. We will present modeling and experimental results for transmission and reflectance measurements, including focusing light through optically-opaque materials. [Preview Abstract] |
Friday, May 15, 2015 2:48PM - 3:00PM |
B7.00006: The Aparticle Hypothesis, Locality, and Gravitation Michael Devine A novel hypothetical fundamental element of reality is presented. This element, a bi-partite system of relativistically anti-correlated definite states (referred to as an ``aparticle''), along with a local quasi-Lagrangian, is shown capable of explaining the observation of quantum teleportation without the necessity of superluminal effects. Thus, the element provides a prospective resolution to the open question of locality. Further, gravitation can be derived from the hypothesis and thus the hypothesis offers a potential pathway toward a quantized theory of gravity. The veracity of the model may be experimentally testable in a modified EPRB experiment in which the outcome predicted by the hypothesis differs from the prediction of quantum mechanics. [Preview Abstract] |
Friday, May 15, 2015 3:00PM - 3:12PM |
B7.00007: Saddlepoint Search: Continuous Dimer Method Ethan Crowell, Michael Forbes Determining saddle points for a given potential or energy functional is of interest in the study of transition pathways in various fields (chemistry, nuclear fission, etc.) However, this can be quite difficult for many body systems. Henkelman \textit{et al} developed a dimer method for doing this that uses only the first derivatives of the potential, thus making the method scale well with the number of dimensions of the system. Here we develop a continuous extension of the dimer method so that the evolution is unitary. This allows us to apply the dimer method to energy functionals of particle density without having to reorthogonalize or renormalize the wavefunctions. [Preview Abstract] |
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