Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 60, Number 11
Friday–Saturday, October 16–17, 2015; Tempe, Arizona
Session K1: Atomic, Molecular and Optical Physics V |
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Chair: Scott Bergeson, Brigham Young University Room: PSH150 |
Saturday, October 17, 2015 1:12PM - 1:24PM |
K1.00001: Controlling Squeezing by Varying the Mass Parameter of an Oscillator Ty Beus, Manuel Berrondo The Caldirola-Kanai Hamiltonian (CKH) leads to the dynamics of a damped oscillator in classical mechanics. CKH has been reinterpret and studied in quantum mechanics as a harmonic oscillator with an exponentially increasing mass parameter. This system causes the oscillator state to squeeze. We explore the effects of more realistic finite and temporary mass fluctuations on the squeezing of oscillators. We find that by strategically adding Gaussian pulses to the mass value we can increase the squeezing arbitrarily. Gaussian pulses can also decrease the squeezing back to coherent states. This result points to controlled localization of position and momentum degrees of freedom of quantum systems. [Preview Abstract] |
Saturday, October 17, 2015 1:24PM - 1:36PM |
K1.00002: Displacement Pattern Enumeration for Phonon Modeling Wiley Morgan, Rodney Forcade, Gus Hart In computational material science, one frequently needs to have a list of the ``derivative superstructures'' of a given lattice. For example, many phases in metal alloys are merely ``superstructures'' of fcc, bcc, or hcp lattices (L1$_{2}$, B2, D0$_{19}$, etc.). When modeling potential alloys, one needs to explore all possible configurations of atoms. Additionally, when modeling the thermal properties of materials, it becomes necessary to know the possible ways of displacing the atoms as well.The solution to finding both all possible configurations and all possible displacements is to simply generate the complete list remove those that are symmetrically equivalent. This approach, however, suffers from the combinatoric explosion that happens when the supercell size is large, when there are more than two atom types, or more than a single displaced atom. This problem persists even when there are only a relatively small number of unique arrangements that survive the elimination process. Here, we extend an existing algorithm to include the extra degrees of freedom from the inclusion of displacements. The algorithm uses group theory to eliminate large classes of arrangements. With this approach we can now enumerate systems with atomic displacements which were previously inaccessible. [Preview Abstract] |
Saturday, October 17, 2015 1:36PM - 2:00PM |
K1.00003: Quantum Optics with Atoms and Photons Invited Speaker: FRANCISCO BECERRA CHAVEZ Quantum mechanics has changed the way we think about our world at a fundamental level. It has provided us with a better understanding of the microscopic world, and has allowed us to imagine and realize technologies that have changed the way we live. However, there is still great potential for using quantum properties of physical systems to process information much more efficiently, which could lead to the realization of information technologies outperforming conventional ones. These new technologies could, for example, allow us to communicate in an absolute secure way, or to read out information contained in physical systems with much higher fidelities than what is possible with conventional detection schemes. We study the quantum properties of light and matter to enhance the capabilities of information technologies for measurement, communication and information processing. I will discuss our advancements in the realizations of quantum measurements of states of light with overlapping quantum noise to decode information for communications. In addition, I will present our progress in the study of atom-photon interfaces for quantum information and communications. [Preview Abstract] |
Saturday, October 17, 2015 2:00PM - 2:12PM |
K1.00004: Full Band Monte Carlo Simulation of In$_{\mathrm{0.7}}$Ga$_{\mathrm{0.3}}$As Junctionless Nanowire Field Effect Transistors. Raghuraj Hathwar, Marco Saraniti, Stephen Goodnick Junctionless nanowire FETs (JNFETs) have gained popularity since its demonstration by the Tyndall Institute. The device is relatively simple to fabricate, with good scaling behavior, making it a promising next-generation technology for the end of the semiconductor roadmap. Simulations of such devices have either involved a simplified assumption on the band structure of the nanowire or by using a fully quantum mechanical approach such as the non-equilibrium Green's function (NEGF) method which is computationally expensive. In the present work we implement a full band Monte Carlo simulation coupled with a Schr\"{o}dinger solver to simulate quantum confinement effects and phonon limited dissipative transport in such devices. The Schr\"{o}dinger equation is solved by using the semi-empirical \textit{sp}$^{3}d^{5}s^{\ast }$ Tight Binding (TB) model including spin. The charge carriers are treated as particles moving freely along the axis of the nanowire and confined along the transverse directions. Polar optical phonon scattering rates and deformation potential scattering rates are calculated within the TB framework. A new way to calculate the polar optical phonon scattering rates from the TB coefficients is also presented. [Preview Abstract] |
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