Bulletin of the American Physical Society
Fall 2010 Meeting of the New England Section of APS
Volume 55, Number 13
Friday–Saturday, October 29–30, 2010; Providence, Rhode Island
Session E1: APS Contributed Session I |
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Room: Barus and Holley 160 |
Saturday, October 30, 2010 8:00AM - 8:20AM |
E1.00001: Rectification in Doped Mott Insulators Junctions Florian Sabou, John Marston We discuss junctions made from doped Mott insulators [1] as a way to achieve rectification at high frequencies. To simulate such a junction we use a model of spinless electrons moving in one dimension, the t-V chain, and control the chemical potential on the two halves of the chain to create a p-n junction [2]. For short chains the many-body Schrodinger equation can be integrated numerically exactly, and we find that when subjected to an oscillating electromagnetic field such a device exhibits rectification with a preferred direction for charge transfer. Rectification is a function of both the frequency and the size of the oscillating electric field. \\[4pt] [1] J. Orenstein and A. Vishwanath, ``Doped Mott Insulators. Breaking through to the other side,'' Nature Physics 6, 566 (2010).\\[0pt] [2] E. Manousakis, ``Photovoltaic effect for narrow-gap Mott insulators,'' Phys. Rev. B82, 125109 (2010. [Preview Abstract] |
Saturday, October 30, 2010 8:20AM - 8:40AM |
E1.00002: Gravitational Wave Emission from the Single-Degenerate Channel of Type Ia Supernovae Robert Fisher, David Falta, Gaurav Khanna The thermonuclear explosion of a C/O white dwarf as a Type Ia supernova (SN Ia) generates a kinetic energy comparable to that released by a massive star during a SN II event. Current observations and theoretical models have established that SNe Ia are asymmetric, and therefore -- like SNe II -- potential sources of gravitational wave (GW) radiation. We explore detonation-powered GWs as a potential probe of the explosion mechanism of SNe Ia. We establish an upper-bound GW amplitude and expected frequency range based upon the nearly-universal energetics and nucleosynthetic yields of SNe Ia. We calculate a refined estimate of the GW signal from the single-degenerate channel of SNe Ia using three-dimensional hydrodynamical simulations that undergo a gravitationally-confined detonation (GCD). The GCD mechanism predicts a strongly-polarized GW signal from the single-degenerate channel of SNe Ia that would be detectable in the band around 1 Hz from planned GW observatories, at distances up to several Mpc. If observable, GWs may offer a direct probe into the first few seconds of a SN Ia, and yield insights into its underlying detonation mechanism not possible in the optical portion of the spectrum. [Preview Abstract] |
Saturday, October 30, 2010 8:40AM - 9:00AM |
E1.00003: Statistical Equilibria of Turbulence on Surfaces of Different Symmetry Wanming Qi, John Marston We test the validity of statistical descriptions of freely decaying two-dimensional turbulence by performing direct numerical simulations (DNS) of the Euler equation with hyperviscosity on two surfaces of different symmetry, namely, the square torus and the sphere. DNS shows, at long times, a dipolar coherent structure in the vorticity field on the torus but a quadrapole on the sphere [1]. We look for a theoretical explanation in the truncated Miller-Robert-Sommeria theory that conserves the fine-grained enstrophy, while also respecting conservation laws that reflect the symmetry of the domain. This theory is shown to be equivalent to the phenomenological minimum-enstrophy principle [2]. Finally, the theoretical results agree with DNS, and the calculation reveals how the conservation of zero angular momentum forces the sphere to have one more dipole pair than on the torus. \\[4pt] [1] J. Y-K. Cho and L. Polvani, ``The emergence of jets and vortices in freely evolving, shallow water turbulence on a sphere,'' Phys. Fluids 8, 1531 (1996). \\[0pt] [2] A. Naso, P. H. Chavanis, and B. Dubrulle, ``Statistical mechanics of two-dimensional Euler flows and minimum enstrophy states,'' Eur. Phys. J. B (2010). [Preview Abstract] |
Saturday, October 30, 2010 9:00AM - 9:20AM |
E1.00004: Hyperfine Interaction Estimation of Nitrogen Vacancy Center in Diamond Yutaka Shikano, Shu Tanaka A nitrogen vacancy center, NV center, in diamond is studied as a promising candidate for a qubit in quantum information technology, especially as quantum storage devices, since the electron spin can be optically initialized, read out and transferred its quantum information to the C$^{13}$ nuclear spin by the hyperfine interaction. However, it is difficult to evaluate the hyperfine interaction when we do not know the relative position of the C$^{13}$ nuclear spin. We theoretically propose a new experimental protocol using the weak measurement technique without knowing the relative position of the nuclear spin. In this presentation, we will present its advantage and the extension to the quantum media conversion systems. [Preview Abstract] |
Saturday, October 30, 2010 9:20AM - 9:40AM |
E1.00005: Controllable binding of polar molecules and meta-stable of 1-D dipolar gases with attractive dipole forces Robin Cote The recent achievements in the formation and manipulation of ultracold polar molecules have opened the gate to exciting new studies in several fields of physical sciences. Polar molecules could find uses in quantum information science and in precision measurements while dense samples could provide a fertile ground for novel quantum gases because of their long-range and anisotropic interactions. Until now, stable dipolar gases were though to require a repulsive dipole-dipole interaction, such as provided by dipoles aligned and perpendicular to the vector joining them. However, to observe interesting new correlations and condensed matter phases, attractive interactions are needed. Here, we explore how meta-stable one-dimensional (1-D) samples of ultracold polar molecules could be created with attractive long-range dipole-dipole interaction. We show that a repulsive barrier due to a strong quadrupole interaction can stabilize a gas of ultracold KRb molecules and even lead to long-range wells supporting bound states. The properties of these wells can be controlled by external electric fields, allowing the formation of long chains of KRb polymers, and the further study of Luttinger liquid transition. [Preview Abstract] |
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