Bulletin of the American Physical Society
2011 Fall Meeting of the APS Ohio-Region Section
Volume 56, Number 8
Friday–Saturday, October 14–15, 2011; Muncie, Indiana
Session EC: Condensed Matter Physics I |
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Chair: Eric Hedin, Ball State University Room: Cooper Science CN160 |
Saturday, October 15, 2011 8:30AM - 8:45AM |
EC.00001: Spin Polarization through Series Coupled Aharonov-Bohm Rings with Double Quantum Dots Eric Hedin, Yong Joe, Jim Cutright Two co-planar Aharonov-Bohm (AB) rings with a quantum dot (QD) embedded in each arm are coupled together in series. The energy levels of the four QD's are Zeeman-split by means of an external magnetic field applied parallel to the plane of the rings, introducing up to 8 transmission resonances, including Fano-type resonances. The tight-binding formalism is used to calculate the electron transmission through the device as a function of energy and other system parameters. The differential spin polarization is determined from the transmission through the spin-split QD energy levels and shows the degree of polarization that is attainable with such a multiply-connected nano-device. [Preview Abstract] |
Saturday, October 15, 2011 8:45AM - 9:00AM |
EC.00002: Resonant Transmission of Electron Spin States through Multiple Aharonov-Bohm Rings Jim Cutright, Eric Hedin, Yong Joe An Aharonov-Bohm (AB) ring with embedded quantum dots (QD) in each arm and one -dimensional nanowires attached as leads acts as a primitive cell in this analysis. When a tunable, external magnetic field is parallel to the surface area of the ring it causes Zeeman splitting in the energy levels of the QDs. An electron that traverses these energy levels has the potential to interfere with other electrons and to produce spin polarized output. It is already known that upon output the transmission of the electrons through this system will have a resonant peak at each Zeeman split energy level. A system where multiple AB rings are connected in series is studied, to see how having the electrons pass through multiple, identical rings effects the resonant peaks in the transmission and the degree of spin polarization. [Preview Abstract] |
Saturday, October 15, 2011 9:00AM - 9:15AM |
EC.00003: Nearest-neighbor inter-strand coupling effects on electron transport through DNA molecules Sadeq Malakooti, Eric Hedin, Yong Joe In this research, an updated tight binding model including nearest-neighbor inter-strand hopping (NIH) strengths for quantum mechanical electron transport through double-stranded DNA molecules is proposed. The motivation for including these additional couplings is their similar hopping mechanism for electron tunneling in computations of DNA electron transport. Results are examined for a 30 base-pair, poly(G)--poly(C) DNA molecule which demonstrates the effects of NIH strengths on energy transmission and current-voltage (I-V) characteristics. It is found that enhancement of transmission spectra is observed with these couplings, and subsequent novel features are revealed on the I-V characteristics under various electrode-molecule contact conditions. [Preview Abstract] |
Saturday, October 15, 2011 9:15AM - 9:30AM |
EC.00004: Electron Transport through DNA Molecules with Magnetic Field Effects Gage Decker, Eric Hedin, Yong Joe Using the tight-binding formalism, a simplified model of the DNA molecule is analyzed and electron transmission plots as a function of molecular parameters are presented. In addition the Aharonov-Bohm effect is used to study the influence of an external magnetic field on electron transport through the modeled DNA Molecule. Data on the minimum flux necessary to produce a resonant change in the electron transmission will be presented. Contour plots of transmission versus flux and energy will be shown, and current-voltage curves for selected cases will be included. Applications of this work include possible tools for DNA base-pair sequencing, identifying point-mutations in DNA, and utilizing synthetic DNA in nano-electronic devices. [Preview Abstract] |
Saturday, October 15, 2011 9:30AM - 9:45AM |
EC.00005: Thermal Transport in Carbon Nanotubes using Molecular Dynamics Andrew Moore, Mahfuza Khatun We will present results of thermal transport phenomena in Carbon Nanotube (CNT) structures. CNTs have many interesting physical properties, and have the potential for device applications. Specifically, CNTs are robust materials with high thermal conductance and excellent electrical conduction properties. A review of electrical and thermal conduction of the structures will be discussed. The research requires analytical analysis as well as simulation. The major thrust of this study is the usage of the molecular dynamics (MD) simulator, LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator). A significant investigation using the LAMMPS code is conducted on the existing Beowulf Computing Cluster at BSU. NanoHUB, an open online resource to the entire nanotechnology community developed by the researchers of Purdue University, is used for further supplementary resources. Results will include the time-dependence of temperature, kinetic energy, potential energy, heat flux correlation, and heat conduction. [Preview Abstract] |
Saturday, October 15, 2011 9:45AM - 10:00AM |
EC.00006: The Least Particle Theory Robert Hartsock The Least Particle Theory states that the universe was cast as a great sea of energy. MaX Planck declared a quantum of energy to be the least value in the universe. We declare the quantum of energy to be the least particle in the universe. Stephen Hawking declared quantum mechanics to be of no value in todays gross mechanics. That's like saying the number 1 has no place in mathematics. [Preview Abstract] |
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