Program - Physics & Astronomy - Stephen F. Austin State University

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femtosecond Coherent Anti-Stokes Raman Scattering (CARS)technique. CARS signal profiles for high-frequency Ramantransitions in methanol and ethanol, as representative simpleorganic substances, are obtained. The detailed, good-visibilityprofiles, spanning six decades in signal magnitude, show clearlow-frequency oscillations, attributed to quantum beats, andmake it possible to extract decoherence time constants. Nontrivialdependence of these constants on methanol/ethanolconcentration in water solution is observed. Coherent responsefrom a saturated solution of dipicolinic acid, which has muchmore complex molecular structure, is also demonstrated.3:18 pm - AA-8 - Switchable Diffraction GratingsHolographically Formed in Polymer-Dispersed LiquidCrystal Cells Using He-Ne Laser, Robert Ramsey,robertramsey@uta.edu, Suresh Sharma, sharma@uta.edu,University of Texas at Arlington. We report on the holographicformation of switchable diffractive transmission gratings inpolymer-dispersed liquid crystal cells by using the 632.8 nmwavelength of He-Ne laser. We present results for the microstructure,diffraction efficiency and switching characteristics forgratings utilizing E8 liquid crystal along with monomers havingvarying values of functionality and chemical makeup. Formonomers having high values of functionality we note a largeincrease in diffraction efficiency up to 67% while at the sametime an increase in the switching fields required to have aswitchable grating are 8 MV/m.The thermal stability and interfacial diffusion and reaction ofRuO 2 on Hf x Si 1-x O 2 /Si gate dielectric were investigated usingRutherford Backscattering Spectrometry (RBS) and SEM. Anoverview of RuO 2 / Hf x Si 1-x O 2 /Si interface integrity and pinholeformation issues will be presented.3:54 pm - AA-11 - Drell-Yan Physics at Fermilab: Past andFuture, L. Donald Isenhower, isenhowe@acu.edu, AbileneChristian University. The study of the Drell-Yan process hasyielded a number of important results that have improved ourunderstanding of the light quark sea of the proton. FermilabE866/NuSea performed the first measurements of the absoluteDrell-Yan cross section in proton-proton collisions over a broadkinematic region, and the most extensive study to date of theDrell-Yan cross section in proton-deuterium collisions. It alsomade the first measurement of this cross section ratio of protonprotonto proton-deuterium collisions over a large kinematicrange, allowing the extraction of the ratio of anti-down to anti-upquark in the proton. After reviewing E866 results and theircontributions to various areas, such as structure functioncalculations, the plans for E906, which will utilize the FermilabMain Injector will be discussed. The lower energy of the MainInjector provides a higher Drell-Yan cross section, allowing theextension of to higher Bjorken-x where E866 hints of possiblecontinued departure from unity of the d/u anti-quark ratio. Otherimportant physics questions that E906 will pursue will also bediscussed.3:30 pm - AA-9 - UV-Ozone Oxidation of Ultra Thin RuLayers, ChangDuk Lim, cl0107@unt.edu, Vaishali Ukirde,vaishali@unt.edu, Dept. of Materials Science, University ofNorth Texas, Oliver Chyan, Dept. of Chemistry, University ofNorth Texas, Mohamed El Bouanani. Ruthenium and its oxidesand nitrides are potential candidates for number of advancedapplications in Silicon based semiconductor technology such asmetal-based gate electrodes and diffusion barriers for copperinterconnects. This is due to their good thermal stability, lowresistivity, suitable work function and diffusion barrierproperties. Physico-chemical and electrical properties of Ruoxides are intimately dependent on the oxide preparation methodmainly due to the resulting microstructure, oxidation state andimpurities/contaminants. 5 to 7 nm Ru films were deposited onSi and SiO 2 substrates by DC magnetron sputtering in Aratmosphere. The films were then exposed to UV/Ozone radiationand oxygen at room temperature for a duration ranging from 15min to 60 min. In-situ X-ray photoelectron spectroscopy (XPS)is used to investigate Ru oxidation rate and the bondingenvironment. A comparison with Ru oxide prepared via reactiveDC sputtering in an Ar/O 2 mixture will be presented.4:06 pm - AA-12 - An Investigation of the Canis MajorDwarf Galaxy, William Lee Powell Jr.,William.L.Powell@ttu.edu, Ron Wilhelm,Ron.Wilhelm@ttu.edu, Amy Westfall, Adam Lauchner, AbelDiaz, Texas Tech University. Martin et al. (2004) uncoveredevidence for a remnant dwarf galaxy in Canis Major. Martin, etal. discovered an overdensity of M-giant stars using 2MASScolors. The spatial distribution of the M-giants indicate thatCanis Major is an extended, and likely disrupted, group of starsthat that are centered at a distance moduli of (m-M) = 15.8 andextending over roughly 30 degrees. This discovery is not withoutcontroversy. Momany et al. (2004) found that the proper motionsof the M-giants in the direction of Canis Major are consistentwith the thick disk of the Galaxy, but also found modelednumber densities for these stars that are consistent with the warpand flaring of the outer disk of our Galaxy. This led Momany etal. to the conclusion that Martin et al. were actually observingthe outer warp of our Galaxy. We made a photometric survey tofind candidates of the Canis Major galaxy which could belong tothe horizontal branch of the galaxy. We then obtainedspectroscopy of these stars in order to determine luminosityclass, metal abundance and distance estimates. The goal was tofind a group of horizontal branch stars, as is expected for an oldpopulation, in the Canis Major dwarf. This would haveramifications for our understanding of the thick disk populationin our Galaxy.3:42 pm - AA-10 - Interfacial Stability of RuO 2 onHf x Si 1-x O 2 /Si, Vaishali Ukirde, vaishali@unt.edu, ChangdukLim, Manuel Quevedo-Lopez, Mohamed El Bouanani, Dept. ofMaterials Science, University of North Texas. Alternative metalbasedgate electrodes are currently under consideration as areplacement of Poly-Si gates. Metal gates are required to 4:18 pm - AA-13 - Possible Applications and Limitations ofmaintain scaling and performance of future CMOS devices. Ru Multi-Walled Carbon Nanotubes to Solar Energybased compounds are potential gate electrode candidates for Conversion, Robert Friedfeld, rfriedfeld@sfasu.edu, Stephen Ffuture metal-oxide-semiconductor (MOS) devices. RuO 2 , with Austin State University. Recent experimental work has shownthickness of 500Å were deposited on Hf x Si 1-x O 2 /Si structures by that multi-walled carbon nanotubes (MWCNT) can behave likeDC sputtering. These structures were annealed in flowing N 2 receiving antennas for visible light [1]. One possible applicationatmosphere at temperatures ranging from 800 °C to 1000 °C. for this newly observed behavior for carbon nanotubes might be24
for solar energy conversion. Potential applications andlimitations of this technology to solar energy conversion will bediscussed. 1. Y. Wang et al., Applied Physics Letters, Vol. 85,No. 13, 2004.4:30 pm - AA-14 - Study of the Acridine Labeled Short DNA-Duplexes by Means of Rotational Depolarization ofFluorescence, Alexey Chugreev, chugreev@tamu.edu, TexasA&M University, Alexander Ogrodnik,alexander.ogrodnik@ch.tum.de, Technical University ofMunich. Dye-DNA compounds have attracted much interest inthe quest of potentialities for cancer treatment and serve as veryversatile workbenches for exploring the basics of molecular wiretechnology. For such studies exact positioning of a dye withinthe sequence is crucial, and can be achieved by a flexiblecovalent link. Proper intercalation of such a dye can be tested bymonitoring the inclination angle of the transition moment withthe spinning axis of short DNA double helices by means ofrotational depolarization of the dye fluorescence. For 9-amino-6-chloro-2-methoxyacridine attached with a tetramethylenelinker at an abasic L-threoninol site we found this angle to belarger than 70 degrees. Since the fluorescence is quantitativelyquenched in sequences with guanine neighboring the linker site,these results suggest complete intercalation of the dye.4:42 pm - AA-15 - Oxidation of Hafnium as Studied byX-ray Photoelectron Spectroscopy, Supported by OrganizedResearch, TAMU-Commerce, A Chourasia,Anil_Chourasia@tamu-commerce.edu, Richard Miller,Anil_Chourasia@tamu-commerce.edu, Texas A&M Univ-Commerce. Thin films of hafnium were deposited on stainlesssteel substrate at various temperatures in an oxygen atmosphere.The technique of X-ray photoelectron spectroscopy was used tostudy the oxidation of hafnium. The zirconium anode (energy =2042.4 eV) was used as the source of excitation. The 3d corelevels of hafnium (energy ∼1660 eV) and the x-ray excited MNNAuger region of hafnium were investigated. The Augerparameter was determined from the core levels and the mainpeak in the Auger region. The data are correlated with theoxidation of hafnium as a function of the temperature. Thethickness of the oxide films were determined by using theQUASES software. The dependence of the film thickness on thesubstrate temperature will be presented.Session AB1:30 pm - AB-1 - Euclidean, Lorentzian, and Physical Time,Roland Allen, allen@tamu.edu, Zorawar Wadiasingh,zorawar@neo.tamu.edu, Texas A&M University. Lorentziantime is the time which occurs in the standard equations ofphysics, with a different status than a spatial coordinate x.Euclidean time is obtained from Lorentzian time by a Wickrotation in the complex t plane, and enters into the resultingequations exactly in the same way as a spatial coordinate x. Itseems obvious that the physical time we experience must beLorentzian time, and that Euclidean time is just a mathematicalartifice which we employ for convenience in calculations.However, Hawking has suggested, in both his popular book (“ABrief History of Time”) and in a more technical context(“Euclidean Quantum Gravity”) that exactly the opposite may betrue: Euclidean time may be more fundamental, making quantum25mechanics formally identical to statistical mechanics, andLorenzian time is introduced by human observers because it ismore convenient for calculations. We present an argument,based on the path integral formulation of quantum mechanics,which supports this latter point of view. In addition, we proposethat the breaking of the symmetry between space and time has asimple cosmological origin.1:54 pm - AB-3 - Temperature Difference InducedEntanglement of a Two-Level Atom and a Thermal Field,Han Xiong, hxiong@tamu.edu, Fuli Li, flli@tamu.edu, M.S.Zubairy, zubairy@physics.tamu.edu, Institute for QuantumStudies and Department of Physics, Texas A&M University,Texas 77843, USA. The interaction of a two-level atom and afield which are both initially prepared in thermal states has beenstudied by use of the Jaynes-Cummings model. We show thatentanglement between the atom and the field can arise when thetemperature difference between them are sufficiently large. Thisentanglement cannot be created when the atom and the field arein thermal equilibrium, however, a unitary transformation canalways be applied on the atom to destroy the thermal equilibriumand thus create entanglement.2:06 pm - AB-4 - Cavity QED Implementation of ThreeQubit Quantum Phase Gate, Juntao Chang,jchang@physics.tamu.edu, Suhail Zubairy, Department ofPhysics and Institute for Quantum Studies, Texas A&MUniversity. We describe a three qubit quantum phase gate inwhich the three qubits are represented by the photons in a threemodesoptical cavity. This gate is implemented by passing afour-level atom in a cascade configuration through the cavity.We shall discuss the application of such a quantum phase gate toquantum searching.2:18 pm - AB-5 - Generation of Arbitrary Two-QubitEntangled States in Cavity QED, Tiegang Di, tiegangdi@neo.tamu.edu,M. Suhail Zubairy,zubairy@physics.tamu.edu, Department of Physics and Institutefor Quantum Studies, Texas A&M University. We propose howto prepare arbitrary two-mode entangled photon states usingatomic interactions with classical fields and quantized cavityfields.2:30 pm - AB-6 - Propagation of Broad Spectrum Pulse inEIT Medium, Qingqing Sun, qsun@physics.tamu.edu, YuriRostovtsev, rost@physics.tamu.edu, Department of Physics,Texas A&M University, Jonathan Dowling,jdowling@phys.lsu.edu, Department of Physics & Astronomy,Louisiana State University, M. Suhail Zubairy,zubairy@physics.tamu.edu, Department of Physics, Texas A&MUniversity. We investigate the possibility of broad spectrumpulse propagation in an electromagnetically inducedtransparency (EIT) medium without large distortion. The pulse isseparated into different spectrum bands. Each band propagates inan EIT window whose center is adjusted to the band center.After proper phase compensations these bands are recombined.The outcoming pulse suffers little distortion and absorption,compared to the propagation in one EIT window. Using thismethod we can remove the restriction to pulse width in slowlight experiments.
Page 1 and 2: SPRING 2005 MEETINGTexas Section of
Page 3 and 4: Meeting ScheduleThursday, March 3 E
Page 5 and 6: Session SchedulesFriday8:30-8:45 am
Page 7 and 8: APS Contributed PapersFriday Aftern
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Page 11 and 12: AAPT Contributed PapersAAPTFriday A
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Page 19 and 20: FRIDAY AFTERNOON: 2:30pm - 4:30pmTS
Page 21 and 22: ExhibitorsExhibitorsFriday 1:00-5:0
Page 23: mat/0411487 [2] Phys. Rev. Lett. 94
Page 27 and 28: associated with atmospheric fluctua
Page 29 and 30: 4:30 pm - AAPT-14 - Electronic Clas
Page 31 and 32: AC-3 - Phase Identification for Cu-
Page 33 and 34: optimizing the laser pulses that ar
Page 35 and 36: NacogdochesThe Oldest Town in Texas
Page 37 and 38: Meeting Notes37

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