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You searched on: Topic Area: Condensed Matter Physics Sorted by: date

Displaying records 21 to 30 of 34 records.
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21. Effects of disorder and internal dynamics on vortex wall propagation
Topic: Condensed Matter Physics
Published: 5/26/2010
Authors: Hongki Min, Robert D McMichael, Michael J Donahue, Jacques Miltat, Mark D Stiles
Abstract: Experimental measurements of domain wall propagation are typically interpreted by comparison to ideal models that ignore the effects of extrinsic disorder and the internal dynamics of domain wall structures. Using micromagnetic simulations we study v ...

22. Interference of Single Photons from Two Separate Semiconductor Quantum Dots
Topic: Condensed Matter Physics
Published: 4/1/2010
Authors: Edward B. (Edward) Flagg, Andreas Muller, Sergey V Polyakov, Alexander E. Ling, Glenn Scott Solomon
Abstract: We demonstrate and characterize interference between discrete photons emitted by two separate semiconductor quantum dot states in different samples excited by a pulsed laser. Their energies are tuned into resonance using strain. The photons hav ...

23. Characterization of Soluble Anthradithiophene Derivatives
Topic: Condensed Matter Physics
Published: 3/18/2010
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, John E Anthony, David J Gundlach
Abstract: We will discuss the growth and electrical measurements of a newly developed, partially fluorinated anthradithiophene (F-ADT) derivative with tert-butyldiphenylsilyl (TBDMS) side groups. Single crystals of the material can be readily grown and device ...

24. Spin-transfer dynamics in spin valves with out-of-plane magnetized CoNi free layers
Topic: Condensed Matter Physics
Published: 1/29/2010
Authors: William H Rippard, Alina M Deac, Matthew R Pufall, Justin M Shaw, Mark W Keller, Stephen E Russek, Gerrit E Bauer, Claudio Serpico
Abstract: We have measured spin-transfer-induced dynamics in magnetic nanocontact devices having a perpendicularly magnetized Co/Ni free layer and an in-plane magnetized CoFe fixed layer. The frequencies and powers of the excitations agree well with the predic ...

25. Effects of magnetism and electric field on the energy gap of bilayer graphene nanoflakes
Topic: Condensed Matter Physics
Published: 1/13/2010
Author: Hongki Min
Abstract: We study the effect of magnetism and perpendicular external electric field strengths on the energy gap of length confined bilayer graphene nanoribbons (or nanobars) using a first principles density functional electronic structure method and a semi-lo ...

26. Electrical Characterization of Soluble Anthradithiophene Derivatives
Topic: Condensed Matter Physics
Published: 11/19/2009
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, John E Anthony, David J Gundlach
Abstract: Organic semiconductors remain an active subject for device physics and material science because of their varied electrical properties and potential for low-cost, high-throughput roll-to-roll processing. Several high-mobility oligomers, such as pen ...

27. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Condensed Matter Physics
Published: 8/6/2009
Authors: Hongki Min, Allan H. MacDonald
Abstract: We predict that the optical conductivity of normal graphene multilayers is close to {sigma}^duni^=({pi}/2) e^u2^/h per layer over a broad range of frequencies. The origin of this behavior is an emergent chiral symmetry which is present in normal N-l ...

28. The-Final-State Symmetry of Na 1s Core-shell Excitons in NaCl and NaF
Topic: Condensed Matter Physics
Published: 7/8/2009
Authors: Eric L Shirley, K. P. Nagle, G T Seidler, T. T. Fister, J. A. Bradley, F. C. Brown
Abstract: We report measurements of the Na 1s contribution to the nonresonant inelastic x-ray scattering (NRIXS) from NaCl and NaF. Prior x-ray absorption studies have observed two pre-edge excitons in both materials. The momentum transfer-dependence (q-depe ...

29. Josephson phase qubit circuit for the evaluation of advanced tunnel barrier materials
Topic: Condensed Matter Physics
Published: 11/21/2008
Authors: Jeffrey S. Kline, Haohua Wang, Seongshik Oh, John M Martinis, David P Pappas
Abstract: We have found that crystalline Josephson junctions have critical current density control problems which decrease circuit yield. We present a qubit circuit designed to accommodate a factor-of-five variation in critical current density for the evaluati ...

30. Ultra-high resolution alpha particle spectroscopy using calorimetry
Topic: Condensed Matter Physics
Published: 9/23/2008
Authors: Robert Daniel Horansky, Joel Nathan Ullom, James A Beall, Gene C Hilton, Kent D Irwin, Don Dry, Beth Hastings, Stephen Lamont, Clifford R Rudy, Michael W Rabin
Abstract: Calorimetry has been used since the late 1700?s to measure the heat output of physical processes ranging from chemical reactions to the respiration of organisms . Calorimetry is performed by measuring the temperature change caused by heat release int ...

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