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Topic Area: Condensed Matter Physics
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Displaying records 21 to 30 of 110 records.
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21. Dipole Moment of a Pb-O Vacancy Pair in PbTiO^d3^
Topic: Condensed Matter Physics
Published: 4/1/2004
Authors: Eric J Cockayne, Benjamin P Burton
Abstract: The polarization of a nearest-neighbor (nn) Pb-O vacancy pair in PbTiO3 is calculated, using the modern theory of polarization, implemented in the density functional theory ultrasoft pseudopotential formalism. The dipole moment per divacancy is about ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850779

22. Dispersion Relation Approach to the X-Ray Edge Problem
Topic: Condensed Matter Physics
Published: 12/15/1981
Authors: David R. Penn, S Girvin, G D Mahan
Abstract: We present a dispersion relation formulation of the open-line amplitude for the x-ray edge problem within the contact potential model. Using both multiple-scattering and determinant techniques, we find that to a very good approximation the many-body ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620211

23. Dynamical Screening at the Metal-semiconductor Interface and Excitonic Superconductivity
Topic: Condensed Matter Physics
Published: 3/27/1997
Authors: Oleg Zakharov, Marvin Cohen, Steven G Louie, David R. Penn
Abstract: We examine the possibility of excitonic superconductivity at a metal-semiconductor interface. An ab initio RPA calculation of the screened Coulomb electron-electron interaction is performed for the silicon-jellium multilayer model. The superconductin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620486

24. Effect of Bound Hole Pairs on the d-Band Photoemission Spectrum of Ni
Topic: Condensed Matter Physics
Published: 4/2/1979
Author: David R. Penn
Abstract: It is shown that the spectral density of the Ni d electrons contains a peak due to excitations of bound hole pairs. The spectral density is observed directly in photoemission experiments which show a satellite peak below the bottom of the d bands. Th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620171

25. Effect of Ground State and Excitation Potentials on Energy Levels of Ni Metal
Topic: Condensed Matter Physics
Published: 2/15/1976
Authors: R E Watson, J F Herbst, L Hodges, B I Lundqvist, J W Wilkins
Abstract: Self-consistent energy-band calculations for paramagnetic Ni have been performed in an effort to compare ground-state and excitationpotential prescriptions; potentials of the Hartree-Fock-Wigner-Seitz and Hedin-Lundqvist type are examined. We find t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620109

26. Effects of Broadening on the BCS Theory in the Presence of Van Hove Singularities
Topic: Condensed Matter Physics
Published: 1/1/1992
Authors: David R. Penn, Marvin Cohen
Abstract: There have been recent suggestions that high-Tc superconductivity can be understood in terms of conventional BCS theory if there is a logarithmic Van Hove singularity in the electron density of states near the Fermi energy as suggested by band theory ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620408

27. Effects of Edge Magnetism and External Electric Field on Energy Gaps in Multilayer Graphene Nanoribbons
Topic: Condensed Matter Physics
Published: 9/14/2010
Authors: Bhagawan Sahu, Hongki Min, Sanjay K Banerjee
Abstract: Using a first principles density functional theory, we study electronic structure of multilayer graphene nanoribbons as a function of the ribbon widths and an external electric fields. We consider two types of edges (armchair and zigzag) and each wit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905912

28. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904963

29. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903804

30. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905388



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