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Topic Area: Nanophysics
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Displaying records 11 to 20 of 21 records.
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11. Electromagnetic Energy Density in Dispersive and Dissipative Media
Topic: Nanophysics
Published: 6/1/2011
Authors: Frederico D. Nunes, Thiago Vasconcelos, Marcel Bezerra, John Weiner
Abstract: The description of the energy density associated with an electromagnetic field propagating through matter must treat two different phenomena: dispersion, the variation of the refractive index with frequency, and dissipation, the loss of field energy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906602

12. Landau Levels and Band Bending in Few-Layer Epitaxial Graphene
Topic: Nanophysics
Published: 4/18/2011
Authors: Hongki Min, Shaffique Adam, Young J. Song, Joseph A Stroscio, Mark D Stiles, Allan H. MacDonald
Abstract: The carrier density distributions in few-layer-graphene systems grown on the carbon face of silicon carbide can be radically altered by the presence of a Scanning Tunneling Microscope (STM) tip used to probe top-layer electronic properties, and by ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907652

13. Effects of Edge Magnetism and External Electric Field on Energy Gaps in Multilayer Graphene Nanoribbons
Topic: Nanophysics
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

14. Temperature dependence of the diffusive conductivity of bilayer graphene
Topic: Nanophysics
Published: 8/24/2010
Authors: Shaffique Adam, Mark D Stiles
Abstract: Assuming diffusive carrier transport and employing an effective medium theory, we calculate the temperature dependence of bilayer graphene conductivity due to Fermi-surface broadening as a function of carrier density. We find that the temperature d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904658

15. Real Space Mapping of Magnetically Quantized Graphene States
Topic: Nanophysics
Published: 8/8/2010
Authors: Joseph A Stroscio, D. L. Miller, Kevin Kubista, Gregory M. Rutter, Ming Ruan, Walt A. de Heer, Markus Kindermann, Phillip N. First
Abstract: In a perpendicular magnetic field, the quantized independent-electron states (Landau levels) of graphene are degenerate in the valley degree of freedom and nearly-so in spin. The momentum-space valley degeneracy traces to the equivalence of the A a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904831

16. Band Structure of ABC-Stacked Graphene Trilayers
Topic: Nanophysics
Published: 7/9/2010
Authors: Fan Zhang, Bhagawan Sahu, Hongki Min, Allan H. MacDonald
Abstract: The ABC-stacked N-layer-graphene family of two-dimensional electron systems is described at low energies by two remarkably flat bands with Bloch states that have strongly momentum-dependent phase differences between carbon \pi-orbital amplitudes on ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905348

17. Effects of disorder and internal dynamics on vortex wall propagation
Topic: Nanophysics
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

18. Hybrid gap modes induced by fiber taper waveguides: application in spectroscopy of single solid-state emitters deposited on thin films.
Topic: Nanophysics
Published: 5/24/2010
Authors: Marcelo Ishihara Davanco, Kartik A Srinivasan
Abstract: We show, via simulations, that an optical fiber taper waveguide may be an efficient spectroscopy tool for single emitters, such as single molecules or colloidal quantum dots, deposited on the surface of a thin dielectric membrane. The fiber-membra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904726

19. Effects of magnetism and electric field on the energy gap of bilayer graphene nanoflakes
Topic: Nanophysics
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

20. Making Mn Substitutional Impurities in InAs using a Scanning Tunneling Microscope
Topic: Nanophysics
Published: 9/29/2009
Authors: Young J. Song, Steven C. Erwin, Gregory M. Rutter, Phillip N. First, Nikolai B Zhitenev, Joseph A Stroscio
Abstract: We describe in detail a new atom-by-atom exchange manipulation technique using a scanning tunneling microscope probe. As-deposited Mn adatoms (Mnad) are exchanged one-by-one with surface In atoms (Insu) to create a Mn surface-substitutional (MnIn) a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903324



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