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Topic Area: Nanophysics

Displaying records 11 to 16.
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11. 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 ...

12. 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 ...

13. 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 ...

14. 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 ...

15. 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 ...

16. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Nanophysics
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 ...

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