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Topic Area: Electron Physics

Displaying records 21 to 30 of 94 records.
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21. Current induced torques in the presence of spin-orbit coupling
Topic: Electron Physics
Published: 9/17/2010
Authors: Paul M Haney, Mark D Stiles
Abstract: In systems with strong spin-orbit coupling, the relationship between spin-transfer torque and the divergence of the spin current is generalized to a relation between spin transfer torques, total angular momentum current, and mechanical torques. I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906100

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

23. Band Structure of ABC-Stacked Graphene Trilayers
Topic: Electron Physics
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

24. Frequency-Dependent Charge-Pumping: The Depth Question Revisited
Topic: Electron Physics
Published: 5/1/2010
Authors: Fan Zhang, Kin P Cheung, Jason P Campbell, John S Suehle
Abstract: A popular defect depth-profiling technique, frequency-dependent charge-pumping is carefully re-examined. Without complicated math of modeling, the physics behind the technique is examined clearly. It is shown that there is no unique relationship betw ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904997

25. Viewpoint on "Symmetry breaking in the zero-energy Landau level in bilayer graphene"
Topic: Electron Physics
Published: 2/8/2010
Author: Shaffique Adam
Abstract:
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904893

26. Spin-transfer dynamics in spin valves with out-of-plane magnetized CoNi free layers
Topic: Electron 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903981

27. Magnetic dynamics with spin transfer torques near the Curie temperature.
Topic: Electron Physics
Published: 9/24/2009
Authors: Paul M Haney, Mark D Stiles
Abstract: In this paper we explore the combined action of large thermal fluctuations and spin transfer torques on the behavior of magnetic layers in spin valves. We find that at temperatures near Tc, spin currents can measurably change the size of the magnet ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902578

28. Measurement of Small Birefringence and Loss in a Nonlinear Single-mode Waveguide
Topic: Electron Physics
Published: 5/11/2009
Authors: Daniel Rogers, Charles W Clark, Christopher Richardson, Julius Goldhar
Abstract: We design and fabricate a birefringent semiconductor waveguide for application to nonlinear photonics, demonstrating that it is possible to engineer a small birefringence into such a device using multiple core layers. We also demonstrate a simple t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901507

29. A Bose-Einstein Condensate in a Uniform Light-Induced Vector Potential
Topic: Electron Physics
Published: 3/30/2009
Authors: Yu-Ju Lin, Robert L. Compton, Abigail Reiko Perry, William D Phillips, James V Porto, Ian B Spielman
Abstract: We use a two-photon dressing field to create an effective vector gauge potential for Bose-condensed ^87Rb atoms in the F=1 hyperfine ground state. The dressed states in this Raman field are spin and momentum superpositions, and we adiabatically load ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900224

30. Alignment of Fiducial Marks in a Tomographic Tilt Series with an Unknown Rotation Axis
Topic: Electron Physics
Published: 4/1/2007
Authors: Zachary H Levine, Peter Volkovitsky, Howard Hung
Abstract: Alignment for tomography using a transmission electron microscopy frequently uses colloidal gold particles as fiducial reference marks. Typically, there is an implicit assumption that the tilt axis of the tomographic series is orthogonal to the beam ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906668



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