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Topic Area: Electron Physics

Displaying records 1 to 10 of 94 records.
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1. Absolute pulse energy measurements of soft x-rays at the Linac Coherent Light Source
Topic: Electron Physics
Published: 8/25/2014
Authors: Uwe Arp, Alexander Sorokin, Ulf Jastrow, Pavle Jurani?, Svea Kreis, Mathias Richter, Yiping Feng, Dennis Nordlund, Kai Tiedtke, Philip Heimann, Bob Nagler, Hae Ja Lee, Stephanie Mack, Marco Cammarata, Oleg Krupin, Marc Messerschmidt, Michael Holmes , Michael Rowen, William Schlotter, Stefan Moeller, Joshua Turner
Abstract: This paper reports novel measurements of x-ray optical radiation on an absolute scale from a recently developed source of radiation generated in the soft x-ray regime of a free electron laser. We give a brief description of the physics behind the ...

2. Interface scattering in polycrystalline thermoelectrics
Topic: Electron Physics
Published: 3/24/2014
Authors: Adrian Popescu, Paul M Haney
Abstract: We study the effect of electron and phonon interface scattering on the thermoelectric properties of disordered, polycrystalline materials (with grain sizes larger than electron and phonons' mean free path). Interface scattering of electrons is treat ...

3. Current induced torques between ferromagnets and compensated antiferromagnets: symmetry and phase coherence effects.
Topic: Electron Physics
Published: 2/19/2014
Authors: Paul M Haney, Karthik Prakhya, Adrian Popescu
Abstract: It is shown that the current-induced torques between a ferromagnetic layer and an antiferromagnetic layer with a compensated interface vanish when the ferromagnet is aligned with an axis of spin-rotation symmetry of the antiferromagnet. For properl ...

4. Current-induced torques and interfacial spin-orbit coupling
Topic: Electron Physics
Published: 12/19/2013
Authors: Kyung-Jin Lee, H.-W. Lee, Aurelien Manchon, Mark D Stiles, Paul M Haney
Abstract: In bilayer systems consisting of an ultrathin ferromagnetic layer adjacent to a metal with strong spin-orbit coupling, an applied in-plane current induces torques on the magnetization. The torques that arise from spin-orbit coupling are of particul ...

5. Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multi-layer epitaxial graphene
Topic: Electron Physics
Published: 8/1/2013
Authors: Randolph E Elmquist, Fan-Hung Liu, Chang-Shun Hsu, Chiashain Chuang, Tak-Pong Woo, Lung-I Huang Huang, Chi-Te Laing, Yasuhiro Fukuyama, Yanfei Yang
Abstract: We have performed magnetotransport measurements on multi-layer epitaxial graphene. By increasing the driving current I through our graphene devices while keeping the bath temperature fixed, we are able to study Dirac fermion heating and current scali ...

6. Two-dimensional transport and screening in topological insulator surface states
Topic: Electron Physics
Published: 6/6/2012
Authors: Shaffique Adam, Euyheon Hwang, Sankar Das Sarma
Abstract: We study the surface states of Bi2Se3 close to the topologically protected crossing point. Close to charge neutrality, local fluctuations in carrier density result in electron and hole puddles that dominate the electronic properties of these materi ...

7. Characteristics of Graphene for Quantized Hall Effect Measurements
Topic: Electron Physics
Published: 6/1/2012
Authors: Randolph E Elmquist, Mariano A. Real, Irene G. Calizo, Brian G Bush, Tian T. Shen, Nikolai Nikolayevich Klimov, David B Newell, Angela R Hight Walker, Randall M. Feenstra
Abstract: This paper describes concepts and measurement techniques necessary for characterization of graphene in the development of graphene-based quantized Hall effect (QHE) devices and resistance standards. We briefly contrast the properties of graphene prod ...

8. Electronic properties of multilayer graphene
Topic: Electron Physics
Published: 3/31/2012
Author: Hongki Min
Abstract: In this chapter, we study the electronic structure of arbitrarily stacked multilayer graphene in the absence or presence of magnetic field. Energy band structure and Landau level spectrum are obtained using a pi-orbital continuum model with nearest-n ...

9. Formation and structure of 360 and 540 degree domain walls in thin magnetic stripes
Topic: Electron Physics
Published: 2/10/2012
Authors: Youngman Jang, Samuel R Bowden, Mark Mascaro, John Unguris, Caroline Ross
Abstract: 360˚, 540˚ and other complex transverse domain walls have been created in narrow Co wires connected to injection pads by cycling a magnetic field perpendicular to the wire length. The composite walls, formed by impingement of 180˚ tran ...

10. Graphene: Plane and Simple Electrical Metrology?
Topic: Electron Physics
Published: 12/7/2011
Authors: Randolph E Elmquist, Felipe Hernandez-Marquez, Mariano Real, Tian T. Shen, David B Newell, Colin James Jacob, George R Jones
Abstract: The development of large-area graphene has direct application to electrical standards including the quantized Hall resistance because of unique characteristics not found in conventional devices. These include symmetrical conduction by electrons and h ...

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