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Physics

Condensed matter

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Displaying 801 - 825 of 1253

Quasiparticle Lifetime Broadening in Resonant X-ray Scattering of Ammonium Nitrate

July 28, 2016
Author(s)
John Vinson, Terrence J. Jach, Matthias Mueller, Rainer Unterumsberger, Burkhard Beckhoff
It has been previously shown that two effects cause dramatic changes in the x-ray absorption and emission spectrra from the N K edge of the insulating crystal ammonium nitate. First, vibrational disorder causes major changes in the absorption spectrum

Field-free switching of perpendicular magnetization through spin-orbit torque in antiferromagnet/ferromagnet/oxide structures

July 11, 2016
Author(s)
Young-Wan Oh, Young Min Kim, Hae Yeon Lee, Kyeong-Dong Lee, Chang-Geun Yang, Eun-Sang Park, Ki-Sueng Lee, Kyoung-Whan Kim, Hyun-Woo Lee, Kyung-Jin Lee, Byong-Guk Park
Spin-orbit torques (SOTs), spin-transfer torques caused by spin-orbit coupling, allow highly efficient manipulation of magnetization. To date, most experiments have utilized non-magnetic heavy metals as a source of SOT. Recent prediction of the anomalous

Direct time-domain observation of attosecond final-state lifetimes in photoemission from solids

July 1, 2016
Author(s)
Zhensheng Tao, Cong Chen, Tibor Szilvasi, Mark W. Keller, Manos Mavrikakis, Henry C. Kapteyn, Margaret M. Murnane
Attosecond spectroscopic techniques have made it possible to measure differences in transport times for photoelectrons from localized core levels and delocalized valence bands in solids. We report the application of attosecond pulse trains to directly and

Stability of Single Electron Devices: Charge Offset Drift

June 29, 2016
Author(s)
Michael D. Stewart, Neil M. Zimmerman
Abstract: Single electron devices (SEDs) afford the opportunity to isolate and manipulate individual electrons. This ability imbues SEDs with potential applications in a wide array of areas from metrology (current and capacitance) to quantum information

A Quantum Model of Thermodynamic Mechanical Oscillators

June 2, 2016
Author(s)
Jacob M. Taylor, Chiao-Hsuan Wang
We present a quantum mechanical model of a bath of spins coupled to the elasticity of a material. Motivated by understanding the emergence of thermodynamic restoring forces and oscillations, we show our model reproduces the behavior of a variety of

MPInterfaces: A Materials Project based Python Tool for a High Throughput Computational Screening of Interfacial Systems

May 31, 2016
Author(s)
Arunima Singh, Kiran Mathew, Joshua Grabriel, Kamal Choudhary, Susan B. Sinnott, Albert Davydov, Francesca M. Tavazza, Richard G. Hennig
A Materials Project based open-source python tool, MPInterfaces, has been developed to automate the high throughput computational screening and study of interfacial systems. The framework encompasses creation and manipulation of interface structures for

Depletion-Driven Crystallization of Cubic Colloids Sedimented on a Surface

May 19, 2016
Author(s)
Harold W. Hatch, William P. Krekelberg, Steven D Hudson, Vincent K. Shen
Cubic colloids, sedimented on a surface and immersed in a solution of depletant molecules, were modeled with a family of shapes which smoothly varies from squares to circles. Using Wang-Landau simulations with expanded ensembles, we observe the formation

Dynamic Onset of Feynman Relation in the Phonon Regime

May 9, 2016
Author(s)
Lu Deng, Edward W. Hagley, Yan Li, Chengjie Zhu
The Feynman relation 1, a much celebrated condensed matter physics gemstone for more than 70 years, predicts that the density excitation spectrum and structure factor of a condensed Bosonic system in the phonon regime drops linear and continuously to zero

Understanding and Control of Bipolar Doping in Copper Nitride

May 5, 2016
Author(s)
Angela N. Fioretti, Craig P. Schwartz, John Vinson, Dennis Nordlund, David Prendergast, Adele C. Tamboli, Filip Tuomisto, Stephan Lany, Eric S. Toberer, Andriy Zakutayev
Semiconductor materials that can be doped both n-type and p-type are desirable for diode-based applications and transistor technology. Copper nitride (Cu3N) is a metastable semiconductor with a solar-relevant bandgap that has been reported to exhibit

Spin-Orbit Coupled Bose-Einstein Condensates

April 15, 2016
Author(s)
Yu-Ju Lin, Karina K. Jimenez Garcia, Ian B. Spielman
Spin-orbit (SO) coupling -- the interaction between a quantum particle's spin and its momentum -- is ubiquitous in nature, from atoms to solids. In condensed matter systems, SO coupling is crucial for the spin-Hall effect and topological insulators; it

EUV-induced oxidation of carbon on TiO2

March 25, 2016
Author(s)
Nadir S. Faradzhev, Shannon B. Hill
Previously we reported on the etch rates of C on TiO2 by oxidizers including NO, O3 and H2O2 when irradiated by extreme ultraviolet (EUV) radiation at 13.5 nm [Faradzhev et al., J.Phys. Chem. C, 117 (2013) 23072-23081]. We demonstrated that the intensity

Reproducibility in density functional theory calculations of solids

March 25, 2016
Author(s)
Francesca Tavazza, Kurt Lejaeghere, Stefaan Cottenier, Gustav Bihlmayer
Density functional theory (DFT) is now routinely used for simulating material properties. Many software packages are available, which makes it challenging to know which are the best to use for a specific calculation. Lejaeghere et al. compared the

Hotspot Relaxation Dynamics in a Current Carrying Superconductor

March 17, 2016
Author(s)
Francesco Marsili, Martin Stevens, Alex Kozorezov, Varun Verma, Colin Lambert, Jeffrey A. Stern, Rob Horansky, Shellee D. Dyer, Shannon Duff, David P. Pappas, Matthew Shaw, Richard Mirin, Sae Woo Nam
When a photon is absorbed in a superconductor it creates a region of nonequilibrium superconductivity referred to as a hotspot [1]. The operation of most superconducting single photon detectors (microwave kinetic inductance detectors, MKIDs [2,3]

Universal Dynamic Magnetism in Yb Pyrochlores with Disparate Ground States

March 14, 2016
Author(s)
A. M. Hallas, J. Gaudet, Nicholas Butch, M. Tachibana, R. S. Freitas, G. M. Lake, C. R. Wiebe, B. D. Gaulin
The ytterbium pyrochlore magnets, Yb 2B 2O 7 (B=Sn, Ti, Ge) are well described by S eff = 1/2 quantum spins with local XY anisotropy, decorating the cubic pyrochlore lattice and interacting via anisotropic exchange. Structurally, while only the non

Field Effects of Current Crowding at Metal-MoS2 Contacts

March 10, 2016
Author(s)
Hui H. Yuan, Guangjun Cheng, Sheng Yu, Angela R. Hight Walker, Curt A. Richter, Qiliang Li
Gate assisted contact-end Kelvin test structures and gate assisted 4-probe structures have been designed and fabricated to measure the field effects of current crowding at the source/drain contacts of top-gate MoS2 field effect transistors. The transistors

The Structural Origin of Electron Injection Enhancements with Fulleropyrrolidine Interlayers

February 25, 2016
Author(s)
Lee J. Richter, Hyunbok Lee, Christopher McNeil, Eliot Gann, Lars Thomsen, S. Park, J. Jeong, Z. A. Page, Egle Puodziukynaite, Todd Emrick, Alejandro Briseno, John C. Stephenson, Dean M. DeLongchamp
Market demand for ubiquitous, increased functionality products at low cost (the internet of things) is spurring development in additive, solution processing of electronic devices. Performance in thin-film functional devices, be they transistors, diodes, or

Spintronics: Chiral damping

February 24, 2016
Author(s)
Kyoung-Whan Kim, Hyun-Woo Lee
Many objects in nature prefer to spiral in one particular direction to the other. A nanostructured magnetic system with strong spin-orbit coupling now shows that the energy loss is also chiral.

Morphological origins of polarization-induced scattering anisotropy from organic thin films

January 14, 2016
Author(s)
Eliot Gann, Brian A. Collins, Maolong Tang, John R. Tumbleston, Subhrangsu Mukherjee, Harald W. Ade
Anisotropic scattering patterns have been observed from organic thin films that are isotropic on the scale of the probe in polarized resonant X-ray scattering experiments. The symmetry is broken by local correlations between molecular orientation and

Edge-state Transport in Graphene p-n Junctions in the Quantum Hall Regime

December 7, 2015
Author(s)
Nikolai Klimov, Son T. Le, Jun Yan, Pratik Agnihotri, Everett Comfort, Ji Ung Lee, David B. Newell, Curt A. Richter
We experimentally investigate charge carrier transport in a graphene p-n junction device by using independent p-type and n-type electrostatic gating which allow full characterization of the junction interface in the quantum Hall regime covering a wide
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