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Physics

Condensed matter

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Displaying 526 - 550 of 1261

Single-scan acquisition of multiple multidimensional spectra

May 29, 2019
Author(s)
Travis M. Autry, Galan Moody, James M. Fraser, Corey A. McDonald, Richard P. Mirin, Kevin L. Silverman
Multidimensional coherent spectroscopy is a powerful tool for understanding the ultrafast dynamics of complex quantum systems. To fully characterize the nonlinear optical response of a system, multiple pulse sequences must be recorded and quantitatively

Magnetic Structure and Spin Waves in the Frustrated Ferro-Antiferro Magnet Pb 2 VO(PO 4 ) 2

May 28, 2019
Author(s)
S. Bettler, F. Landolt, O. M. Aksoy, Z. Yan, S. Gvasaliya, Yiming Qiu, E. Ressouche, K. Beauvois, S. Raymond, A. N. Ponomaryov, S. A. Zvyagin, A. Zheludev
Single crystal neutron diffraction, inelastic neutron scattering and electron spin resonance experiments are used to study the magnetic structure and spin waves in Pb 2VO(PO 4) 2, a prototypical layered S =1/2 ferromagnet with frustrating next nearest

Long-term drift of Si-MOS quantum dots with intentional donor implants

May 21, 2019
Author(s)
m rudolph, B Sarabi, Roy E. Murray, M Carroll, Neil M. Zimmerman
Charge noise can be detrimental to the operation of quantum dot (QD) based semiconductor qubits. We study the low-frequency charge noise by charge o set drift measurements for Si-MOS devices with intentionally implanted donors near the QDs. We show that

Mechanisms of spontaneous chain formation and subsequent microstructural evolution in shear- driven strongly confined drop monolayers

May 18, 2019
Author(s)
Sagnik Singha, Abhilash R. Malipeddi, Mauricio Zurita-Gotor, Kausik Sarkar, Kevin Shen, Michael Loewenberg, Kalman D. Migler, Jerzy Blawzdziewicz
It was experimentally demonstrated by Migler and his collaborators [Phys. Rev. Lett. 2001, 86, 1023; Langmuir 2003, 19, 8667] that a strongly confined drop monolayer sheared between two parallel plates can spontaneously develop a flow-oriented drop-chain

Co 25 Fe 75 Thin Films with Ultralow Total Damping

May 13, 2019
Author(s)
Eric R. Edwards, Hans T. Nembach, Justin M. Shaw
We measure the dynamic properties of Co 25Fe 75 thin films grown by dc magnetron sputtering. Using ferromagnetic resonance spectroscopy, we demonstrate an ultralow total damping parameter in the out-of-plane configuration of 0.0013, whereas for the in

Designing new structures in epitaxial graphene on SiC: transport and quantum effects

May 13, 2019
Author(s)
Randolph Elmquist, Hanbyul Jin, Mattias Kruskopf, Martina Marzano, Dinesh K. Patel, Alireza Panna, Albert Rigosi
When epitaxial graphene (EG) grows on hexagonal SiC(0001), chemical doping is produced by bonds at the epitaxial interface, or buffer layer. Robust quantum Hall effect (QHE) plateaus are observed at RK/2 = h/2e2, where RK is a constant of electrical

Quantum Critical Behavior in Ce(Fe 0.76 Ru 0.24 ) 2 Ge 2

May 7, 2019
Author(s)
Wouter Montfrooij, Tom Heitmann, Yiming Qiu, Shannon M. Watson, Ross Erwin, Wangchun Chen, Yang Zhao, Meigan Aronson, Yingkai Huang, Anne de Visser
Systems with embedded magnetic ions that exhibit a competition between magnetic order and disorder down to absolute zero can display unusual low temperature behaviors of the resistivity, hyperscaling behavior in which the relaxation back to equilibrium

Quantum Spin Ice Dynamics in the Dipole-Octupole Pyrochlore Magnet Ce 2 Zr 2 O 7

May 7, 2019
Author(s)
Jonathan Gaudet, E. M. Smith, J. Dudemaine, J. Beare, C.R.C. Buhariwalla, Nicholas Butch, M. B. Stone, A. I. Kolesniko, Guangyong Xu, D. R. Yahne, K. A. Ross, C. A. Marjerrison, J. D. Garrett, G. M. Luke, A. D. Bianchi, B. D. Gaulin
Neutron scattering measurements on the pyrochlore magnet Ce 2Zr 2O 7 reveal an unusual crystal field splitting of its lowest J=5/2 multiplet, such that its ground state doublet is composed of m j= ± 3/2, giving these doublets a dipole - octupole (DO)

Induced quantum dot probe for materials characterization

April 19, 2019
Author(s)
Hilary M. Hurst, Yun-Pil Shim, Rusko Ruskov, Charles Tahan
We propose a non-destructive means of characterizing a semiconductor wafer via measuring parameters of an induced quantum dot on the material system of interest with a separate probe chip that can also house the measurement circuitry. We show that a single

Spin-current-mediated Rapid Magnon Localisation and Coalescence After Ultrafast Optical Pumping of Ferrimagnetic Alloys

April 15, 2019
Author(s)
Ezio E. Iacocca, TianMin Liu, Alexander H. Reid, Z Fu, S Ruta, P. W. Granitzka, E Jal, S. Bonetti, A. Gray, C E. Graves, R Kukreja, Z Chen, Daniel Higley, T Chase, L L. Guyader, K Hirsch, H Ohldag, W F. Schlotter, G L. Dakovski, Giacomo Coslovich, M C. Hoffmann, S Carron, A Tsukamoto, A Kirilyuk, A V. Kimel, Th Rasing, J Stohr, R F. Evans, T Ostler, R W. Chantrell, M A. Hoefer, Thomas J. Silva, H A. Durr
Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty

Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces

April 14, 2019
Author(s)
Dustin A. Hite, Hossein Jooya, X Fan, Kyle S. McKay, David P. Pappas, H.R. Sadeghpour
We show in this work that the work function change due to carbon adatom adsorption is not predominantly affected by the crystallographic orientation of the gold surface. Ab-initio calculations within density-functional theory are performed on carbon

Low-resistance, high-yield electrical contacts to atom scale Si:P devices using palladium silicide

March 29, 2019
Author(s)
Scott W. Schmucker, Pradeep Namboodiri, Ranjit Kashid, Xiqiao Wang, Binhui Hu, Jonathan Wyrick, Alline Myers, Joshua D. Schumacher, Richard M. Silver, Michael Stewart
Scanning tunneling microscopy (STM) enables the fabrication of 2-D delta-doped structures in Si with atomistic precision, with applications from tunnel field effect transistors to qubits. The combination of a very small contact area and the restrictive

Nanoscale Ferroelastic Twins Formed in Strained LaCoO 3 Films

March 29, 2019
Author(s)
Er-Jia Guo, Ryan Desautels, David Keavney, Manuel A. Roldan, Brian Kirby, Dongkyu Lee, Zhaoliang Liao, Timothy Charlton, Andreas Herklotz, T. Zac Ward, Michael R. Fitzsimmons, Ho Nyung Lee
The formation of twinning domains has been established as a major mechanism to accommodate epitaxial strain in rhombohedral ferroelastic oxide thin films. The elastic energy can be released at the expense of high interfacial energy at the domain boundaries

Probing the Participation of Oxygen Redox in the Electrochemical Cycling of Li-Rich Li2IrO3

March 25, 2019
Author(s)
Eric L. Shirley, John T. Vinson, Liang Li, Maria K. Chan, Joong S. Park, Eungje Lee, John W. Freeland, Zhenpeng Yao, Fernando Castro, Timothy T. Fister, Christopher M. Wolverton, Michael Thackeray
To exploit extra capacity beyond the traditionally postulated transition metal redox in Li-ion batteries, it is imperative to understand the exact role of oxygen in the charge compensation, i.e., what triggers the electron occupation change in oxygen and

Comment on "Giant Electromechanical Coupling of Relaxor Ferroelectrics Controlled by Polar Nanoregion Vibrations"

March 22, 2019
Author(s)
Peter M. Gehring, Zhijun NMN Xu, C. Stock, Guangyong NMN Xu, Daniel E Parshall, Leland Weldon Harriger, C. A. Gehring, Xiaobing Li, Haosu Luo
Manley et al. (Science Advances, 16 September 2016, p.e1501814) report a splitting of a transverse acoustic phonon branch below T c in the relaxor ferroelectric Pb[(Mg 1/3Nb 2/3) 1-xTi x]O 3 with x=0.30 using neutron scattering methods. They argue that

Correlating anisotropic mobility and intermolecular phonons in organic semiconductors to investigate transient localization

March 19, 2019
Author(s)
Emily G. Bittle, Adam J. Biacchi, Lisa A. Fredin, Andrew A. Herzing, Thomas C. Allison, Angela R. Hight Walker, David J. Gundlach
Charge transport in organic semiconductors is governed by a mix of polaron hopping and band- like transport mechanisms. The energy of polaron hopping and formation are similar in magnitude to the energies of inter- and intra- molecular modes, which points

Correlated Spin Canting in Ordered Core-Shell Fe 3 O 4 /Mn x Fe 3-x Od4^ Nanoparticle Assemblies

March 18, 2019
Author(s)
Y. Ijiri, Kathryn L. Krycka, I. Hunt-Isaak, H. Pan, J. Hsieh, Julie Borchers, James Jennings Rhyne, Samuel D. Oberdick, A. Abdelgawad, S. A. Majetich
Polarization-analyzed small-angle neutron scattering methods are used to determine the spin arrangements in ordered three-dimensional assemblies of 7.4 nm diameter core-shell Fe 3O 4/Mn xFe 3-xO 4 nanoparticles. In moderate to high magnetic fields, the

Spinon Confinement and a Sharp Longitudinal Mode in Yb 2 Pt 2 Pb in Magnetic Fields

March 8, 2019
Author(s)
W. J. Gannon, I. A. Zaliznyak, L. S. Wu, A. E. Feiguin, A. M. Tsvelik, F. Demmel, Yiming Qiu, John R. Copley, M. S. Kim, M. C. Aronson
The fundamental excitation of spin chain systems is the spinon, which is a deconfined quasiparticle with fractionalized spin. Coupling spin chains leads to the confinement of these spinons, a condensed matter analog of quark confinement in quantum

Exploring Interfacial Exchange Coupling and Sublattice Effect in Heavy Metal/Ferrimagnetic Insulator Heterostructures using Hall Measurements, X-Ray Magnetic Circular Dichroism, and Neutron Reflectometry

March 4, 2019
Author(s)
Qiming Shao, Alexander Grutter, Yawen Liu, Guoqiang Yu, Chao-Yao Yang, Dustin A. Gilbert, Elke Arenholz, Padraic Shafer, Xiaoyu Chi, Chi Tang, Mohammed Aldosary, Aryan Navabi, Qing Lin He, Brian Kirby, Jing Shi, Kang L. Wang
Ferrimagnetic insulators (FMIs), such as rare-earth iron garnets, are of considerable interest for low-power spintronics due to low Gilbert damping and the absence of free charge carriers. FMIs are also promising candidate materials for high-frequency
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