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Physics

Condensed matter

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Displaying 401 - 425 of 2291

A Large Beam High Efficiency Radio Frequency Neutron Spin Flipper

June 21, 2021
Author(s)
Wangchun Chen, Ross W. Erwin, Peter Tsai, Md. T. Hassan, Nancy Hadad, Charles F. Majkrzak
A design for a radio-frequency (RF) neutron spin flipper obtained from magneto-static and neutron spin transport simulations is presented. The RF flipper constructed from this design provides a flipping probability of 0.999 or better for a beam size 6 cm

High-Energy Magnetic Excitations from Heavy Quasiparticles in CeCu 2 Si 2

June 18, 2021
Author(s)
Yu Song, Weiyi Wang, Chongde Cao, Zahra Yamani, Yuanji Xu, Yutao Sheng, Wolfgang Loser, Yiming Qiu, Yi-Feng Yang, Robert J. Birgeneau, Pengcheng Dai
The heavy fermion superconductor CeCu 2Si 2 is located near an antiferromagnetic quantum critical point, indicating significant interplay between magnetism and superconductivity. Using inelastic neutron scattering, we show magnetic excitations in CeCu 2Si

Origin and control of ionic hydration patterns in nanopores

June 18, 2021
Author(s)
Miraslau L. Barabash, William A. Gibby, Carlo Guardiani, Alexander Smolyanitsky, Dmitry G. Luchinsky, Peter V. McClintock
In order to permeate a nanopore, an ion must overcome a dehydration energy barrier caused by the redistribution of surrounding water molecules. The redistribution is inhomogeneous, anisotropic and strongly position-dependent, resulting in complex patterns

Monopolar and dipolar relaxation in spin ice Ho2Ti2O7

June 16, 2021
Author(s)
Yishu Wang, T. Reeder, Y. Karaki, J. Kindervater, T. Halloran, Nicholas C. Maliszewskyj, Yiming Qiu, Jose Rodriguez Rivera, Sergiy Gladchenko, S. M. Koohpayeh, S. Nakatsuji, Collin L. Broholm
Ferromagnetically interacting Ising spins on the pyrochlore lattice of corner-sharing tetrahedra form a highly degenerate manifold of low-energy states. A spin flip relative to this "spin-ice" manifold can fractionalize into two oppositely charged magnetic

Database of Ab Initio L-edge X-ray Absorption Near Edge Structure

June 11, 2021
Author(s)
Yiming Chen, Chi Chen, Chen Zheng, Shyam Dwaraknath, Matthew K. Horton, Jordi Cabana, John J. Rehr, John Vinson, Alan K. Dozier, Kristin A. Persson, Shyue P. Ong
The L-edge X-ray Absorption Near Edge Structure (XANES) is widely used in the characterization of transition metal compounds. Here, we report the development of a database of computed L-edge XANES using the multiple scattering theory-based FEFF9 code. The

Field-induced dehydration and optimal ionic escape paths for C2N membranes

June 11, 2021
Author(s)
Miroslav Barabash, William Gibby, Dmitry Luchinsky, Binquan Luan, Alexander Smolyanitsky, Peter McClintock
Most analytic theories describing electrostatically driven ion transport through water-filled nanopores assume that the corresponding permeation barriers are bias-independent. While this assumption may hold for sufficiently wide pores under infinitely

Mobility Extraction in 2D Transition Metal Dichalcogenide Devices - Avoiding Contact Resistance Implicated Overestimation

June 10, 2021
Author(s)
Chin-Sheng Pang, Ruiping Zhou, Xiangkai Liu, Peng Wu, Terry Y. Hung, Shiqi Guo, Mona E. Zaghloul, Sergiy Krylyuk, Albert Davydov, Joerg Appenzeller, Zhihong Chen
Schottky barrier (SB) transistors operate distinctly different from conventional metal-oxide semiconductor field-effect transistors (MOSFETs), in a unique way that the gate impacts the carrier injection from the metal source/drain contacts into the channel

Resonant Spin Transmission Mediated by Magnons in a Magnetic Insulator Multilayer Structure

June 3, 2021
Author(s)
Yabin Fan, Joseph Finley, Jiahao Han, Megan E. Holtz, Patrick Quarterman, Pengxiang Zhang, Taqiyyah S. Safi, Justin T. Hou, Alexander Grutter, Luqiao Liu
One important goal of magnonics is to discover novel wave properties of magnons, which are quanta of collective excitation in magnets, to make it compatible for application on coherent information transmission and processing1,2. However, thin-film

Observation of chiral photocurrent transport in the quantum Hall regime in graphene

May 24, 2021
Author(s)
Glenn S. Solomon, Olivier Gazzano, Bin Cao, Jiuning Hu, David B. Newell, Tobias Huber, Michael Gullans, Mohammad Hafezi, Tobias Grass
Optical excitation provides a powerful tool to investigate non-equilibrium physics in quantum Hall systems. Moreover, the length scale associated with photo-excited charge carries lies between that of local probes and global transport measurements. Here

Pristine Quantum Criticality in a Kondo Semimetal

May 19, 2021
Author(s)
Wesley T. Fuhrman, Andrey Sidorenko, Jonathan Hanel, Hannes Winkler, Andrey Prokofiev, Jose Rodriguez Rivera, Yiming Qiu, Peter Blaha, Qimiao Si, Collin L. Broholm, Silke Paschen
The observation of quantum criticality in diverse classes of strongly correlated electron systems has been instrumental in establishing ordering principles, discovering new phases, and identifying the relevant degrees of freedom and interactions. At focus

Magnetic Ordering in the Ising Antiferromagnetic Pyrochlore Nd 2 ScNbO 7

May 14, 2021
Author(s)
C. Mauws, N. Hiebert, M. Rutherford, H. D. Zhou, Q. Huang, M. B. Stone, Nicholas Butch, Y. Su, E. S. Choi, Z. Yamani, C. R. Wiebe
The question of structural disorder and its effects on magnetism is relevant to a number of spin liquid candidate materials. Although commonly thought of as a route to spin glass behavior, here we describe a system in which the structural disorder destroys
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