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Physics

Condensed matter

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Displaying 451 - 475 of 1253

Magnon Profile on SrRuO 3 Films Studied by Inelastic Neutron Scattering

February 3, 2020
Author(s)
G. D. Dwivedi, C.-M. Wu, Bo-Yu Chen, S. T. Lin, W.-Z. Qiu, S. J. Sun, Guangyong Xu, Jeffrey W. Lynn, J. W. Chiou, C.-H. Lee, W.-H. Li, S. Yano, H. Chou
In this study, the inelastic neutron scattering (INS) probe of SIKA in ANSTO is employed to investigate the magnon dispersion curve in ferromagnetic SrRuO 3 single crystal epitaxial films and to better understand the underlying mechanisms. This report

A Predictive Control Algorithm for Time-Division-Multiplexed Readout of TES Microcalorimeters

January 28, 2020
Author(s)
Malcolm S. Durkin, Galen C. O'Neil, William B. Doriese, Johnathon D. Gard, Gene C. Hilton, Jozsef Imrek, Nathan J. Ortiz, Carl D. Reintsema, Robert W. Stevens, Daniel S. Swetz, Joel N. Ullom
Time division multiplexing (TDM) uses a digital flux-locked loop (DFLL) to linearize each first-stage SQUID amplifier. Presently, the dynamic range of our TDM systems is limited by the use of a proportional-integral controller to maintain the DFLL. In this

Optimal in situ electromechanical sensing of molecular species

January 21, 2020
Author(s)
Maicol A. Ochoa, Michael P. Zwolak
We investigate protocols for optimal molecular detection with electromechanical nanoscale sensors in ambient conditions. Our models are representative of suspended graphene nanoribbons, which due to their piezoelectric and electronic properties, provide

All-optical spin transfer between elemental sublattices in half-metallic Co2MnGe Heusler compound within the femtosecond laser excitation pulse

January 17, 2020
Author(s)
Phoebe Tengdin, Christian Gentry, Adam Blonsky, Dmitriy Zusin, Michael Gerrity, Lukas Hellbruck, Moritz Hofherr, Justin Shaw, Yaroslav Kvashnin, Erna K. Delczeg-Czirjak, Monika Arora, Hans Nembach, Thomas J. Silva, Stefan Mathias, Martin Aeschliman, Henry C. Kapteyn, Danny Thonig, Konstantinos Koumpouras, Olle Eriksson, Margaret M. Murnane
Heusler compounds are exciting materials for future spintronics applications because they display a wide range of tunable electronic and magnetic interactions. Here, we use a femtosecond laser to directly transfer spin polarization from one element to

Ultrafast optically induced spin transfer in ferromagnetic alloys

January 17, 2020
Author(s)
Moritz Hofherr, Soren Hauser, J. K. Dewhurst, Phoebe Tengdin, S Sakshath, Hans Nembach, Tobias Weber, Justin Shaw, Thomas J. Silva, H C. Kapteyn, M Cinchetti, B Rethfeld, M M. Murnane, D Steil, B Stadtmuller, S Sharma, Martin Aeschlimann, S Mathias
The vision of using light to manipulate electronic and spin excitations in materials on their fundamental time and length scales requires new approaches in experiment and theory to observe and understand these excitations. The ultimate speed limit for all

Valley Phenomena in the Candidate Phase Change Material WSe2(1-x)Te2x

January 15, 2020
Author(s)
Sean M. Oliver, Joshua Young, Sergiy Krylyuk, Thomas L. Reinecke, Albert Davydov, Patrick M. Vora
Alloyed transition metals dichalcogenides (TMDs) provide the unique opportunity for coupling band engineering and valleytronic phenomena in an atomically-thin platform. However, valley properties remain largely unexplored in TMD alloys. Here, we

Demonstration of 220/280 GHz Multichroic Feedhorn-Coupled TES Polarimeter

January 3, 2020
Author(s)
Samantha L. Walker, Carlos E. Sierra, Jason E. Austermann, James A. Beall, Daniel T. Becker, Bradley J. Dober, Shannon M. Duff, Gene C. Hilton, Johannes Hubmayr, Jeffrey L. Van Lanen, Jeff McMahon, Sara M. Simon, Joel N. Ullom, Michael R. Vissers
We describe the design and measurement of feedhorn-coupled, transition-edge sensor (TES) polarimeters with two passbands centered at 220 GHz and 280 GHz, intended for observations of the cosmic microwave background. Each pixel couples polarized light in

A self-assembled graphene ribbon grown on SiC

January 2, 2020
Author(s)
Bi Y. Wu, Yanfei Yang, Albert Rigosi, Jiuning Hu, Hsin Y. Lee, Guangjun Cheng, Vishal Panchal, Mattias Kruskopf, Hanbyul Jin, Kenji Watanabe, Takashi Taniguchi, David B. Newell, Randolph Elmquist, Chi-Te Liang

Decoupled Molecular and Inorganic Framework Dynamics in CH 3 NH 3 PbCl 3

December 30, 2019
Author(s)
M. Songvilay, Zitian Wang, Victoria Garcia Sakai, T. Guidi, M. Bari, Zuo-Guang Ye, Guangyong Xu, K. L. Brown, Peter M. Gehring, Christopher Stock
The organic-inorganic lead halide perovskites are composed of organic molecules embedded in an inorganic framework. The compounds with general formula CH 3NH 3PbX 3 (MAPbX 2) display large photovoltaic efficiencies for halogens X=Cl, Br, and I in a wide

Use of quantum effects as potential qualifying metrics for "quantum grade silicon"

December 30, 2019
Author(s)
Aruna N. Ramanayaka, Ke Tang, Joseph A. Hagmann, Hyun S. Kim, David S. Simons, Curt A. Richter, Joshua M. Pomeroy
Across solid state quantum information, material deficiencies limit performance through enhanced relaxation, charge defect motion, or isotopic spin noise. While classical measurements of device performance provide cursory guidance, specific qualifying

Absence of Magnetic Ordering in the Spin Liquid Candidate Ca 3 Cu 2 GeV 2 O 12

December 27, 2019
Author(s)
Joey A. Lussier, Brooke N. Richtik, Cole Mauws, Jeffrey W. Lynn, Chris R. Wiebe
Typically, quantum spin liquid candidates can be found in materials with a combination of geometrical frustration along with low spin. Due to its spin of S=1/2 the copper (II) ion is often present in the discussion on spin liquid candidates. The solid

Point-Node Gap Structure of Spin-Triplet Superconductor UTe 2

December 19, 2019
Author(s)
Tristin Metz, Seokjin Bae, Sheng NMN Ran, I-Lin Liu, Yun Suk Eo, Wesley T. Fuhrman, Daniel F. Agterberg, Steven M. Anlage, Nicholas Butch, Johnpierre Paglione
Low-temperature electrical and thermal transport, heat capacity and magnetic penetration depth measurements were performed on single crystals of the actinide superconductor UTe 2 to determine the structure of the superconducting energy gap. Millikelvin

Dielectric properties of Nb_x}W_1-x}Se_2} alloys

December 16, 2019
Author(s)
Albert Rigosi, Heather M. Hill, Sergiy Krylyuk, Nhan V. Nguyen, Angela Hight Walker, Albert Davydov, David Newell
The growth of transition metal dichalcogenide (TMDC) alloys provides an opportunity to experimentally access information elucidating how optical properties change with gradual substitutions in the lattice compared with their pure compositions. In this work

A Strategy for Handling Aberration in Spherical Neutron Polarimetry

December 11, 2019
Author(s)
Jacob Tosado, Wangchun Chen, Efrain E. Rodriguez
We present a strategy for identifying and correcting for aberration effects in Spherical Neutron Polarimetry. The transformation of the neutron beam polarization vector due to scattering from a material is determined with Spherical Neutron Polarimetry

Extreme Magnetic Field-Boosted Superconductivity

December 1, 2019
Author(s)
Sheng NMN Ran, I Lin NMN Liu, Yun Suk Eo, Daniel J. Campbell, Paul M. Neves, Wesley T. Fuhrman, Shanta Ranjan Saha, Christoper Eckberg, Hyunsoo Kim, David Graf, Fedor Balakirev, John Singleton, Johnpierre N. Paglione, Nicholas Butch
Applied magnetic fields underlie exotic quantum states, such as the fractional quantum Hall effect 1 and Bose-Einstein condensation of spin excitations 2. Superconductivity, on the other hand, is inherently antagonistic towards magnetic fields. Only in

On Low-Energy Tail Distortions in the Detector Response Function of X-Ray Microcalorimeter Spectrometers

November 21, 2019
Author(s)
Galen C. O'Neil, Paul Szypryt, Endre Takacs, Joseph N. Tan, Sean W. Buechele, Aung Naing, Young I. Joe, Daniel S. Swetz, Daniel R. Schmidt, William B. Doriese, Johnathon D. Gard, Carl D. Reintsema, Joel N. Ullom, John S. Villarrubia, Yuri Ralchenko
We use narrow spectral lines from the X-ray spectra of various highly charged ions to measure low-energy tail-like deviations from a Gaussian response function in a microcalorimeter X-ray spectrometer with Au absorbers at energies from 650 to 3320 eV. We

Chalcogenide Topological Insulators

November 15, 2019
Author(s)
Joseph A. Hagmann
The purpose of this chapter is to introduce the reader to the chalcogenide materials systems that host the topological insulator phase of quantum matter. Specifically, the HgTe quantum well 2D topological insulator system and the V2VI3-type bismuth- and

Correlating Decoherence in Transmon Qubits: Low Frequency Noise by Single Fluctuators

November 8, 2019
Author(s)
Steffen Schlor, Jurgen Lisenfeld, Clemens Muller, Alexander Bilmes, Andre Schneider, David P. Pappas, Alexey V. Ustinov, Martin Weides
We report on long-term measurements of a highly coherent, nontunable superconducting transmon qubit, revealing low-frequency burst noise in coherence times and qubit transition frequency. We achieve this through a simultaneous measurement of the qubit's

Flow Resistance & Structures in Viscoelastic Channel Flows at Low Re

November 5, 2019
Author(s)
Boyang Qin, Paul Salipante, Steven Hudson, Paulo E. Arratia
The flow of viscoelastic fluids in channels and pipes remain poorly understood, particularly at low Reynolds numbers. Here, we investigate the flow of polymeric solutions in straight channels using pressure measurements and particle tracking. The law of

Magnetic Ground State and Magnetic Excitations in Black Dioptase Cu 6 Si 6 O 18

November 1, 2019
Author(s)
A. Podlesnyak, O. Prokhnenko, S. E. Nikitin, A. I. Kolesnikov, M. Matsuda, Sachith E. Dissanayake, Timothy R Prisk, H. Nojiri, I. F. Diaz-Ortega, L. M. Anovitz
The low-temperature magnetic properties and magnetic structure of fully dehydrated black dioptase Cu 6Si 6O 18 have been studied by single-crystal neutron diffraction and magnetization measurements in magnetic fields up to 30 T. The intrachain J c and
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