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Physics

Condensed matter

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Displaying 701 - 725 of 1253

Assembly of Multi-flavored Two-Dimensional Colloidal Crystals

July 12, 2017
Author(s)
Nathan Mahynski, Hasan Zerze, Harold W. Hatch, Vincent K. Shen, Jeetain Mittal
We systematically investigate the assembly of binary multi-flavored colloidal mixtures in two dimensions. In these mixtures all pairwise interactions between species may be tuned independently. This introduces an additional degree of freedom over more

Complex Three-Dimensional Magnetic Ordering in Segmented Nanowire Arrays

July 12, 2017
Author(s)
Alexander J Grutter, Kathryn Krycka, Elena V. Tartakovskaya, Julie A. Borchers, K. Sai Madhukar Reddy, Eduardo Ortega, Arturo Ponce, Bethanie J. H. Stadler
The first comprehensive three-dimensional picture of magnetic ordering in high-density arrays of segmented FeGa/Cu nanowires is experimentally realized through the application of Polaris small angle neutron scattering. The competing energetics of dipolar

Higgs Amplitude Mode in a Two-Dimensional Quantum Antiferromagnet near the Quantum Critical Point0

July 4, 2017
Author(s)
Tao Hong, Masashige Matsumoto, Yiming Qiu, Wangchun Chen, Thomas R. Gentile, Shannon M. Watson, Firas F. Awwadi, Mark M. Turnbull, Sachith E. Dissanayake, Harish Agrawal, Rasmus Toft-Petersen, Bastian Klemke, Kris Coester, Kai P. Schmidt, David A Tennant
Spontaneous symmetry-breaking quantum phase transitions play an essential role in current condensed matter physics 1-3. The collective excitations in the broken-symmetry phase near the quantum critical point can be characterized by fluctuations of phase

Optical Radiation from Integer Quantum Hall States in Dirac Materials

June 30, 2017
Author(s)
Michael Gullans, Jacob M. Taylor, Mohammad Hafezi
Quantum Hall systems exhibit topologically protected edge states, which can have a macroscopic spatial extent. Such edge states provide a unique opportunity to study a quantum emitter whose size far exceeds the wavelength of emitted light. To better

Quantum Critical Behavior in the Asymptotic Limit of High Disorder in the Medium Entropy Alloy NiCoCr 0.8

June 29, 2017
Author(s)
Brian C. Sales, Ke Jin, Hongbin Bei, John Nichols, Matthew F. Chisholm, F. May, Nicholas Butch, Andrew D. Christianson, Michael A. McGuire
Concentrated solid solutions of transition metal atoms, such as NiCoCr, have extreme chemical disorder within a simple face-centered-cubic crystal structure. These alloys can be grown as large single crystals, and are closely related to the recently

Towards single atom devices for quantum information and metrology: weak localization in embedded phosphorus delta layers in silicon

June 29, 2017
Author(s)
Joseph A. Hagmann, Xiqiao Wang, Pradeep N. Namboodiri, Jonathan E. Wyrick, Roy E. Murray, Michael D. Stewart, Richard M. Silver, Curt A. Richter
The key building block for devices based on the deterministic placement of dopants in silicon is the formation of phosphorus dopant monolayers and the overgrowth of high quality crystalline Si. Lithographically defined dopant delta-layers can be formed

Analytic description of the impact of grain boundaries on Voc

June 26, 2017
Author(s)
Paul M. Haney, Benoit H. Gaury
The impact of grain boundaries on the performance of polycrsytalline photovoltaics remains an open question. We present a simplified description of dark grain boundary recombination current. The dark current takes the form of a diode equation, and the

High-Field Magnetization and Magnetic Phase Diagram of a-Cu 2 V 2 O 7

June 16, 2017
Author(s)
G. Gitgeatpong, M. Suewattana, Shiwei Zhang, A. Miyake, M. Tokunaga, P. Chanlert, N. Kurita, H. Tanaka, T. J. Sato, Yang Zhao, K. Matan
High-field magnetization of the spin-1/2 antiferromagnet α-Cu 2V 2O 7 was measured in pulsed magnetic fields of up to 56 T in order to study its magnetic phase diagram. When the field was applied along the easy axis (the a-axis), two distinct transitions

Quantum Critical Point in the Sc-Doped Itinerant Antiferromagnet TiAu

June 14, 2017
Author(s)
E. Svanidze, T. Besara, J. K. Wang, D. Geiger, L. Prochaska, J. M. Santiago, Jeffrey W. Lynn, S. Paschen, E. Morosan
We present the first experimental realization of a quantum critical point in an itinerant antiferromagnetic realization of a quantum critical point in an intinerant antiferromagnet composed of non-magnetic constituents, TiAu. By partially substituting Ti

First-Order Reversal Curves of the Magnetostructural Transition in FeTe

June 5, 2017
Author(s)
M. K. Frampton, J. Crocker, Dustin A. Gilbert, N. Curro, Kai Liu, J. A. Schneeloch, G. D. Gu, R. J. Zieve
We apply the first-order reversal curve (FORC) method, borrowed from studies of ferromagnetic materials, to the magneto-structural phase transition of Fe 1+yTe. FORC measurements reveal two features in the hysteretic phase transition, even in samples where

Comprehensive circuit model of auto-limiting superconductor devices and systems

May 31, 2017
Author(s)
Jordi Mateu, C Collado, A Hueltes, D Garcia-Pastor, R Perera, Nikhil M. Joshi, Xifeng Lu, Nate Orloff, Jim Booth
This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from the superconductor to the normal state. This phenomenon allows the use of superconductors for the

Gapped Excitations in the High-Pressure Antiferromagnetic Phase of URu 2 Si 2

May 31, 2017
Author(s)
T. J. Williams, H. Barath, Z. Yamani, Jose Rodriguez Rivera, Juscelino Leao, J. D. Garrett, G. M. Luke, W.J. L. Buyers, Collin L. Broholm
We report a neutron scattering study of the magnetic excitation spectrum in each of the three temperature and pressure phases of URu 2Si 2. We find qualitatively similar excitations throughout the (H0L)scattering plane in the hidden order and large moment

Phase Diagram of a-RuCl 3 in an In-Plane Magnetic Field

May 31, 2017
Author(s)
J. A. Sears, Yang Zhao, Zhijun Xu, Jeffrey W. Lynn, Young-June Kim
The low-temperature magnetic phases in the layered honeycomb lattice material α-RuCl 3 have been studied as a function of in-plane magnetic field. In zero field this material orders magnetically below 7 K with so-called zigzag order within the honeycomb

Temperature and Radiation Effects at the Fluorine K-edge in LiF

May 30, 2017
Author(s)
Craig P. Schwartz, Francisco Ponce, Stephan Friedrich, Stephen P. Cramer, John Vinson, David Prendergast
The F K-edge of LiF is studied both experimentally and theoretically as a function of temperature. Instantaneous thermal fluctuations in atomic positions are shown in molecular dynamics simulations to increase in amplitude from 0.029 - 0.064 Å in the

Overlap junctions for high coherence superconducting qubits

May 26, 2017
Author(s)
Xian Wu, Junling Long, Hsiang S. Ku, Russell Lake, Mustafa Bal, David P. Pappas
Fabrication of sub-micron Josephson junctions is demonstrated using standard processing techniques for high-coherence, superconducting qubits. These junctions are made in two separate lithography steps with normal-angle evaporation. Most significantly

Electrical stabilization of surface resistivity in epitaxial graphene systems by amorphous boron nitride encapsulation

May 25, 2017
Author(s)
Albert F. Rigosi, Chieh-I Liu, Nicholas R. Glavin, Yanfei Yang, Heather M. Hill, Jiuning Hu, Angela R. Hight Walker, Curt A. Richter, Randolph E. Elmquist, David B. Newell
Homogeneous monolayer epitaxial graphene (EG) is an ideal candidate for the development of millimeter-sized devices with single-crystal domains. A clean fabrication process was used to produce EG-based devices with n-type doping level of order 10^12 cm^-2

Counting Near Infrared Photons with Microwave Kinetic Inductance Detectors

May 22, 2017
Author(s)
Jiansong Gao, Michael R. Vissers, Joel N. Ullom, Johannes Hubmayr, Joseph W. Fowler, Leila R. Vale, Weijie Guo
We demonstrate photon counting at 1550~nm wavelength using microwave kinetic inductance detectors (MKIDs) made from TiN/Ti/TiN trilayer films with superconducting transition temperature $T_{c} \sim$ 1.4~K. The detector has a lump-element design with a

Trion Valley Coherence in Monolayer Semiconductors

May 22, 2017
Author(s)
Kai Hao, Lixiang Xu, Wu Fengcheng, Philip Nagler, Kha Tran, Xin Ma, Tobias Korn, Allan H. MacDonald, Xiaoqin Li, Galan Moody
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating optical generation and manipulation of exciton valley coherence (the

Preservation of surface conductivity and dielectric loss tangent in large-scale, encapsulated epitaxial graphene measured by non-contact microwave cavity perturbations

May 19, 2017
Author(s)
Albert F. Rigosi, Nicholas R. Glavin, Chieh-I Liu, Yanfei Yang, Jan Obrzut, Heather M. Hill, Jiuning Hu, Hsin Y. Lee, Angela R. Hight Walker, Curt A. Richter, Randolph E. Elmquist, David B. Newell
Regarding the improvement of current quantized Hall resistance (QHR) standards, one promising avenue is the growth of homogeneous monolayer epitaxial graphene (EG). A clean and simple process was used to produce large, precise areas of EG. Properties like
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