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Displaying 2976 - 3000 of 3362

Enhancement and Reentrance of Spin Triplet Superconductivity in UTe 2 under Pressure

April 14, 2020
Author(s)
Sheng NMN Ran, Hyunsoo Kim, I-Lin Liu, Shanta Ranjan Saha, Ian Hayes, Tristin Metz, Yun Suk Eo, Johnpierre N. Paglione, Nicholas Butch
In a Kondo lattice system, suppression of effective Kondo coupling leads to the breakdown of the heavy-electron metal and a change in the electronic structure^1-4^. Spin triplet superconductivity in the Kondo lattice UTe 2 5 appears to be associated with

Local Quantum Phase Transition in YFe 2 Al^d10

July 3, 2018
Author(s)
W. J. Gannon, L. S. Wu, I. A. Zaliznyak, W. H. Xu, A. M. Tsvelik, Yiming Qiu, Jose Rodriguez Rivera, M. C. Aronson
A phase transition occurs when correlated regions of a new phase grow to span the system and the fluctuations within the correlated regions become long-lived. Here we present neutron scattering measurements showing that this conventional picture must be

Helical Level Structure of Dirac Potential Wells

November 28, 2017
Author(s)
Daniel T. Walkup, Joseph A. Stroscio
In graphene and other massless 2D Dirac materials, Klein tunneling compromises electron confinement, and momentum-space contours can be assigned a Berry phase which is either zero or π. Consequently, in such systems the energy spectrum of circular

Observation of optomechanical buckling phase transitions

March 1, 2017
Author(s)
Jacob M. Taylor, John R. Lawall, Haitan Xu, Utku Kemiktarak, Jingyun Fan, Stephen Ragole
Correlated phases of matter provide long-term stability for systems as diverse as solids, magnets, and potential exotic quantum materials. Mechanical systems, such as relays and buckling transition spring switches can yield similar stability by exploiting

Application of 2D-NMR with Room Temperature NMR Probes for the Assessment of the Higher Order Structure of Filgrastim

January 15, 2017
Author(s)
Robert G. Brinson, Houman Ghasriani, Derek Hodgson, Adams Kristie, Ian McEwen, Kang Chen, Yves Aubin, John P. Marino
The higher order structure (HOS) of biotherapeutics is a critical quality attribute that can be evaluated by nuclear magnetic resonance (NMR) spectroscopy at atomic resolution. NMR spectral mapping of HOS can be used to establish HOS consistency of a

Segmental Deuteration of a-Synuclein for Neutron Reflectometry on Tethered Bilayers

January 5, 2017
Author(s)
Zhiping Jiang, Frank Heinrich, Ryan P. McGlinchey, James M. Gruschus, Jennifer C. Lee
Neutron reflectometry (NR) is uniquely suited for studying protein interaction with phospholipid bilayers. While molecular details along the bilayer normal can be obtained on an Angstrom scale, NR cannot discern specific membrane-bound protein regions due

Programmable Extreme Pseudomagnetic Fields in Graphene by a Uniaxial Stretch

December 8, 2015
Author(s)
Shuze Zhu, Joseph A. Stroscio, Teng Li
Many of the properties of graphene are tied to its lattice structure, allowing for tuning of charge carrier dynamics through mechanical strain. The graphene electro-mechanical coupling yields very large pseudomagnetic fields for small strain fields, up to

A Miniature EBIT with Ion Extraction for Isolating Highly Charged Ions

May 28, 2015
Author(s)
Shannon Hoogerheide, Joseph Tan
We report on the development of a room-temperature miniature electron beam ion trap (EBIT) for efficient production of charge states with relatively low ionization energies. A unitary Penning trap is modified slightly to provide the magnetic field and

Nonproportionality in the scintillation light yield of bismuth germanate

November 11, 2014
Author(s)
Thomas R. Gentile, M J. Bales, H Breuer, T E. Chupp, Kevin J. Coakley, R L. Cooper, Jeffrey S. Nico, B. O'Neill
We present measurements of nonproportionality in the scintillation light yield of bismuth germanate (BGO) for gamma-rays with energies between 6 keV and 662 keV. The scintillation light was read out by avalanche photodiodes (APDs) with both the BGO

The Mott Transition in a Bose Gas Measured Through Time of Flight

January 1, 2014
Author(s)
Ian B. Spielman, Karina Jimenez-Garcia
Ultracold atoms in optical lattices can realize nearly perfect analogs to condensed matter model systems without the complexity present in materials. In this chapter, we thoroughly describe our experimental characterization of the transition from

Dirac fermion heating, current scaling, and direct insulator-quantum Hall transition in multi-layer epitaxial graphene

August 1, 2013
Author(s)
Randolph E. Elmquist, Fan-Hung Liu, Chang-Shun Hsu, Chiashain Chuang, Tak-Pong Woo, Lung-I Huang Huang, Chi-Te Laing, Yasuhiro Fukuyama, Yanfei Yang
We have performed magnetotransport measurements on multi-layer epitaxial graphene. By increasing the driving current I through our graphene devices while keeping the bath temperature fixed, we are able to study Dirac fermion heating and current scaling in

Atomic data for beam-stimulated plasma spectroscopy in fusion plasmas

July 11, 2013
Author(s)
O. Marchuk, Yuri Ralchenko, David R. Schultz, W. Biel, T. Schlummer, TEXTOR Team
Injection of high energy atoms into a confined plasma volume is an established diagnostic technique in fusion research. This method strongly depends on the quality of atomic data for charge exchange spectroscopy (CXRS), motional Stark effect (MSE) and beam

Experimental Evidence for s-Wave Pairing Symmetry in Superconducting Cu_x}Bi_2}Se_3} Single Crystals Using a Scanning Tunneling Microscope

March 12, 2013
Author(s)
Niv Levy, Tong Zhang, Jeonghoon Ha, Fred Sharifi, Alec Talin, Young Kuk, Joseph A. Stroscio
Topological superconductors (TS) are a newly predicted phase of matter which is topologically distinct from conventional superconducting condensates of Cooper pairs. As a manifestation of its topological character, TS supports massless itinerant quasi

A One-Kilogram Quartz Resonator as a Mass Standard

February 1, 2013
Author(s)
David A. Howe, J Vig
The unit of mass, the kilogram, is the last remaining SI base unit defined by an artifact” [1]. This artifact, the primary mass standard, suffers from long term instabilities that are neither well understood, nor easily monitored [2]. A mass standard

Solutions of the Maxwell equations and photon wave functions

November 26, 2009
Author(s)
Peter J. Mohr
Properties of six-component electromagnetic field solutions of a matrix form of the Maxwell equations, analogous to the four-component solutions of the Dirac equation, are described. It is shown that the six-component equation, including sources, is

Ultra-Sensitive Optical Measurements of High-J Transitions in the O2 A-band

November 24, 2009
Author(s)
Daniel K. Havey, Joseph T. Hodges, David A. Long, Mitchio Okumura, Charles E. Miller
We report frequency-stabilized cavity ring-down spectroscopy measurements of high-J O2 A-band magnetic dipole line parameters. Our goals were to measure intensities and line shape parameters for the primary isotopologue of O2 in the A-band region and to
Displaying 2976 - 3000 of 3362
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