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Physics

Atomic / Molecular / Quantum

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Displaying 426 - 450 of 702

An energy-resolved atomic scanning probe

November 21, 2018
Author(s)
Daniel S. Gruss, Chih-Chun Chien, Julio T. Barreiro, Massimiliano Di Ventra, Michael P. Zwolak
The density of states is a concept that is ubiquitous in classical and quantum physics, since it quantifies the energy distribution of states available in a system. Spectroscopic means allow its measurement over the entirety of a system's energy spectrum

Observation of bound state self-interaction in a nano-eV atom collider

November 20, 2018
Author(s)
R Thomas, M. Chilcott, A. Deb, Eite Tiesinga, N. Kjaergaard
Quantum mechanical scattering resonances for colliding particles occur when a continuum scattering state couples to a discrete bound state between them. The coupling also causes the bound state to interact with itself via the continuum and leads to a shift

Periodic Table of the Elements

November 3, 2018
Author(s)
Karen Olsen
The periodic table contains NIST's latest critically evaluated data for atomic properties of the elements.

Methods for preparation and detection of neutron spin-orbit states

October 10, 2018
Author(s)
Michael G. Huber, D. Sarenac, J. Nsofini, I. Hincks, David Cory, Muhammad D. Arif, Charles W. Clark, D. A. Pushin
The generation and control of neutron orbital angular momentum (OAM) states and spin correlated OAM (spin-orbit) states provides a powerful probe of materials with unique penetrating abilities and magnetic sensitivity. We describe techniques to prepare and

Optical lattice with torus topology

September 26, 2018
Author(s)
Hwanmun Kim, Guanyu Zhu, James V. Porto, Mohammad Hafezi
We propose an experimental scheme to construct an optical lattice where the atoms are confined to the surface of a torus. This construction can be realized with spatially shaped laser beams which could be realized with recently developed high resolution

Bose Condensation of Photons Thermalized via Laser Cooling of Atoms

August 31, 2018
Author(s)
Chiao Wang, Michael Gullans, James V. Porto, William D. Phillips, Jacob Taylor
A Bose-Einstein condensate (BEC) is a quantum phase of matter achieved at low temperatures.Photons, one of the most prominent species of bosons, do not typically condense due to the lackof a particle number-conservation. We recently described a photon

Development and Applications of a Fiber-Coupled Atom-Based Electric Field Probe

August 26, 2018
Author(s)
Christopher L. Holloway, Matt Simons, Josh Gordon
We are developing a fundamentally new atom-based approach for electric (E) field measurements. This new approach will lead to a self-calibrated, SI traceable, E-field measurement, and has the capability to perform measurements on a fine spatial resolution

High-resolution near-field imaging and far-fieldantenna measurements with atomic sensors

August 26, 2018
Author(s)
Christopher L. Holloway, Matt Simons, Dave Anderson, Georg Raithel
—Measurements of radio-frequency (RF) electric fields using atomic sensors based on quantum-optical spectroscopy of Rydberg states in vapors has garnered significant interest in recent years for the establishment of atomic standards for RF electric fields

Optical Properties of Meloxicam in the Far-Infrared Spectral Region

August 17, 2018
Author(s)
Yusuf S. Aytekin, Mustafa Koturk, Adam Zaczek, Timothy M. Korter, Edwin J. Heilweil, Okan Esenturk
One of the most commonly used nonsteroidal anti-inflammatory active pharmaceutical ingredient called Meloxicam has been characterized spectroscopically both by Terahertz (THz) time domain spectroscopy (THz-TDS) and by Fourier Transform Infrared (FTIR)

Spinor Bose-Einstein condensate phase-sensitive amplifier for SU(1,1) interferometry

August 16, 2018
Author(s)
Jonathan Wrubel, Arne Schwettmann, Donald P. Fahey, Glassmann Zachary, Heywon Pechkis, Paul Griffin, Ryan Barnett, Eite Tiesinga
The SU(1,1) interferometer was originally conceived as a Mach-Zehnder interferometer with the beam-splitters replaced by parametric amplifiers. The parametric amplifiers produce states with correlations that result in enhanced phase sensitivity. F = 1

Photon thermalization via laser cooling of atoms

July 19, 2018
Author(s)
Chiao-Hsuan Wang, Michael Gullans, James V. Porto, William D. Phillips, Jacob Taylor
The cooling of atomic motion by scattered light enables a wide variety of technological and scientific explorations. Here we focus on laser cooling from the perspective of the light — specifi- cally, the scattering of light between different optical modes

A low-steering piezo-driven mirror

July 18, 2018
Author(s)
Eric Magnan, James Maslek, Carlos Bracamontes-Palma, Alessandro Restelli, Thomas Boulier, James V. Porto
We present a piezo-driven translatable mirror with excellent pointing stability, capable of driving at frequencies up to tens of kilohertz. Our system uses a tripod of piezo actuators with independently controllable drive voltages, where the ratios of the

Recent Developments in Surface Science and Engineering, Thin Films, Nanoscience, Biomaterials, Plasma Science, and Vacuum Technology

May 31, 2018
Author(s)
Miran Mozetic, Alenka Vesel, Gregor Primc, J. Bauer, A. Eder, G. H. S. Schmid, David Ruzic, Zeeshan Ahmed, Daniel Barker, Kevin O. Douglass, Stephen Eckel, James A. Fedchak, Jay H. Hendricks, Nikolai Klimov, Jacob Edmond Ricker, Julia Scherschligt, Jack A. Stone Jr., Gregory F. Strouse, I. Capan, M Buljan, S. Milosevic, C Teichert, S R. Cohen, A G. Silva, M Lehocky, P Humpolicek, C Rodriguez, J Hernandez-Montelongo, E Punzon-Quijorna, D Mercier, M Manso-Silvan, G Ceccone, A Galtayries, K Stana-Kleinschek, I Petrov, J E. Greene, J Avila, C Y. Chen, B Caja, H Yi, A Boury, S Lorcy, M C. Asensio, T Gans, D O?Connell, F Reniers, A Vincze, M Anderle
Nanometer-sized structures, surfaces and sub-surface phenomena have played an enormous role in science and technological applications and represent a driving-force of current interdisciplinary science. Recent developments include the atomic-scale

Energy Renormalization Method for the Coarse-Graining of Polymer Viscoelasticity

May 10, 2018
Author(s)
Jake Song, David D. Hsu, Kenneth R. Shull, Frederick R. Phelan Jr., Jack F. Douglas, Wenjie Xia, Sinan Keten
Developing time and temperature transferable coarse-grained (CG) models is essential for the computational prediction and design of polymeric glass-forming materials, but this goal has remained elusive. The dynamics of CG models are often greatly altered

High-precision measurements of n = 2 - n = 1 transition energies and level widths in He- and Be- like Argon Ions

March 26, 2018
Author(s)
Jorge Machado, Csilla Szabo-Foster, Jose Paulo Santos, Pedro Amaro, Mauro Guerra, Guojie Bian, Jean-Michel Isac, Paul Indelicato
We have performed a reference-free measurement of the transition energies of the 1s2p1P1 → 1s2 1S0 line in He-like argon, and of the 1s2s22p 1P1 → 1s22s2 1S0 line in Be-like argon ions. The highly-charged ions were produced in the plasma of an Electron

Dark state optical lattice with sub-wavelength spatial structure

February 20, 2018
Author(s)
Sarthak Subhankar, Tsz-Chun Tsui, James V. Porto, Steve Rolston, Przemek Bienias, Alexey Gorshkov, Mateusz Lacki, Michael Baranov, Peter Zoller
We report on the experimental realization of a conservative optical lattice for cold atoms with sub-wavelength spatial structure. The potential is based on the nonlinear optical response of three- level atoms in laser-dressed dark states, which is not

Energy Renormalization to Coarse-Graining of the Dynamics of a Model Glass-Forming Liquid

February 5, 2018
Author(s)
Wenjie Xia, Jake Song, Nitin Hansoge, Frederick R. Phelan Jr., Sinan Keten, Jack F. Douglas
Soft condensed matters characteristically exhibit a strong temperature dependence of relaxation properties due to glass formation, but currently no effective temperature transferable coarse- graining method exists that allows for the prediction of their

Vanadium Transitions in the Spectrum of Arcturus

February 1, 2018
Author(s)
Michael P. Wood, Chris Sneden, James E. Lawler, E. A. Den Hartog, John J. Cowan, Gillian Nave
We derive a new abundance for vanadium in the bright, mildly metal-poor red giant Arcturus. This star has an excellent high-resolution spectral atlas and well-understood atmospheric parameters, and it displays a rich set of neutral vanadium lines that are

Spontaneous avalanche dephasing in large Rydberg ensembles

November 13, 2017
Author(s)
Thomas L. Boulier, Eric Magnan, Carlos Bracamontes, James Maslek, Elizabeth Goldschmidt, Jeremey Young, Alexey Gorshkov, Steven Rolston, James V. Porto
Strong dipole-exchange interactions due to spontaneously produced contaminant states can trigger rapid dephasing in many-body Rydberg ensembles [E. Goldschmidt et al., PRL 116, 113001 (2016)]. Such broadening has serious implications for many proposals to

Development of a new UHV/XHV pressure standard (Cold Atom Vacuum Standard)

November 10, 2017
Author(s)
Julia Scherschligt, James A. Fedchak, Daniel Barker, Stephen Eckel, Nikolai Klimov, Constantinos Makrides, Eite Tiesinga
The National Institute of Standards and Technology has recently begun a program to develop a primary pressure standard that is based on ultra-cold atoms, covering a pressure range of 1 × 10-6 Pa to 1 × 10-10 Pa and possibly lower. These pressures
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