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Physics

Atomic / Molecular / Quantum

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Displaying 476 - 500 of 702

Contact resistance and phase slips in mesoscopic superfluid atom transport

June 15, 2016
Author(s)
Stephen Eckel, Jeffrey Lee, Fred Jendrejewski, Christopher Lobb, Gretchen K. Campbell, Wendell Hill
We have experimentally measured both resistive flow and superflow with bosonic atoms in a mesoscopic transport experiment. Our system, consisting of two Bose-Einstein condensates coupled by a narrow channel, shows resistive flow for currents above a

Geometrical pumping with a Bose-Einstein condensate

May 20, 2016
Author(s)
Lauren M. Aycock, Dina Genkina, Seiji Sugawa, Max Schemmer, Hsin I Lu, Ian Spielman
We realized a quantum "charge" pump for a Bose-Einstein condensate (BEC) in a novel bipartite magnetic lattice, whose bands are characterized by non-trivial topological invariants: the Zak phases. For each band, the Zak phase is determined by that band's

Realizing Exactly Solvable SU(N) Magnets with Thermal Atoms

May 6, 2016
Author(s)
Michael Beverland, Gorjan Alagic, Michael Martin, Andrew Koller, Ana Maria Rey, Alexey Gorshkov
We show that n thermal fermionic alkaline-earth atoms in a flat-bottom trap allow one to robustly implement a spin model displaying two symmetries: the Sn symmetry that swaps atoms occupying different vibrational levels of the trap and the SU(N) symmetry

Bayesian Calibration of Transferable, Coarse-Grained Force Fields

April 15, 2016
Author(s)
Thomas W. Rosch, Frederick R. Phelan Jr., Paul Patrone
Generating and calibrating forces that are transferable across a range of state-points remains a challenging problem in coarse-grained (CG) molecular dynamics (MD). In this work, we present a Bayesian correction algorithm, inspired by ideas from

The Eighth Industrial Fluid Properties Simulation Challenge

January 31, 2016
Author(s)
Daniel Siderius, Vincent K. Shen, Raymond D. Mountain, Nathan E. Schultz, Riaz Ahmad, John K. Brennan, Kevin A. Frankel, Jonathan D. Moore, Richard B. Ross, Matthias Thommes, Kenneth D. Smith
The goal of the eighth industrial fluid properties simulation challenge was to test the ability of molecular simulation methods to predict the adsorption of organic adsorbates in activated carbon materials. In particular, the eighth challenge focused on

Accurate multiconfiguration calculations of energy levels, lifetimes and transition rates for the silicon isoelectronic sequence: Ti IX - Ge XIX, Sr XXV, Zr XXVII, Mo XXIX

December 6, 2015
Author(s)
P. Jonsson, L Radziute, G. Gaigalas, M. Godefroid, J P. Marques, T Brage, Charlotte F. Fischer, I. P. Grant
Multiconfiguration Dirac-Hartree-Fock (MCDHF) calculations and relativistic configuration interaction (RCI) calculations are performed for states of the 3s23p2, 3s3p3 and 3s23p3d configurations in the Si-like ions Ti IX - Ge XIX, Sr XXV, Zr XXVII, Mo XXIX

Emergence of chaotic scattering in ultracold Er and Dy

November 19, 2015
Author(s)
T. Maier, H Kadau, M. Schmitt, M. Wenzel, I. Ferrier-Barbut, T. Pfau, A. Frisch, S. Baier, K. Aikawa, L. Chomaz, Mark M.J., F. Ferlaino, Constantinos Makrides, A Petrov, Svetlana A. Kotochigova, Eite Tiesinga
We show that for complex and magnetic atoms chaotic scattering behavior emerges due to anisotropic inter- action potentials and finite Zeeman coupling. This generic behavior is studied in a collaborative effort for both ultracold dysprosium and erbium

A Source for Mesoscopic Quantum Optics

October 22, 2015
Author(s)
Georg Harder, Timothy J. Bartley, Adriana Lita, Sae Woo Nam, Thomas Gerrits, Christine Silberhorn
The nature of quantum decoherence renders the observation of nonclassical features/properties in large systems increasingly difficult. Optical states are a good candidate to observe nonclassical features since 5 they are less susceptible to environmental

Coulomb bound states of strongly interacting photons

September 18, 2015
Author(s)
Mohammad F. Maghrebi, Michael Gullans, Przemek Bienias, Soonwon Choi, Ivar Martin, Ofer Firstenberg, Mikhail D. Lukin, Hans Peter Buchler, Alexey Gorshkov
We show that two photons coupled to Rydberg states via electromagnetically induced transparency can interact via an effective Coulomb potential. This interaction gives rise to a continuum of two-body bound states. Within the continuum, metastable bound

Optomechanical Raman-Ratio Thermometry

September 9, 2015
Author(s)
Katarina Cicak, Thomas P. Purdy, Pen Li Yu, Nir Kampel, Bob Peterson, Raymond Simmonds, Cindy Regal
The temperature dependence of the asymmetry between Stokes and anti-Stokes Raman scattering can be exploited for self-calibrating, optically-based thermometry. In the context of cavity optomechanics, we observe the cavity-enhanced scattering of light

Experiments with highly-ionized atoms in unitary Penning traps

August 14, 2015
Author(s)
Shannon Hoogerheide, Aung Naing, Joan M. Dreiling, Samuel Brewer, Nicholas D. Guise, Joseph Tan
Highly-ionized atoms with special properties have been proposed for interesting applications, including potential candidates for a new generation of optical atomic-clocks at the 1 part in 1019 level of precision, quantum-information processing, and tests

Dew-point Measurements For Water In Compressed Carbon Dioxide

August 6, 2015
Author(s)
Christopher W. Meyer, Allan H. Harvey
When transporting CO2 for sequestration, it is important to know the water dew point in order to avoid condensation that can lead to corrosion. We have constructed a flow apparatus to measure the water content at saturation in a compressed gas. A saturator

Formation of Strain Induced Quantum Dots in Gated Semiconductor Nanostructures

August 5, 2015
Author(s)
Ted C. Thorbeck, Neil M. Zimmerman
Elastic strain changes the energies of the conduction and valence bands in a semiconductor, which will affect transport through a semiconductor nanostructure. We show that the typical strains in a semiconductor nanostructure arising from metal gates or

Quantum-correlated photon pairs generated in commercial 45 nm complementary metal-oxide semiconductor microelectronics

July 7, 2015
Author(s)
Cale M. Gentry, Jeff Shainline, Mark W. Wade, Martin Stevens, Shellee D. Dyer, Xiaoge Zeng, Fabio Pavanello, Thomas Gerrits, Sae Woo Nam, Richard Mirin, Milos A. Popovic
Correlated photon pairs are a fundamental component of quantum photonic systems. While pair sources have previously been integrated on silicon chips in custom facilities, these often take advantage of only a small fraction of microelectronics fabrication

Optimization of collisional Feshbach cooling of an ultracold non degenerate gas

April 20, 2015
Author(s)
Marlon Nuske, L. Mathey, Eite Tiesinga
We optimize a collision-induced cooling process for ultracold atoms in the nondegenerate regime. It makes use of a Feshbach resonance, instead of rf radiation in evaporative cooling, to selectively expel hot atoms from a trap. Using functional minimization

Fractional Quantum Hall States of Rydberg Polaritons

March 31, 2015
Author(s)
Mohammad F. Maghrebi, Norman Y. Yao, Mohammad Hafezi, Thomas Pohl, Ofer Firstenberg, Alexey Gorshkov
We propose a scheme for realizing fractional quantum Hall states of light. In our scheme, photons of two polarizations are coupled to Rydberg atoms via auxiliary classical control fields to form two flavors of Rydberg polaritons, effective spin up and spin
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