Now showing items 1-20 of 782

    • Absorption Imaging of Ultracold Neutral Plasmas 

      Simien, C.E.; Chen, Y.C.; Gupta, P.; Laha, S.; Martinez, Y.N.; Mickelson, P.G.; Nagel, S.B.; Killian, T.C. (2005-04)
    • Absorption Spectroscopy of an Individual Fano Cluster 

      Yorulmaz, Mustafa; Hoggard, Anneli; Zhao, Hangqi; Wen, Fangfang; Chang, Wei-Shun; Halas, Naomi J.; Nordlander, Peter; Link, Stephan (2016)
      Plasmonic clusters can exhibit Fano resonances with unique and tunable asymmetric line shapes, which arise due to the coupling of bright and dark plasmon modes within each multiparticle structure. These structures are ...
    • Acceleration of laser-driven ion bunch from double-layer thin foils 

      Wang, X.; Yu, W.; Liang, E.; Yu, M.Y. (2012)
      Generation of monoenergetic ion bunch from a double-layer thin-foil target irradiated by an intense linearly polarized laser pulse is investigated using two-dimensional particle-in-cell simulation. The protons in the front ...
    • Active quantum plasmonics 

      Marinica, Dana Codruta; Zapata, Mario; Nordlander, Peter; Kazansky, Andrey K.; Echenique, Pedro M.; Aizpurua, Javier; Borisov, Andrei G. (2015)
      The ability of localized surface plasmons to squeeze light and engineer nanoscale electromagnetic fields through electron-photon coupling at dimensions below the wavelength has turned plasmonics into a driving tool in a ...
    • Adiabatic cooling of atoms by an intense standing wave 

      Chen, Jian; Story, J.G.; Tollett, J.J.; Hulet, Randall G. (1992)
      Lithium atoms channeled in the nodes of an intense standing-wave radiation field are cooled to near the recoil limit by adibatically reducing the radiation intensity. The final momentum distribution has a narrow component ...
    • Alignment of the CMS tracker with LHC and cosmic ray data 

      Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2014)
      The central component of the CMS detector is the largest silicon tracker ever built. The precise alignment of this complex device is a formidable challenge, and only achievable with a significant extension of the technologies ...
    • All-optical production of a lithium quantum gas using narrow-line laser cooling 

      Duarte, P.M.; Hart, R.A.; Hitchcock, J.M.; Corcovilos, T.A.; Yang, T.-L.; Reed, A.; Hulet, R.G. (2011)
      We have used the narrow 2S1/2→3P3/2 transition in the ultraviolet (uv) to laser cool and magneto-optically trap (MOT) 6Li atoms. Laser cooling of lithium is usually performed on the 2S1/2→2P3/2 (D2) transition, and ...
    • Altered Backbone and Side-Chain Interactions Result in Route Heterogeneity during the Folding of Interleukin-1b (IL-1b) 

      Capraro, Dominique T.; Lammert, Heiko; Heidary, David K.; Roy, Melinda; Gross, Larry A.; Onuchic, José N.; Jennings, Patricia A. (2013-08)
      Deletion of the b-bulge trigger-loop results in both a switch in the preferred folding route, from the functional loop packing folding route to barrel closure, as well as conversion of the agonist activity of IL-1b into ...
    • Aluminum Nanocrystals 

      McClain, Michael J.; Schlather, Andrea E.; Ringe, Emilie; King, Nicholas S.; Liu, Lifei; Manjavacas, Alejandro; Knight, Mark W.; Kumar, Ish; Whitmire, Kenton; Everitt, Henry O.; Nordlander, Peter; Halas, Naomi J. (2015)
      We demonstrate the facile synthesis of high purity aluminum nanocrystals over a range of controlled sizes from 70 to 220 nm diameter with size control achieved through a simple modification of solvent ratios in the reaction ...
    • Analysis of in situ images of Bose-Einstein condensates of lithium 

      Bradley, C.C.; Sackett, C.A.; Hulet, R.G. (1997)
      The initial evidence for Bose-Einstein condensation (BEC) of Li7 consisted of image distortions that suddenly appeared as the gas was evaporatively cooled to near the transition temperature. We present results of a model ...
    • Andreev Reflection of Helical Edge Modes in InAs=GaSb Quantum Spin Hall Insulator 

      Knez, Ivan; Du, Rui-Rui; Sullivan, Gerard (2012)
      We present an experimental study of S−N−S junctions, with N being a quantum spin Hall insulator made of InAs/GaSb. A front gate is used to vary the Fermi level into the minigap, where helical edge modes exist [Phys. Rev. ...
    • Angle- and energy-resolved, spin-polarized electron emission spectroscopy to study surface magnetic and electronic properties 

      Rau, C.; Waters, K.; Chen, N. (1990)
      We report on a new technique, spin-polarized electron emission spectroscopy. Using grazing-angle, surface scattering of H+ and He+ ions at Ni(110), we find that the angle-resolved energy distribution of emitted spin-polarized ...
    • Angular analysis and branching fraction measurement of the decay B0→K*0μ+μ− 

      Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Padley,B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2013)
      The angular distributions and the differential branching fraction of the decay B0→K*(892)0μ+μ− are studied using a data sample corresponding to an integrated luminosity of 5.2 fb−1collected with the CMS detector at the LHC ...
    • Angular spin-orbit coupling in cold atoms 

      DeMarco, Michael; Pu, Han (2015)
      We propose coupling two internal atomic states using a pair of Raman beams operated in Laguerre-Gaussian laser modes with unequal phase windings. This generates a coupling between the atom's pseudospin and its orbital ...
    • Anisotropic neutron spin resonance in underdoped superconducting NaFe1−xCoxAs 

      Zhang, Chenglin; Song, Yu; Regnault, L.-P.; Su, Yixi; Enderle, M.; Kulda, J.; Tan, Guotai; Sims, Zachary C.; Egami, Takeshi; Si, Qimiao; Dai, Pengcheng (2014)
      We use polarized inelastic neutron scattering (INS) to study spin excitations in superconducting NaFe0.985Co0.015As (C15) with static antiferromagnetic (AF) order along the a axis of the orthorhombic structure and ...
    • Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions at √sNN=62 and 200 GeV 

      STAR Collaboration; Eppley, G.; Geurts, F.; Llope, W.J.; McDonald, D.; Roberts, J.B.; Yepes, P. (2012)
      We present two-dimensional (2D) two-particle angular correlations measured with the STAR detector on relative pseudorapidity η and azimuth ϕ for charged particles from Au-Au collisions at √sNN=62 and 200 GeV with transverse ...
    • Antiferromagnetic order and spin dynamics in iron-based superconductors 

      Dai, Pengcheng (2015)
      High-transition temperature (high-Tc) superconductivity in the iron pnictides or chalcogenides emerges from the suppression of the static antiferromagnetic order in their parent compounds, similar to copper oxide ...
    • Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe 

      Yu, Rong; Si, Qimiao (2015)
      Motivated by the properties of the iron chalcogenides, we study the phase diagram of a generalized Heisenberg model with frustrated bilinear-biquadratic interactions on a square lattice. We identify zero-temperature phases ...
    • Are chromospheric nanoflares a primary source of coronal plasma? 

      Klimchuk, J.A.; Bradshaw, S.J. (2014)
      It has been suggested that the hot plasma of the solar corona comes primarily from impulsive heating events, or nanoflares, that occur in the lower atmosphere, either in the upper part of the ordinary chromosphere or at ...
    • Artificial topological models based on a one-dimensional spin-dependent optical lattice 

      Zheng, Zhen; Pu, Han; Zou, Xubo; Guo, Guangcan (2017)
      Topological matter is a popular topic in both condensed matter and cold-atom research. In the past decades, a variety of models have been identified with fascinating topological features. Some, but not all, of the models ...