Now showing items 526-545 of 892

    • Pair extended coupled cluster doubles 

      Henderson, Thomas M.; Bulik, Ireneusz W.; Scuseria, Gustavo E. (2015)
      The accurate and efficient description of strongly correlated systems remains an important challenge for computational methods. Doubly occupied configuration interaction (DOCI), in which all electrons are paired and ...
    • Pairing and Phase Separation in a Polarized Fermi Gas 

      Partridge, Guthrie B.; Li, Wenhui; Kamar, Ramsey I.; Liao, Yean-an; Hulet, Randall G. (2006)
      We report the observation of pairing in a gas of atomic fermions with unequal numbers of two components. Beyond a critical polarization, the gas separates into a phase that is consistent with a superfluid paired core ...
    • Pairing correlations near a Kondo-destruction quantum critical point 

      Pixley, J.H.; Deng, Lili; Ingersent, Kevin; Si, Qimiao (2015)
      Motivated by the unconventional superconductivity observed in heavy-fermion metals, we investigate pairing susceptibilities near a continuous quantum phase transition of the Kondo-destruction type. We solve two-impurity ...
    • Particle-particle and quasiparticle random phase approximations: Connections to coupled cluster theory 

      Scuseria, Gustavo E.; Henderson, Thomas M.; Bulik, Ireneusz W. (2013)
      We establish a formal connection between the particle-particle (pp) random phase approximation (RPA) and the ladder channel of the coupled cluster doubles (CCD) equations. The relationship between RPA and CCD is best ...
    • Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV 

      CMS Collaboration; Adair, A.; Boulahouache, C.; Cuplov, V.; Ecklund, K.M.; Geurts, F.J.M.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2012)
      The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 pb−1 of data collected in pp collisions at √s = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria ...
    • Performance of the CMS missing transverse momentum reconstruction in pp data at √s = 8 TeV 

      CMS Collaboration; Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2015)
      The performance of missing transverse energy reconstruction algorithms is presented using √s=8 TeV proton-proton (pp) data collected with the CMS detector. Events with anomalous missing transverse energy are studied, and ...
    • The performance of the CMS muon detector in proton-proton collisions at √s = 7 TeV at the LHC 

      CMS Collaboration; Adair, A.; Akgun, B.; Boulahouache, C.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2013)
      The performance of all subsystems of the CMS muon detector has been studied by using a sample of proton-proton collision data at √s = 7 TeV collected at the LHC in 2010 that corresponds to an integrated luminosity of ...
    • Performance of τ-lepton reconstruction and identification in CMS 

      CMS Collaboration; Adair, A.; Boulahouache, C.; Ecklund, K.M.; Geurts, F.J.M.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2012)
      The performance of τ-lepton reconstruction and identification algorithms is studied using a data sample of proton-proton collisions at √s = 7 TeV, corresponding to an integrated luminosity of 36 pb−1 collected with the CMS ...
    • Permanent magnet trap for cold atoms 

      Tollett, J.J.; Bradley, C.C.; Sackett, C.A.; Hulet, R.G. (1995)
      We report the trapping of neutral atoms in a permanent magnet trap. Approximately 1×10˄8 ground-state lithium atoms have been confined in a nonzero magnetic-field minimum produced by six permanent magnets in an Ioffe ...
    • Petawatt laser absorption bounded 

      Levy, Matthew C.; Wilks, Scott C.; Tabak, Max; Libby, Stephen B.; Baring, Matthew G. (2014)
      The interaction of petawatt (1015W) lasers with solid matter forms the basis for advanced scientific applications such as table-top particle accelerators, ultrafast imaging systems and laser fusion. Key metrics for these ...
    • Phase coherence and superfluid-insulator transition in a disordered Bose-Einstein condensate 

      Chen, Yong P.; Hitchcock, J.; Dries, D.; Junker, M.; Welford, C.; Hulet, R.G. (2008)
      We have studied the effects of a disordered optical potential on the transport and phase coherence of a Bose-Einstein condensate (BEC) of L7i atoms. At moderate disorder strengths (VD), we observe inhibited transport and ...
    • Phase diagram and neutron spin resonance of superconducting NaFe1−xCuxAs 

      Tan, Guotai; Song, Yu; Zhang, Rui; Lin, Lifang; Xu, Zhuang; Tian, Long; Chi, Songxue; Graves-Brook, M.K.; Li, Shiliang; Dai, Pengcheng (2017)
      We use transport and neutron scattering to study the electronic phase diagram and spin excitations of NaFe1−xCuxAs single crystals. Similar to Co- and Ni-doped NaFeAs, a bulk superconducting phase appears near x≈2% with ...
    • Phase diagram of a strongly interacting spin-imbalanced Fermi gas 

      Olsen, Ben A.; Revelle, Melissa C.; Fry, Jacob A.; Sheehy, Daniel E.; Hulet, Randall G. (2015)
      We obtain the phase diagram of spin-imbalanced interacting Fermi gases from measurements of density profiles of Li6 atoms in a harmonic trap. These results agree with, and extend, previous experimental measurements. ...
    • Phase separation, competition, and volume-fraction control in NaFe1−xCoxA 

      Ma, Long; Dai, J.; Wang, P.S.; Lu, R.; Song, Yu; Zhang, Chenglin; Tan, G.T.; Dai, Pengcheng; Hu, D.; Li, S.L.; Normand, B.; Yu, Weiqiang (2014)
      We report a detailed nuclear magnetic resonance (NMR) study by combined Na23 and As75 measurements over a broad range of doping to map the phase diagram of NaFe1−xCoxAs. In the underdoped regime (x≤0.017), we find a magnetic ...
    • Phenotypic plasticity in prostate cancer: role of intrinsically disordered proteins 

      Mooney, Steven M.; Jolly, Mohit Kumar; Levine, Herbert; Kulkarni, Prakash (2016)
      A striking characteristic of cancer cells is their remarkable phenotypic plasticity, which is the ability to switch states or phenotypes in response to environmental fluctuations. Phenotypic changes such as a partial or ...
    • Photoabsorption by Ultracold Atoms and the Scattering Length 

      Côté, R.; Dalgarno, A.; Sun, Y.; Hulet, R.G. (1995)
      It is shown that photoabsorption in a gas of ultracold atoms depends on the sign and magnitude of the scattering length in the scattering of a pair of atoms. Measurements of fluorescence in 7Li are interpreted to show that ...
    • Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance 

      Junker, M.; Dries, D.; Welford, C.; Hitchcock, J.; Chen, Y.P.; Hulet, R.G. (2008)
      We measure the effect of a magnetic Feshbach resonance (FR) on the rate and light-induced frequency shift of a photoassociation resonance in ultracold Li7. The photoassociation-induced loss-rate coefficient Kp depends ...
    • Photoassociative frequency shift in a quantum degenerate gas 

      Gerton, Jordan M.; Frew, Brian J.; Hulet, Randall G. (2001)
      A light-induced frequency shift is observed in single-photon photoassociative spectra of magnetically trapped, quantum degenerate 7Li. The shift is a manifestation of the coupling between the threshold continuum scattering ...
    • Photoassociative Spectroscopy at Long Range in Ultracold Strontium 

      Nagel, S.B.; Mickelson, P.G.; Saenz, A.D.; Martinez, Y.N.; Chen, Y.C.; Killian, T.C.; Pellegrini, P.; Cote, R. (2005-03-03)
    • Photoinduced force mapping of plasmonic nanostructures 

      Tumkur, Thejaswi U.; Yang, Xiao; Cerjan, Benjamin; Halas, Naomi J.; Nordlander, Peter; Thomann, Isabell (2016)
      The ability to image the optical near-fields of nanoscale structures, map their morphology and concurrently obtain spectroscopic information, all with high spatiotemporal resolution, is a highly sought-after technique in ...