Now showing items 21-40 of 107

    • Dark Matter and enhanced h -> gamma gamma rate from vector-like Leptons 

      Joglekar, Aniket; Schwaller, Pedro; Wagner, Carlos E. M. (Springer Verlag, 2012-12)
      In this paper, we study an extension of the standard model with a vector-like generation of leptons. This model provides a viable dark matter candidate and a possibility to enhance the Higgs decay rate into a pair of ...
    • Dark side of the Higgs boson 

      Low, Ian; Schwaller, Pedro; Shaughnessy, Gabe; Wagner, Carlos E. M. (American Physical Society, 2012-01)
      Current limits from the Large Hadron Collider exclude a standard model-like Higgs mass above 150 GeV, by placing an upper bound on the Higgs production rate. We emphasize that, alternatively, the limit could be interpreted ...
    • Density functional theory analysis of hexagonal close-packed elemental metal photocathodes 

      Li, T.; Rickman, BL; Schroeder, WA (American Physical Society, 2015-07)
      A density function theory based analysis of photoemission from hexagonal close packed (hcp) metals is presented and the calculated values of the rms transverse momentum (ΔpT) are in good agreement with the available ...
    • Density functional versus spin-density functional and the choice of correlated subspace in multivariable effective action theories of electronic structure 

      Park, H.; Millis, AJ; Marianetti, CA (American Physical Society, 2015-07-27)
      Modern extensions of density functional theory such as the density functional theory plus U and the density functional theory plus dynamical mean field theory require choices, including selection of variable (charge vs ...
    • Differential conductance and defect states in the heavy-fermion superconductor CeCoIn5. 

      Van Dyke, JS; Davis, JCS; Morr, DK (American Physical Society, 2016-01-22)
      We demonstrate that the electronic band structure extracted from quasiparticle interference spectroscopy [Nat. Phys. 9, 468 (2013)] and the theoretically computed form of the superconducting gaps [Proc. Natl. Acad. Sci. ...
    • Differential conductance and quantum interference in kondo systems 

      Figgins, Jeremy; Morr, Dirk K. (American Physical Society, 2010-05-06)
      We present a large-N theory for the differential conductance, dI=dV, in Kondo systems measured via scanning tunneling spectroscopy. We demonstrate that quantum interference between tunneling processes into the conduction ...
    • Diffusion and self-assembly of C60 molecules on monolayer graphyne sheets. 

      Ozmaian M; Fathizadeh A; Jalalvand M; Ejtehadi MR; Allaei SM (Nature Publishing Group, 2016-02-25)
      The motion of a fullerene (C60) on 5 different types of graphyne is studied by all-atom molecular dynamics simulations and compared with former studies on the motion of C60 on graphene. The motion shows a diffusive behavior ...
    • Diffusion self-assembly of C-60 molecules on monolayer graphyne sheets. 

      Ozmaian, M; Fathizadeh, A; Jalalvand, M; Ejtehadi, MR; Allaei, SMV (Nature Publishing Group, 2016-02-25)
      The motion of a fullerene (C-60) on 5 different types of graphyne is studied by all-atom molecular dynamics simulations and compared with former studies on the motion of C-60 on graphene. The motion shows a diffusive ...
    • Direct observation of the structural and electronic changes of Li2MnO3 during electron irradiation 

      Phillips, P.J.; Iddir, H.; Abraham, D.P.; Klie, R.F. (American Institute of Physics, 2014)
      This study focuses on the effects of electron beam induced irradiation to the layered oxide Li2MnO3. Aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy are used to ...
    • Disorder and quasiparticle interference in heavy-fermion materials 

      Toldin, Francesco Parisen; Figgins, Jeremy; Kirchner, Stefan; Morr, Dirk K. (American Physical Society, 2013-08)
      Using a large-N approach, we study the effect of disorder in the Kondo-screened phase of heavy-fermion materials. We demonstrate that the strong feedback between the hybridization and the conduction electron charge density ...
    • Doping dependence of the specific heat of single-crystal BaFe2(As1-xPx)2 

      Chaparro, C.; Fang, L.; Claus, H.; Rydh, A.; Crabtree, G. W.; Stanev, V.; Kwok, W. K.; Welp, U. (American Physical Society, 2012-05)
      We present specific heat measurements on a series of BaFe2(As1-xPx )2 single crystals with phosphorous doping ranging from x = 0.3 to x = 0.55. Our results reveal that BaFe2(As1-xPx )2 follows the scaling C/Tc ≈ T ...
    • Electric Field Effect on Phospholipid Monolayers at an Aqueous-Organic Liquid-Liquid Interface 

      Yu, H.; Yzeiri, I.; Hou, B.; Chen, C-H; Bu, W.; Vanysek, P.; Chen, Y-S; Lin, B.; Král, P.; Schlossman, ML (American Chemical Society, 2014-10)
      The electric potential difference across cell membranes, known as the membrane potential, plays an important role in the activation of many biological processes. To investigate the effect of the membrane potential on the ...
    • Electro-Optical Characterization of MWIR InAsSb Detectors 

      D’Souza, A.I.; Robinson, E.; Ionescu, A. C.; Okerlund, D.; de Lyon, T. J.; Sharifi, H.; Roebuck, M.; Yap, D.; Rajavel, R. D.; Dhar, N.; Wijewarnasuriya, P. S.; Grein, Christoph (Institute of Electrical and Electronics Engineers, 2012-10)
      InAs1-xSbx material with an alloy composition of the absorber layer adjusted to achieve 200K cutoff wavelengths in the 5 μm range has been grown. Compound-barrier (CB) detectors were fabricated and tested for optical ...
    • Emergence of coherence in the charge-density wave state of 2H-NbSe2 

      Chatterjee, U.; Zhao, J.; Iavarone, M.; Di Capua, R.; Castellan, J.P.; Karapetrov, G. (Nature Publishing Group, 2015-02-17)
      A charge-density wave (CDW) state has a broken symmetry described by a complex order parameter with an amplitude and a phase. The conventional view, based on clean, weak-coupling systems, is that a finite amplitude and ...
    • Energy dependence of directed flow over a wide range of pseudorapidity in Au + Au collisions at the BNL relativistic heavy ion collider 

      Back, B.B.; Baker, M.D.; Ballintijn, M.; Barton, D.S.; Betts, R.R.; Bickley, A.A.; Bindel, R.; Budzanowski, A.; Busza, W.; Carroll, A.; Chai, Z.; Decowski, M.P.; Garcia, E.; Gburek, T.; George, N.; Gulbrandsen, K.; Gushue, S.; Halliwell, C.; Hamblen, J.; Hauer, M.; Heintzelman, G.A.; Henderson, C.; Hofman, D.J.; Hollis, R.S.; Holynnski, R.; Holzman, B.; Iordanova, A.; Johnson, E.; Kane, J.L.; Katzy, J.; Khan, N.; Kucewicz, W.; Kulinich, P.; Kuo, C.M.; Lin, W.T.; Manly, S.; McLeod, D.; Mignerey, A.C.; Nouicer, R.; Olszewski, A.; Pak, R.; Park, I.C.; Pernegger, H.; Reed, C.; Remsberg, L.P.; Reuter, M.; Roland, C.; Roland, G.; Rosenberg, L.; Sagerer, J.; Sarin, P.; Sawicki, P.; Seals, H.; Sedykh, I.; Skulski, W.; Smith, C.E.; Stankiewicz, M.A.; Steinberg, P.; Stephans, G.S.F.; Sukhanov, A.; Tang, J.L.; Tonjes, M.B.; Trzupek, A.; Vale, C.; van Nieuwenhuizen, G.J.; Vaurynovich, S.S.; Verdier, R.; Veres, G.I.; Wenger, E.; Wolfs, F.L.H.; Wosiek, B.; Wozniak, K.; Wuosmaa, A.H.; Wyslouch, B. (American Physical Society, 2006-07-07)
      We report on measurements of directed flow as a function of pseudorapidity in Au + Au collisions at energies of root s(NN) = 19.6, 62.4, 130 and 200 GeV as measured by the PHOBOS detector at the BNL Relativistic Heavy Ion ...
    • Energy dependence of elliptic flow over a large pseudorapidity range in Au + Au collisions at the BNL relativistic heavy ion collider 

      Back, BB; Baker, MD; Ballintijn, M; Barton, DS; Betts, RR; Bickley, AA; Bindel, R; Budzanowski, A; Busza, W; Carroll, A; Chai, Z; Decowski, MP; Garcıa, E; Gburek, T; George, N; Gulbrandsen, K; Gushue, S; Halliwell, C; Hamblen, J; Hauer, M; Heintzelman, GA; Henderson, C; Hofman, DJ; Hollis, RS; Hołynski, R; Holzman, B; Iordanova, A; Johnson, E; Kane, JL; Katzy, J; Khan, N; Kucewicz, W; Kulinich, P; Kuo, CM; Lin, WT; Manly, S; McLeod, D; Mignerey, AC; Nouicer, R; Olszewski, A; Pak, R; Park, IC; Pernegger, H; Reed, C; Remsberg, LP; Reuter, M; Roland, C; Roland, G; Rosenberg, L; Sagerer, J; Sarin, P; Sawicki, P; Seals, H; Sedykh, I; Skulski, W; Smith, CE; Stankiewicz, MA; Steinberg, P; Stephans, GSF; Sukhanov, A; Tang, JL; Tonjes, MB; Trzupek, A; Vale, C; van Nieuwenhuizen, GJ; Vaurynovich, SS; Verdier, R; Veres, GI; Wenger, E; Wolfs, FLH; Wosiek, B; Wozniak, K; Wuosmaa, AH; Wysłouch, B (American Physical Society, 2005-04-01)
      This Letter describes the measurement of the energy dependence of elliptic flow for charged particles in Au+Au collisions using the PHOBOS detector at the Relativistic Heavy Ion Collider. Data taken at collision energies ...
    • Enhancing superconducting critical current by randomness 

      Wang, YL; Thoutam, LR; Xiao, ZL; Shen, B; Pearson, JE; Divan, R; Ocola, LE; Crabtree, GW; Kwok, WK (American Physical Society, 2016-01)
      The key ingredient of high critical currents in a type-II superconductor is defect sites that pin vortices. Contrary to earlier understanding on nanopatterned artificial pinning, here we show unequivocally the advantages ...
    • Enhancing superconducting critical current by randomness. 

      Wang, YL; Thoutam, LR; Xiao, ZL; Shen, B; Pearson, JE; Divan, R; Ocola, LE; Crabtree, GW; Kwok, WK (Physical Review B, 2016-01)
      The key ingredient of high critical currents in a type-II superconductor is defect sites that pin vortices. Contrary to earlier understanding on nanopatterned artificial pinning, here we show unequivocally the advantages ...
    • Enhancing the critical current of a superconducting film in a wide range of magnetic fields with a conformal array of nanoscale holes 

      Wang, Y. L.; Latimer, M. L.; Xiao, Z. L.; Divan, R.; Ocola, L. E.; Crabtree, G. W.; Kwok, W. K. (American Physical Society, 2013-06)
      The maximum current (critical current) a type-II superconductor can transmit without energy loss is limited by the motion of the quantized magnetic flux penetrating into a superconductor. Introducing nanoscale holes into ...
    • Erbium(III) Coordination at the Surface of an Aqueous Electrolyte 

      Bera, MK; Luo, G.; Schlossman, ML; Soderholm, L.; Lee, S.; Antonio, MR (American Chemical Society, 2015)
      Grazing-incidence (GI) X-ray absorption spectroscopy (XAS) under conditions of total external reflection is used to explore the coordination environment of the trivalent erbium ion, Er3+, at an electrolyte-vapor interface. ...