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  • Resultat 391-400 av 599
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391.
  • Hwang, Choongyu, et al. (författare)
  • Ytterbium-driven strong enhancement of electron-phonon coupling in graphene
  • 2014
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 90:11, s. 115417-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a high-resolution angle-resolved photoemission spectroscopy study in conjunction with first-principles calculations to investigate how the interaction of electrons with phonons in graphene is modified by the presence of Yb. We find that the charges transferred from Yb to the graphene layer hybridize with the graphene pi bands, leading to a strong enhancement of the electron-phonon interaction. Specifically, the electron-phonon coupling constant is increased by as much as a factor of 10 upon the introduction of Yb with respect to as-grown graphene (<= 0.05). The observed coupling constant constitutes the highest value ever measured for graphene and suggests that the hybridization between graphene and the adatoms might be a critical parameter in realizing superconducting graphene.
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392.
  • Innovation, Agglomeration and Regional Competition
  • 2009
  • Samlingsverk (redaktörskap) (refereegranskat)abstract
    • 'The rise of globalization has triggered a fundamental rethinking about the role of regions in economic development policy. In this important new book, Karlsson, Johansson and Stough assemble a cast of leading international scholars to unravel the new role for regions and local economic development policy to harness the possibilities unleashed by the forces of globalization. This book contains important new insights and ideas that will be welcomed by both scholars and policymakers.
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393.
  • Isaev, Eyvaz, et al. (författare)
  • Intrinsic defects and transition metal impurities in GaAs
  • 2004
  • Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 272:3, s. 1961-1962
  • Tidskriftsartikel (refereegranskat)abstract
    • Thermodynamics of intrinsic point defects, 3d-transition metal (TM) impurities, and various defect pairs in GaAs have been studied by means of the locally self-consistent Green's function method. Antisite defects, As-Ga, are found to be the most energetically favorable defects in the As-rich GaAs. The studied TM impurities (V, Cr, Mn, and Fe) are found to form substitutional alloys on the Ga sublattice. The magnetic moments of TM impurities in the GaAs host are calculated under the assumption that orbital moments of TM are quenched and the total magnetization is due to spill ordering of electrons in the crystal. Thermodynamic possibility of formation of complexes between TM-atoms is investigated.
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394.
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395.
  • James, P, et al. (författare)
  • Calculated trends of the magnetostriction coefficient of 3d alloys from first principles
  • 2000
  • Ingår i: APPLIED PHYSICS LETTERS. - : AMER INST PHYSICS. - 0003-6951. ; 76:7, s. 915-917
  • Tidskriftsartikel (refereegranskat)abstract
    • The general behavior of the magnetostriction coefficients for Fe, Co, and Ni and their alloys is reproduced by first-principles theory. It is shown that the low magnetostriction coefficient of soft magnetic materials, observed for specific alloy concentra
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396.
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398.
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399.
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400.
  • Johansson, Börje, et al. (författare)
  • Chemical composition-elastic property maps of austenitic stainless steels
  • 2003
  • Ingår i: Solid State Sciences. - 1293-2558 .- 1873-3085. ; 5:6, s. 931-936
  • Tidskriftsartikel (refereegranskat)abstract
    • Despite a tremendous development during the last decades, both as regards computer power and methodology, it has remained impossible to treat steel at a fundamental atomic level. However, recently we have shown [L. Vitos, P.A. Korzhavyi, B. Johansson, Phys. Rev. Lett. 88 (2002) 155501] that the most efficient theories of random substitutional alloys combined with advanced numerical techniques have made possible to establish a theoretical insight to the electronic structure of stainless steels. Here a detailed description of the quantum-mechanical modeling of austenitic stainless steels is presented. We adopt an ab initio electronic structure calculation method based on the coherent potential approximation, implemented within the framework of the exact muffin tin orbitals theory, to map the chemical composition distributions of austenitic stainless steels into the elastic property distributions. The so generated database can be fruitfully used in the design of new class of steel alloys.
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  • Resultat 391-400 av 599
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Johansson, Börje (576)Ta bort avgränsningen
Vitos, Levente (180)
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