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  • 1
    Electronic Resource
    Electronic Resource
    Observation of spin and charge collective modes in one-dimensional metallic chains (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 402 (1999), S. 504-507 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The many-body theory of interacting electrons in solids establishes the existence of elementary excitations, named quasi-particles, which show a one-to-one correspondence with non-interacting electrons. But this so-called Fermi liquid approach breaks down spectacularly in one-dimensional ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/990052
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  • 2
    Electronic Resource
    Electronic Resource
    Design of a miniature picosecond low-energy electron gun for time-resolved scattering experiments (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 4404-4407 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present the design and performance tests of a miniaturized pulsed low-energy electron gun. Electrons photoemitted from a gold cathode are accelerated over a distance of 75 μm and then collimated by a microchannel plate. According to calculations, this novel concept will allow the time spread of the electron pulses to be kept below 5 ps for kinetic energies as low as 100 eV. The achievement of a minimum angular beam divergence ((approximate)1°) along with an energy resolution of 1.1 eV has to be paid for by low signal intensities. We demonstrate the performance of the gun and the high electron-beam coherence by presenting low-energy-electron diffraction images taken from a submonolayer of lead adsorbed on the germanium (111) surface. We anticipate that this electron gun will open up new possibilities for following structural changes on solid surfaces in real time. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1419219
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  • 3
    Electronic Resource
    Electronic Resource
    Photoemission study of the carrier bands in Bi(111) (2000)
    Springer
    The European physical journal 17 (2000), S. 603-608 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 79.60.-i Photoemission and photoelectron spectra - 73.20.At Surface states, band structure, electron density of states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present high-resolution photoemission data from the Bi(111)-surface. The electronic structure of the semimetal close to the Fermi level has been found to change dramatically with respect to the well established bulk band structure. The Fermi surfaces observed for the electron and hole bands resemble those of the next group-V element, antimony, probably as a consequence of surface relaxation. This results in a relatively high surface charge density. The observed temperature dependence of the electron Fermi energy confirms this result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070097
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  • 4
    Electronic Resource
    Electronic Resource
    A system with a complex phase transition: Indium chains on Si(111) (2001)
    Springer
    The European physical journal 20 (2001), S. 313-319 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.30.+h Metal-insulator transitions and other electronic transitions – 71.45.Lr Charge-density-wave systems – 79.60.-i Photoemission and photoelectron spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We examined in detail the geometric and electronic structure of thin In chains on vicinal Si(111) surfaces by means of low energy electron diffraction and ultrahigh-resolution photoemission as a function of temperature. Our data reveal a transition around T c = 115 K from a high temperature ( 4×1)- to a low temperature ( 8×2)-phase being reversible with a small hysteresis of the order 10 K. ARPES spectra exhibit clearly important concomitant changes in the electronic band structure near the Fermi surfaces and at the border of the surface Brillouin zones. We derive the dispersive behavior of the bands involved in the transition in detail and demonstrate that at least two surface state bands m2 and m3 show the opening of a pseudo energy gap on the Fermi surface leaving small but finite spectral weight in the low-temperature state. We conclude that this transition is probably driven by a similar but more complex mechanism than in a conventional Peierls transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01352592
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