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  • 1
    Electronic Resource
    Electronic Resource
    Instability of layered quantum liquids: 4. Intraplane and interplane correlations (1994)
    Springer
    The European physical journal 95 (1994), S. 341-355 
    Details
    ISSN: 1434-6036
    Keywords: 05.30.Fk ; 73.20.Mf ; 74.70.Jm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the local-field correctionsG(q, q z) f electron superlattices with interlayer distanced in order to describe many-body effects. A generalized Hubbard expression for the local-field correction is derived. The sum-rule version of the self-consistent approach for the local-field correction is developed and used to discuss the effects of exchange and correlation. The RPA-parameterr s and the ratiod/a * determine the many-body effects.a * is the effective Bohr radius. The stability region for the Fermi liquid behavior of the layered electron gas is discussed: (i) ford≫a * the critical RPA-parameterr sc≫1 is determined by exchange andintraplane correlation effects, (ii) ford≈a * withr sc≈1 correlation effects are small and the instability point is mainly determined by exchange effects, (iii) ford≪a * withr sc〈1 exchange andinterplane correlation effects are both important for the instability point. Our results are important for high-T c superconductors, organic superconductors and semiconductor superlattices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01343963
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Instability of layered quantum liquids: 5. Collective modes at low density (1995)
    Springer
    The European physical journal 97 (1995), S. 119-125 
    Details
    ISSN: 1434-6036
    Keywords: 73.20.Mf ; 74.70.Jm ; 05.30.Fk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the plasmon dispersion of electron superlattices by taking into account many-body effects via the local-field correction. For small electron density we find a weak roton structure in the dispersion of optical plasmons. Landau damping is strongly enhanced by many-body effects, especially for acoustical plasmons. We compare with experimental results of high-T c superconductors. Some experiments are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317595
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Elementary excitations in nanochannel arrays of quantum wires (1994)
    Springer
    The European physical journal 94 (1994), S. 395-399 
    Details
    ISSN: 1434-6036
    Keywords: 05.30.Fk ; 73.20.Mf ; 73.20.Dx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an analytical model for the Coulomb interaction effects in quantum wires forming a nanochannel array. We study the elementary excitations (plasmons and electron-hole excitations) of electron arrays forming three-dimensional structures. The plasmon spectrum of boson arrays is also calculated. Our model applies to bulk material with one-dimensional conduction channels as realized in organic or polymer crystals and in nanochannel array glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317401
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Instability of layered quantum liquids: 3. New phase in fermion superlattices (1994)
    Springer
    The European physical journal 94 (1994), S. 373-385 
    Details
    ISSN: 1434-6036
    Keywords: 05.30.Fk ; 73.20.Mf ; 74.70.Jm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Starting with a layered interacting Fermi liquid we describe a possible origin of high-T c superconductivity. We argue that for a electron densityN smaller than a critical densityN c many-body effects are very large in layered electron systems leading, to an attraction of electrons in neighboring planes. This attraction leads to pairing of two electrons. The paired electrons are bosons, which undergo a Bose-Einstein condensation and form a Schafroth superconductor (local pairing) with a boson densityN B expressed asT c ∝N B ∝N[1-(N/N c )1/2]. This superconductor is characterized by a short coherence length. We compare our theoretical results for the critical temperatureT c , the pressure effect coefficient α and the isotope effect coefficient β with experimental results and find good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317399
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