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  • Electronic Resource  (6)
  • 05.30.Fk  (4)
  • 73.50.−h  (1)
  • Analytical Chemistry and Spectroscopy  (1)
  • 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
    The conductivity of the spin-polarized two-dimensional electron gas: Exchange/correlation and strong disorder effects (2000)
    Springer
    JETP letters 72 (2000), S. 274-277 
    Details
    ISSN: 1090-6487
    Keywords: 73.50.−h ; 71.30.+h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The conductivity of a spin-polarized two-dimensional electron gas is calculated and compared with the conductivity of the unpolarized electron gas. Disorder effects are considered within the self-consistent current relaxation theory, which gives rise to a crossover point from metallic to insulating behavior. Many-body effects due to exchange and correlation are taken into account and are described by a local-field correction. Our calculations are in good agreement with recent experimental results on the magnetoresistance of silicon inversion layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1324027
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of cyclopentafused isomers of benz(a)anthracene in wood smoke (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1987), S. 369-374 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A previously-unidentified peak occurring in chromatograms of the polycyclic aromatic hydrocarbon fraction from wood smoke particulate extracts analysed by capillary gas chromatography on a DB-5 column was found to correspond in retention index and molecular mass either to benzo(a)fluoranthene or to benzo(1)aceanthrylene, one of a series of four novel and highly mutagenic cyclopentafused isomers of benz(a)anthracene. Detailed sub-fractionation, and re-analysis on a liquid crystal capillary column, indicated that the identity of this peak was most likely to be benzo(a)fluoranthene, a compound not previously reported in woodsmoke.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200140804
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    Paper (German National Licenses)
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