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  • Conference proceedings  (2)
  • Biochemistry, Online Only  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Linear and non-linear optical properties of semiconductor superlattices: Excitonic and field-induced effects (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1693-1697 
    Details
    ISSN: 0392-6737
    Keywords: High-field and nonlinear effects ; Theory of electronic transport ; scattering mechanism ; Ultrafast optical techniques ; Optical properties of thin films, surfaces and layer structures (superlattices, heterojunctions, and multilayers) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The effective dimensionality of excitons can be drastically changed by applying an alternating electric field. On the basis of a full three-dimensional description of both coherent and incoherent phenomena in anisotropic structures it is found that appropriate applied oscillating fields change the exciton wave function from anisotropic three dimensional to basically two dimensional. This effective-dimension change is caused by dynamic localization which leads to an increase of the exciton binding energy and of the corresponding oscillator strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457265
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electric-field-induced exciton ionization in a GaAs/AlGaAs superlattice (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1759-1762 
    Details
    ISSN: 0392-6737
    Keywords: Optical transient phenomena (including quantum beats, dephasings and revivals, photon echoes, free induction decay, and optical mutation) ; Excitons and related phenomena (including electron-hole drops) ; Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter ; Optical properties of thin films, surfaces and thin layer structures (including superlattices, heterostructures, and intercalation compounds) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We study exciton ionization induced by an axial electric field in a strongly coupled GaAs/Al0.3 Ga0.7 As superlattice at low temperatures. The field-induced ionization times of the heavy-hole 1s exciton in the miniband field regime are determined from transient four-wave-mixing experiments and theoretical model calculations. They are found to lie between the field ionization times of excitons in bulk semiconductors, and in strongly confined quantum well systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457276
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    Paper (German National Licenses)
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  • 3
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    Structure, mechanism, and regulation of the chloroplast ATP synthase (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-05-11
    Description: The chloroplast adenosine triphosphate (ATP) synthase uses the electrochemical proton gradient generated by photosynthesis to produce ATP, the energy currency of all cells. Protons conducted through the membrane-embedded F o motor drive ATP synthesis in the F 1 head by rotary catalysis. We determined the high-resolution structure of the complete cF 1 F o complex by cryo–electron microscopy, resolving side chains of all 26 protein subunits, the five nucleotides in the F 1 head, and the proton pathway to and from the rotor ring. The flexible peripheral stalk redistributes differences in torsional energy across three unequal steps in the rotation cycle. Plant ATP synthase is autoinhibited by a β-hairpin redox switch in subunit that blocks rotation in the dark.
    Keywords: Biochemistry, Online Only
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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