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  • Conference proceedings  (31)
  • bioavailability
  • Springer  (32)
  • International Union of Crystallography
  • 2005-2009
  • 1995-1999  (32)
  • 1980-1984
  • 1965-1969
  • 1995  (32)
Collection
Keywords
Publisher
  • Springer  (32)
  • International Union of Crystallography
Years
  • 2005-2009
  • 1995-1999  (32)
  • 1980-1984
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Stark ladders in piezoelectric superlattices (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1775-1779 
    Details
    ISSN: 0392-6737
    Keywords: Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) ; Dielectric, piezoelectric, and ferroelectric materials ; Electrooptical effects ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We describe an experimental and theoretical investigation of Wannier-Stark ladders in the optical spectra of (111)B InGaAs/GaAs piezoelectric superlattices. A unique feature of these structures is that an external electric field can be used to produce a flat superlattice—that is zero overall potential drop per period—in which there are large, opposing fields in the well and barrier. These fields cause a spatial separation of the electron and hole wave functions in the axial direction, leading to Stark ladderss which are intermediate between Type I (electrons and holes together) and Type II (electrons and holes separated by half a period) in character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457279
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  • 2
    Electronic Resource
    Electronic Resource
    New hexagonal structures for two-dimensional photonic band gap materials (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1401-1405 
    Details
    ISSN: 0392-6737
    Keywords: Electromagnetic wave propagation ; radiowave propagation ; Developments in band-structure calculation techniques ; Other topics in optical properties of condensed matter and other interactions of matter with particles and radiations ; Other topics in electromagnetic technology ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Recently, periodic dielectric structures have been proposed to inhibit spontaneous emission in semiconductors. From this suggestion, the new concepts of photonic band gap and photonic crystal have been developed. Zero-threshold lasers, wave guides and polarizers are promising applications. A new class of twodimensional periodic structures with hexagonal symmetry is investigated in order to obtain photonic band gap materials. This set has the hexagonal symmetry and contains, in particular, several structures previously discussed. The photonic band gap structure is related to the basic properties of the materials and some features of the opening of the gaps are explained. By varying the crystal pattern, we show how band gaps common toE andH polarizations appear for a new design of two-dimensional periodic dielectric structures. The dependence of the widths of these gaps on the filling patterns is studied and potential application for the creation of photonic crystals in the optical domain is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457217
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  • 3
    Electronic Resource
    Electronic Resource
    Interparticle interaction in spin-aligned and spin-degenerate exciton systems in II–VI quantum wells (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1543-1547 
    Details
    ISSN: 0392-6737
    Keywords: Studies of specific magnetic materials ; Optical properties of thin films surfaces and layer structures (superlattices, heterojunctions and multilayers) ; Excitons and related phenomena (including electron-hole drops) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Two qualitatively different e-h systems have been investigated in undoped CdTe/Cd0.88Mn0.12Te and Cd0.97Mn0.03 Te/Cd0.75Mn0.25 Te QWs at 2 K and magnetic fields up to 14 T, namely a strongly spin-depolarized system in the CdTe QW and a highly spin-polarized one in the Cd0.97Mn0.03 Te QW. The interaction of the spin-aligned excitons is repulsive. In contrast, in the spectra of a dense spin-depolarized excitonic system an additional well pronounced emission lineM was observed at approximately 5 meV below the excitonic line. This line is assigned to the emission of molecules consisting of excitons with opposite spins of both electrons and holes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457241
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic-field-induced dissociation of bound excitons in semi-magnetic semiconductor quantum wells (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1549-1553 
    Details
    ISSN: 0392-6737
    Keywords: Studies of specific magnetic materials ; Excitons and related phenomena (including electron-hole drops) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The influence of the electron spin splitting on the stability of quasi-two-dimensional donor bound excitons (D 0 X) has been investigated in the Cd0.97Mn0.03Te/Cd0.7Mg0.3Te semi-magnetic semiconductor quantum well (QW) structure. TheD 0 X binding energy has been measured directly from emission spectra recorded at magnetic field parallel to the QW plane. Complexes have been shown to dissociate into a neutral donor and a free exciton with a spin flip of the electron at high magnetic fields when the electron spin splitting exceeds the binding energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457242
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  • 5
    Electronic Resource
    Electronic Resource
    Coherent exciton-photon dynamics in single, double, and quintuple quantum wells (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1769-1774 
    Details
    ISSN: 0392-6737
    Keywords: Optical transient phenomena (including quantum beats, dephasings and revivals, photon echoes, free induction decay, and optical nutation) ; Excitons and related phenomena (including electron-hole drops) ; Electron states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) ; Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have studied experimentally the coherent exciton-photon dynamics in a single, a double, and a quintuple quantum well structure under resonant excitation. In pump and probe experiments we observe an initial fast decay of the exciton population. This initial decay depends on the number of quantum wells. The population decay is accompanied by a coherent light emission induced by the first-order polarization, the intensity of which increases quadratically with the quantum well number. Interference effects and electromagnetic coupling effects between polarizations located in distinct quantum wells probably play a crucial role in the superlinear coherent emission process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457278
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  • 6
    Electronic Resource
    Electronic Resource
    Stochastic resonance in perspective (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 661-683 
    Details
    ISSN: 0392-6737
    Keywords: General, theoretical, and mathematical biophysics (including logic of biosystems, quantum biology and relevant aspects of thermodynamics, information theory, cybernetics and bionics) ; Fluctuation phenomena, random processes, and Brownian motion ; Probability theory, stochastic processes, and statistics ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We outline the historical development of stochastic resonance (SR), a phenomenon in which the signal and/or the signal-to-noise ratio in a nonlinear system increase with increasing intensity of noise. We discuss basic theoretical ideas explaining and describing SR, and we review some revealing experimental data that place SR within the wider context of statistical physics. We emphasize the close relationship of SR to some effects that are well known in condensed-matter physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451825
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  • 7
    Electronic Resource
    Electronic Resource
    Quasi-monochromatic noise in bistable systems: The nature of large occasional fluctuations (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 755-764 
    Details
    ISSN: 0392-6737
    Keywords: Chemical kinetics ; Fluctuation phenomena, random processes, and Brownian motion ; Probability theory, stochastic processes, and statistics ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The response of an overdamped system to quasi-monochromatic (high-frequency narrow band) noise (QMN) has been investigated by means of analogue electronic experiments. Measurements of the stationary and prehistory probability distributions demonstrate that large occasional, fluctuations are markedly different in character from those that occur when the system is driven by white or exponentially correlated noise. In particular, we report the first experimental observation of a switching point, a critical value of the coordinatex that separates regions which, with an overwhelming probability, are accessed by the fluctuating system along topologically different paths. The results are discussed in terms of, and shown to be consistent with, an existing theoretical description of the QMN-driven system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451832
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  • 8
    Electronic Resource
    Electronic Resource
    Experimental evidence of the exciton centre-of-mass quantization in Zn1−x Cd x Se/ZnSe multiple quantum wells (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1473-1479 
    Details
    ISSN: 0392-6737
    Keywords: Surface and interface electron states ; Excitons and related phenomena (including electron-hole drops) ; Polaritons (including photon-phonon and photon-magnon interactions) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We report the evidence of exciton-polariton centre-of-mass quantization in II–VI quantum wells consisting of ternary alloy. Absorption and photoluminescence studies on Zn0.89Cd0.11Se/ZnSe quantum wells, covering the intermediate region between two- and three-dimensional exciton behaviour, exhibit distinct optical resonances in the high-energy tail of the free-exciton structure. We reproduce the well width dependence of the centre-of-mass states by modeling the optical response of the QWs with a thin-slab variational wave function, which takes into account non-adiabatic terms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457229
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  • 9
    Electronic Resource
    Electronic Resource
    Modulation spectroscopy study of an InGaAs/GaAs-strained asymmetric triangular quantum well heterostructure (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1499-1503 
    Details
    ISSN: 0392-6737
    Keywords: 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 have studied modulation spectra related to the intersubband transitions at 300 K and 20 K from an In GaAs/GaAs-strained asymmetric triangular quantum well (ATQW) heterostructures fabricated by molecular beam epitaxy using the digital alloy compositional grading (DACG) method. A careful analysis of the spectra has led to the identification of various excitonic transitions,mnh(1), between them-th conduction band state to then-th, heavy (light)-hole band state. Comparison of the observed intersubband transitions with a theoretical calculation based on the envelope, function model, including the effects of strain provided a self-consistent verification that the DACG method produced the intended ATQW composition profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457233
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  • 10
    Electronic Resource
    Electronic Resource
    Fluctuations, stochastic resonance and noise-protected heterodyning in bistable optical systems (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 743-754 
    Details
    ISSN: 0392-6737
    Keywords: Optical bistability, multistability, and switching ; optical computers ; Fluctuation phenomena, random processes and Brownian motion ; Optical resonantors ; Probability theory, stochastic processes and statistics ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Statistical distributions, power spectra and susceptibilities of an all-optical bistable system subject to noise are considered. In the presence of an additional small periodic signal, a stochastic-resonance phenomenon for additive noise is found to occur, and has been investigated theoretically and experimentally. A new form of optical heterodyning related to stochastic resonance, in which two high-frequency signals (an input signal and a reference one) are applied to an all-optical bistable system, is reported. A noise-induced enhancement of the heterodyne signal has been investigated theoretically, by means of analogue electronic simulation and in experiments in which a optical system was driven by two modulated laser beams at different wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451831
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