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  • Articles  (14)
  • 73.20.Dx  (14)
  • Springer  (14)
  • American Chemical Society
  • American Geophysical Union
  • De Gruyter
  • Nature America Inc.
  • 2000-2004  (14)
  • 1970-1974
  • 1930-1934
  • 2000  (14)
  • Physics  (14)
  • Education
  • Process Engineering, Biotechnology, Nutrition Technology
  • Energy, Environment Protection, Nuclear Power Engineering
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  • Articles  (14)
Source
Keywords
Publisher
  • Springer  (14)
  • American Chemical Society
  • American Geophysical Union
  • De Gruyter
  • Nature America Inc.
Years
  • 2000-2004  (14)
  • 1970-1974
  • 1930-1934
Year
  • 2000  (14)
Topic
  • Physics  (14)
  • Education
  • Process Engineering, Biotechnology, Nutrition Technology
  • Energy, Environment Protection, Nuclear Power Engineering
  • 1
    Electronic Resource
    Electronic Resource
    Collective behavior of interwell excitons in GaAs/AlGaAs double quantum wells (2000)
    Springer
    JETP letters 71 (2000), S. 117-122 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Mf ; 73.20.Dx ; 78.55.Cr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoluminescence spectra of interwell excitons in double GaAs/AlGaAs quantum wells (n-i-n structures) have been investigated (an interwell exciton in these systems is an electron-hole pair spatially separated by a narrow AlAs barrier). Under resonance excitation by circularly polarized light, the luminescence line of interwell excitons exhibits a significant narrowing and a drastic increase in the degree of circular polarization of photoluminescence with increasing exciton concentration. It is found that the radiative recombination rate significantly increases under these conditions. This phenomenon is observed at temperatures lower than the critical point and can be interpreted in terms of the collective behavior of interwell excitons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568294
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  • 2
    Electronic Resource
    Electronic Resource
    Charge oscillations in a double quantum dot in the Coulomb blockade regime (2000)
    Springer
    JETP letters 71 (2000), S. 391-394 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 03.65.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The two-electron dynamics in a symmetric double quantum dot placed in a onstant electric field is considered. It is shown that, despite the Coulomb blockade, interdot electron-density oscillations are possible. In these oscillations, a charge equal to the charge of a single electron is periodically transferred from one quantum dot to the other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568362
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  • 3
    Electronic Resource
    Electronic Resource
    Screening of excitonic states by low-density 2D charge carriers in GaAs/AlGaAs quantum wells (2000)
    Springer
    JETP letters 72 (2000), S. 324-328 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 71.35.Cc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Screening of excitonic states by a system of 2D electrons (or holes) in GaAs/AlGaAs single quantum wells is studied. With increasing concentration of 2D charge carriers, a threshold-type disappearance of excitonic states is observed in both luminescence and reflectance spectra. The higher the quality of the 2D system, the lower the corresponding threshold concentration. In the best systems, the collapse of excitonic states occurs at unexpectedly low electron densities n e =5×109 cm−2, which correspond to the mean dimensionless distance between the particles r s =8. This value far exceeds the threshold values observed for 3D systems (r s ≈2), as well as the values obtained for quantum wells in previous studies. The problem of measuring the concentration of low-density 2D charge carriers in photoexcitation conditions is solved by applying the method of optical detection of the dimensional magnetoplasma resonance. This method provides reliable measurements of the density of a 2D system to the values about 109 cm−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1328448
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  • 4
    Electronic Resource
    Electronic Resource
    Orientational pinning of the striped phase in a quantum Hall liquid (2000)
    Springer
    JETP letters 71 (2000), S. 422-425 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 73.40.Hm ; 71.45.Lr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new class of collective states, which are assumed to be due to the spontaneous formation of a charge density wave (“striped” phase) upon filling high Landau levels, was recently observed in a 2D electron system based on GaAs/AlGaAs(001). The following unsolved problem is considered in the work: what is the reason for stripe pinning along the crystallographic direction [110]? It is shown that the effective mass of 2D electrons is anisotropic for a single heterojunction (001) A 3 B 5. This natural anisotropy is due to the C 2v symmetry of the heterointerface and, even being weak (0.1%), can govern the stripe direction. A magnetic field parallel to the interface induces “magnetic” anisotropy of effective mass. The competition of these two types of anisotropy (natural and magnetic) provides a quantitative description of the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568368
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  • 5
    Electronic Resource
    Electronic Resource
    Current response of a superlattice irradiated with nonequilibrium phonons (2000)
    Springer
    JETP letters 71 (2000), S. 191-194 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 73.50.−h; 73.61.−r
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We studied a biased superlattice and revealed a considerable current response to irradiation by non-equilibrium acoustic phonons with an effective temperature on the order of a few Kelvins. We discuss two phonon source-superlattice configurations, for which the current response is caused by either interwell or intrawell electron transitions. We have shown that the response is sensitive to both direction and spectral distribution of phonons. The results explain recent experiments on the phonon-induced current response and prove that the superlattices can be used for the characterization of a high-frequency phonon flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568312
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  • 6
    Electronic Resource
    Electronic Resource
    Bistable charge states in a photoexcited quasi-two-dimensional electron-hole system (2000)
    Springer
    JETP letters 71 (2000), S. 322-326 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 33.50.Dq ; 78.66.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The luminescence spectra of GaAs/AlGaAs quantum wells (QWs) with low-density quasi-two-dimensional electron and hole channels were studied. It was demonstrated that, at temperatures below some critical value (T c ∼30 K) and for an excitation power lying in a certain temperature-dependent range, two metastable charge states with two-dimensional charge densities differing in both magnitude and sign can occur in the system under the same conditions. The obtained experimental data agree well with the mathematical model allowing for the transfer of photoexcited carriers to the barrier followed by their tunneling into QW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568342
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  • 7
    Electronic Resource
    Electronic Resource
    Exciton luminescence of quasi-two-dimensional solid solutions (2000)
    Springer
    JETP letters 71 (2000), S. 242-245 
    Details
    ISSN: 1090-6487
    Keywords: 71.55.Jv ; 73.20.Dx ; 78.66.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Absorption and luminescence of the quantum wells formed by the (Zn-Cd)Se and (Ga-In)As solid solutions are studied in the range of exciton size-quantization ground state. The spectra observed are described by a model assuming the two-dimensional character of fluctuation states in quantum wells and the presence of a percolation threshold within the absorption contour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568325
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  • 8
    Electronic Resource
    Electronic Resource
    Anomalous fluctuations of 2D-electron recombination radiation intensity in the quantum Hall regime (2000)
    Springer
    JETP letters 71 (2000), S. 383-386 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 73.40.Hm ; 78.66.−w ; 05.40.−a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Anomalous intensity fluctuations are observed in the spectrum of radiative ecombination of quasi-two-dimensional (2D) electrons with photoexcited holes in a single quantum well. The fluctuations are observed exclusively under the conditions of the quantum Hall effect (QHE). It is shown that, if the QHE conditions are not fulfilled, the radiation intensity fluctuates strictly following the Poisson distribution 〈δN 2〉/〈N〉= 1), whereas in the QHE regime the fluctuation amplitude increases by several orders of magnitude (〈δ N 2〉/〈N〉∼102). It is demonstrated that the maxima of the emission noise amplitude coincide with the maxima of inverse magnetoresistance of 2D electrons in the QHE regime and correspond to establishing an anomalously high uniformity of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568360
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  • 9
    Electronic Resource
    Electronic Resource
    Dimensional magnetoplasma resonance of 2D holes in (001) GaAs/AlGaAs quantum wells (2000)
    Springer
    JETP letters 72 (2000), S. 460-463 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 73.50.Mx ; 76.70.Hb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dimensional magnetoplasma resonance is observed and studied in a spatially confined, two-dimensional hole system in (001) GaAs/AlGaAs single quantum wells. From the analysis of the field dependence of the magnetoplasma resonance on the diameter of the 2D system, the semiclassical cyclotron hole mass is determined. Its value is found to be equal to 0.26m 0 (m 0 is the free electron mass), which considerably exceeds the theoretically predicted value. A method is proposed for a direct determination of the concentration and mobility of 2D holes from the analysis of the magnetoplasma resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1339900
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  • 10
    Electronic Resource
    Electronic Resource
    Nonohmic Coulomb drag in the ballistic electron transport regime (2000)
    Springer
    JETP letters 71 (2000), S. 111-113 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 73.61.−r
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We developed the theory of Coulomb drag current induced in a one-dimensional nanowire by the ballistic nonohmic current in a nearby parallel nanowire under the ballistic transport regime. As in the ohmic case, we predict sharp oscillations of the drag current as a function of gate voltage or chemical potential of electrons. We also study the dependence of drag current on the voltage V across the driving wire. For relatively large values of V, the drag current is proportional to V 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568292
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