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  • 1
    Electronic Resource
    Electronic Resource
    Manifestation of exitonic effects in the magneto-oscillations of the intensity of the recombination radiation of 2D electrons (1996)
    Springer
    JETP letters 64 (1996), S. 774-779 
    Details
    ISSN: 1090-6487
    Keywords: 78.66.Fd ; 78.60.−b ; 76.40.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study is made of the temperature dependence of the magnetooscillations of the recombination radiation of 2D electrons from the photoexcited size-quantization subband in an isolated GaAs/AlGaAs quantum well. It is shown that at high temperatures (T〉10 K) the period of the oscillations is determined by the ratio of the intersubband energy splitting and the sum of the electron and hole cyclotron energies. It is found that as the temperature decreases (T〈5 K), a new series of oscillations (with the same period but with a larger phase shift), which are associated with the appearance of excitonic states under the Landau levels, appears.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567296
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  • 2
    Electronic Resource
    Electronic Resource
    Charged and neutral excitonic complexes in GaAs/AlGaAs quantum wells (1997)
    Springer
    JETP letters 66 (1997), S. 766-772 
    Details
    ISSN: 1090-6487
    Keywords: 71.35.Cc ; 78.66.Fd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature and magnetic-field dependences of the recombination line of multiparticle excitonic complexes in undoped and lightly doped GaAs/AlGaAs quantum wells are investigated. These dependences have previously been attributed to free charged excitons (trions). It is shown that this line corresponds to a bound state of a complex, specifically, to an exciton bound on a neutral donor in a barrier. It is found that as the temperature or pump power is raised, there appear in the recombination spectrum not only a cyclotron replica shifted downward in energy but also a replica which is symmetrically shifted upwards in energy by an amount equal to the cyclotron energy and which is due to emission from an excited state of an impurity complex. The behavior of the cyclotron replicas is studied as a function of the electron density and temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567595
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetoplasmon replica in the recombination radiation spectra of a quasi-two-dimensional electron gas in GaAs/AlGaAs quantum wells (1997)
    Springer
    JETP letters 66 (1997), S. 575-580 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 73.20.Mf ; 78.60.−b ; 78.55.Cr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The radiative recombination spectra of two-dimensional electrons with free photoexcited holes are investigated for a wide variety of GaAs/ AlGaAs quantum wells, with different thicknesses and electron densities. It is found that for certain, close to integral, filling factors an intense line corresponding to an Auger process — radiative recombination with the emission of an additional magnetoplasmon — appears in the luminescence spectrum. The new line is shifted to lower energies with respect to the zero Landau level, and the magnetic field dependence of the energy splitting between these lines agrees with the theoretical concepts of the dispersion of magnetoplasmon excitations. This makes it possible to estimate the magnetoplasmon energy at the roton minimum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567548
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  • 4
    Electronic Resource
    Electronic Resource
    Localization of negatively charged excitons in GaAs/AlGaAs quantum wells (1999)
    Springer
    JETP letters 70 (1999), S. 595-601 
    Details
    ISSN: 1090-6487
    Keywords: 78.66.Fd ; 71.35.Aa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The localization of negatively charged excitons on isolated charged donors, located in a barrier at various fixed distances L from the heteroboundary, is investigated in isolated GaAs/AlGaAs quantum wells. The energy shift of the cyclotron replica in the emission spectra of a localized excitonic complex is studied as a function of L. It is shown that in undoped samples charged excitons localize on residual donors at distances L〉350 Å on account of the formation of D − complexes at shorter distances. It is established that a cyclotron replica arises with the recombination of an excited state and not the ground state, as previously thought, of an excitonic complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568221
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Self-consistent calculation of Landau levels of a quasi-two-dimensional hole gas at a GaAs/AlGaAs p-type heterojunction (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1019-1027 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An efficient method is proposed for the self-consistent calculation of Landau levels of a quasi-two-dimensional hole gas at a GaAs/AlGaAs heterostructure in a perpendicular magnetic field. The method is based on transforming the Schroedinger and Poisson equations to a system of nonlinear differential equations which are then spatially discretized and solved by the method of relaxation. The method proposed is used to model the optical spectra for recombination of the quasi-two-dimensional hole gas with electrons localized at a dlayer of donors in an isolated p-type heterojunction. Particular attention is paid to effects associated with the dependence of the wave functions and shape of the potential well on the magnetic field, which have not been considered before.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130479
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  • 7
    Electronic Resource
    Electronic Resource
    Excitonic effects in the recombination radiation spectra of completely filled Landau levels of two-dimensional electrons (1997)
    Springer
    JETP letters 65 (1997), S. 38-44 
    Details
    ISSN: 1090-6487
    Keywords: 78.66.Fd ; 73.50.Gr ; 78.60.Ya ; 71.70.Di
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The recombination radiation spectra of two-dimensional electrons in an asymmetrically doped GaAs/AlGaAs quantum well are investigated at different temperatures and laser-excitation energies. At low temperatures and in high magnetic fields the recombination lines of the electrons from completely filled Landau levels are split into narrow sublevels. It is shown that this fine structure of the Landau levels is due to the presence of excitonic effects in the initial and final states of the photoexcited system. It is demonstrated that the recombination process is accompanied by the excitation of intersubband and cyclotron magnetoplasma modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567317
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  • 8
    Electronic Resource
    Electronic Resource
    Free and localized positively charged excitons in the emission spectrum of GaAs/AlGaAs quantum wells (1998)
    Springer
    JETP letters 68 (1998), S. 236-242 
    Details
    ISSN: 1090-6487
    Keywords: 78.55.Cr ; 78.66.Fd ; 71.35.Ji
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The recombination emission spectra of an excitonic complex (A 0 X) localized on a neutral acceptor, which have previously been attributed to a positively charged exciton (X +), are investigated. Satellites arising around the main luminescence line as a result of recoil processes during recombination of the complex which leave the surviving hole in an excited state are observed and investigated. It is shown in a computational model based on the Luttinger Hamiltonian that the energy splittings between the main line and the satellites correspond to an in-barrier impurity center located a definite distance from the well. It is shown that as the magnetic field increases, a transition is observed from the singlet ground state of the complex to a multiplet state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567852
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  • 9
    Electronic Resource
    Electronic Resource
    Excitons and excitonic complexes in GaAs/AlGaAs quantum wells with a low-density quasi-two-dimensional electron and hole channel (1998)
    Springer
    JETP letters 67 (1998), S. 744-750 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Dx ; 71.35.Cc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The recombination spectra of excitons and excitonic complexes in un-doped GaAs/AlGaAs single quantum wells are investigated. It is shown on the basis of a study of the magnetic-field dependence of the emission spectra and the degree of optical orientation in zero magnetic field and on the basis of electrooptic measurements that not only the density but also the sign of the charge carriers in a well depend strongly on the photoexcitation energy. It is shown on the basis of a comparative analysis of the spin splitting of the recombination lines of free and bound excitons that the recombination line which was attributed earlier to a positively charged exciton corresponds to the recombination of an exciton bound on a neutral acceptor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567741
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  • 10
    Electronic Resource
    Electronic Resource
    Optical detection of the absorption of acoustical phonons by a two-dimensional electron gas in a magnetic field (1999)
    Springer
    JETP letters 69 (1999), S. 31-37 
    Details
    ISSN: 1090-6487
    Keywords: 73.20.Mf ; 73.20.Dx ; 85.30.Mn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of absorption of nonequilibrium acoustical phonons on the intensity of recombination of a two-dimensional electron gas in a magnetic field is investigated. The nonequilibrium acoustical phonons are emitted in the relaxation of electrons in a tunnel junction deposited on the back side of a sample with a two-dimensional electronic channel. It is demonstrated that the optical signal showing the intensity of the recombination of nonequilibrium electrons from a photoexcited size-quantization subband can serve as a sensitive detector of acoustical phonons. Because the general heating of two-dimensional carriers and the intersubband transitions stimulated by the absorption of nonequilibrium acoustical phonons lead to effects of different sign, the useful signal can be discriminated unambiguously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567980
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