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  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear anomalies of conducting media with conical microconstrictions (1999)
    Springer
    Technical physics letters 25 (1999), S. 142-144 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An investigation is made of the divergence of the higher moments of the field in conducting structures with conical singular regions. Calculations are made of the critical values of the parameters which determine the nonlinear anomalies of a medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262380
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  • 2
    Electronic Resource
    Electronic Resource
    Anomalous behavior of textures in a magnetic field (1997)
    Springer
    JETP letters 66 (1997), S. 126-130 
    Details
    ISSN: 1090-6487
    Keywords: 68.55.Jk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that a qualitatively new type of transition to a nonlinear phase is possible in two-dimensional two-phase textures in a magnetic field. The anomalous growth of the effective response (higher-order correlation functions of the current) near the critical magnetic field is studied. The dependence of the critical magnetic field on the angles of microinclusions is calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567472
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  • 3
    Electronic Resource
    Electronic Resource
    Fano resonances and electron localization in heterobarriers (2000)
    Springer
    Journal of experimental and theoretical physics 91 (2000), S. 361-368 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study is made of electron tunneling in semiconductor heterostructures having a complex dispersion law. A generalized Fabry-Perot approach is used to describe tunneling across the barrier. Mixing of electron states at the heterojunctions is responsible for the asymmetric resonant structure of the transmission which is characterized by a resonance-antiresonance pair. The resonance corresponds to a pole while the antiresonance corresponds to a zero of the scattering amplitude in the complex energy plane, i.e., near the pole and the zero the transmission of the heterobarrier has a Fano resonance structure. It is shown that for certain barrier parameters the resonances may collapse and localized states may appear in the heterobarrier, which is observed on the current-voltage characteristics of the barriers. The two-valley model of a GaAs/AlxGa1−x As/GaAs heterostructure is considered as an example. An analysis is made of the resonance structure in the barrier as a function of the type of boundary conditions used for the heterojunctions. The low-temperature current-voltage characteristic of the barrier is calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1311996
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear percolation near a metal-insulator transition in regular textures (1997)
    Springer
    JETP letters 65 (1997), S. 544-548 
    Details
    ISSN: 1090-6487
    Keywords: 71.30.+h ; 74.25.Fy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Current percolation in weakly nonlinear two-dimensional periodic structures near a metal-insulator transition is studied. It is shown that the nonlinear conductivity exhibits critical behavior as a function of the density of the insulating and superconducting inclusions. The possibility of experimentally observing the effects predicted is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567443
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  • 5
    Electronic Resource
    Electronic Resource
    Breakdown of the linear current flow regime in periodic structures (1996)
    Springer
    JETP letters 64 (1996), S. 538-543 
    Details
    ISSN: 1090-6487
    Keywords: 72.10.Bg ; 68.55.Jk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the linear current flow regime in two-dimensional, two-component textures is unstable for some critical values of the ratio of the linear conductivities of the components. The critical current and critical field are studied as functions of the parameters of the system. The possibility of observing the predicted effect experimentally is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567231
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  • 6
    Electronic Resource
    Electronic Resource
    Breakdown of the linear current regime in periodic structures (1997)
    Springer
    Journal of experimental and theoretical physics 85 (1997), S. 351-359 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the effect of a weak nonlinearity in media on the linear regime of current flow in two-dimensional periodic structures with two equal component concentrations. We find that the asymptotic behavior of the electric field and current as functions of the distance between the angles in heterogeneous media is determined by the parameter h=σ 2/σ 1 (here σ 1 and σ 2 are the linear conductivities of the cells) and the external magnetic field B. This dependence leads to divergence of the higher-order moments of field and current at certain critical values h c and B c and to divergence of the response functions related to the higher-order moments. For square cells the effective nonlinear conductivity diverges at h⩽h c, with $$h_c = (\sqrt 2 - 1)^2 $$ . For structures of general shape we find the dependence of h c on the angles and the external magnetic field. We show that for a given structure the linear regime of current flow in the system can be reversibly transformed into a nonlinear one by varying the magnetic field strength. The critical field B c is approximately determined from the condition ω c τ∼1, where ω c and τ −1 are, respectively, the cyclotron frequency and the collision rate. Finally, we discuss the feasibility of detecting these effects experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558291
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal stabilization of anomalies in inhomogeneous conducting structures (1999)
    Springer
    Journal of experimental and theoretical physics 88 (1999), S. 997-1004 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the thermal mechanism of suppression of the anomalies in the nonlinear characteristics of inhomogeneous media. A generalized expression for the effective nonlinear conductivity is derived that allows for heat transfer from hot regions. We study the nature of the divergences in two-and three-dimensional inhomogeneous structures as depending on the local parameters and the microgeometry of the system. Finally, we show that in the critical region the effective nonlinear conductivity may be much higher than the conductivity of the components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558882
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  • 8
    Electronic Resource
    Electronic Resource
    Collapse of resonance in quasi-one-dimensional quantum channels (1999)
    Springer
    Journal of experimental and theoretical physics 89 (1999), S. 144-150 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the resonance structure of the conductance (transmissivity) of a quasi-one-dimensional channel that contains an attractive impurity of finite dimensions and derive an exact expression for the scattering matrix. We show that an impurity of finite dimensions may cause a set of Fano resonances to appear in the transmissivity. We also find that due to the coherent interaction the Fano resonances can collapse and discrete levels may appear in the continuum. Finally, we establish the wave function of the discrete levels and study the channel transmissivity in the critical regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558969
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  • 9
    Electronic Resource
    Electronic Resource
    Tunneling through discrete levels in the continuum (1999)
    Springer
    Journal of experimental and theoretical physics 88 (1999), S. 118-127 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the ballistic transport in quantum channels containing attractive impurities. We show that coherent interaction between asymptotic resonances may cause resonances to disappear and discrete levels to appear in the continuum at certain (critical) values of the parameters of the system. For the first time the tunneling of an electron through discrete levels is investigated. We find that the transmissivity changes dramatically when the scattered electrons at infinity have an energy coinciding with that of the discrete levels. It is found that a new type of degeneracy may arise in the system at critical values of the parameters, a degeneracy in which one state is described by a localized wave function and the other, by a propagating wave function. We calculate the critical values of the parameters of the structure and discuss ways of experimentally implementing this effect in two-dimensional channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558773
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  • 10
    Electronic Resource
    Electronic Resource
    The generation of the third harmonic in highly anisotropic media near the percolation threshold (2000)
    Springer
    Technical physics 45 (2000), S. 194-198 
    Details
    ISSN: 1090-6525
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The amplitude of the third harmonic in highly anisotropic media was calculated with a percolation model. Inclusion-shape and local-conductivity anisotropies were considered. Associated critical indexes and crossover values were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1259596
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