Abstract
It has been shown that the observation of the transitions between the dielectric phase and the integer-quantum-Hall-effect phases with the quantized Hall conductivity σ q xy ≥ 3e 2/h announced in a number of works is unjustified. In these works, the crossing points of the magnetic-field dependence of the diagonal resistivity ρ xx at different temperatures T and ωcτ = 1 have been misidentified as the critical points of the phase transitions. In fact, these crossing points are due to the sign change of the derivative dρ xx /dT owing to the quantum corrections to the conductivity. Here, ωc = eB/m is the cyclotron frequency, τ is the transport relaxation time, and m is the effective electron mass.
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Original Russian Text © S.S. Murzin, 2010, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 91, No. 3, pp. 166–168.
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Murzin, S.S. On the phase boundaries of the integer quantum Hall effect. Part II. Jetp Lett. 91, 155–157 (2010). https://doi.org/10.1134/S0021364010030112
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DOI: https://doi.org/10.1134/S0021364010030112