Conductivity peaks broadening in the quantum Hall regime |
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Authors: | D G Polyakov and B I Shklovskii |
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Institution: | Theoretical Physics Institute, University of Minnesota, Minneapolis, MN55455, USA |
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Abstract: | We argue that it is the hopping transport that is responsible for broadening of the σxx peaks. Explicit expressions for the width Δν of a peak as a function of the temperature T, current J and frequency ω are found. It is shown that Δν grows with T as (T/T1)κ, where κ is the inverse localization-length exponent. The current J is shown to act like the effective temperature Teff(J) ∝ J1/2 if
. Broadening of the ohmic ac-conductivity peaks with frequency ω is found to be determined by the effective temperature |
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