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An explanation for the anomalous behavior in tunneling conductance and noise through a point contact between edge states in the Jain series, for weak-backscattering and low temperatures [1] will be presented. Edge states will be described in terms of charged an neutral modes propagating at finite velocity with additional coupling to external baths.
The changes in the temperature power-law behavior of the conductance, due to these effects will be evaluated. We will demonstrate that multiple-quasiparticles tunneling at low energies becomes the most relevant process [2]. This result will be used to explain the experimental data on current noise where tunneling particles have a charge larger than the single quasiparticle charge.
[1] Y.C. Chung, M. Heiblum, and V. Umansky, Phys. Rev. Lett. 91, 216804 (2003). [2] A. Braggio, M. Merlo, N. Magnoli, M. Sassetti, arXiv:0805.3435 |
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