2003/09/30 by Adeline Crépieux, A. Crepieux, P. Devillard +2 · 1 citation
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.69.205302
published as Phys. Rev. B 69, 205302 (2004) · 14 pages, 6 figures
arxiv created 2003/12/08 · openalex publication_date 2004/05/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The effect of an ac perturbation on the shot noise of a fractional quantum Hall fluid is studied both in the weak and the strong backscattering regimes. It is known that the zero-frequency current is linear in the bias voltage, while the noise derivative exhibits steps as a function of bias. In contrast, at Laughlin fractions, the backscattering current and the backscattering noise both exhibit evenly spaced singularities, which are reminiscent of the tunneling density-of-states singularities for quasiparticles. The spacing is determined by the quasiparticle charge \ensuremathνe and the ratio of the dc bias with respect to the drive frequency. Photoassisted transport can thus be considered as a probe for effective charges at such filling factors, and could be used in the study of more complicated fractions of the Hall effect. A nonperturbative method for studying photoassisted transport at \ensuremathν=1/2 is developed, using a refermionization procedure.