Abstract
Dario Ferraro (INFN, Genova, Italy)
Anomalous charge tunnelling in fractional quantum Hall edge states
A detailed description of tunnelling processes through a point contact for
fractional quantum Hall edges in the Jain series and for ν=5/2 will be
presented. The edge states of these FQH systems will be described in terms
of charged and neutral modes propagating with finite velocities. Possible
interaction effects due to external environment will also be properly
taken into account.
We will show that peculiar multiple-quasiparticle agglomerates dominate
the transport at low enough energy. This result crucially depends on the
presence of finite bandwidth neutral modes and is essential to fully
explain the observed anomalous behaviour of transport properties like
tunneling conductance and excess noise through a point contact [1,2]. The
thermal evolution of linear conductance and effective charge estimated
from the current noise will be presented and compared with experiments
[3,4].
[1] Y.C. Chung, M. Heiblum, V. Umansky, Phys. Rev. Lett. 91, 216804
(2003).
[2] M. Dolev, Y. Gross, Y. C. Chung, M. Heiblum, V. Umansky and D. Mahalu,
Phys. Rev. B 81, 161303 R (2010).
[3] D. Ferraro, A. Braggio, M. Merlo, N. Magnoli, M. Sassetti,
Phys. Rev. Lett. 101, 166805 (2008).
[4] M. Carrega, D. Ferraro, A. Braggio, N. Magnoli, M. Sassetti, arXiv:
1102.5666 [cond-mat] (Submitted to Phys. Rev. Lett).