Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-27
Europhysics Letters (2010) (under press)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
The form has been improved, with additional useful comments, citations have been added. 7 pages, one figure
Scientific paper
We consider a tunnel junction between two arbitrary non-linear systems in any dimension, which can be different. We show that the tunneling charge can be detected using three alternative methods based on current measurements. Besides being technically easier compared to noise measurements, these methods present valuable advantages: they do not require the knowledge of the underlying models, and some are accessible in the experimentally convenient low-voltage regime, where heating effects are reduced. The first method is based on the AC conductance, while the two others are based on photo-assisted current (PAC) and can be implemented for any time-dependence of the tunneling amplitude. These are promising for edge states in the regime of the fractional quantum Hall effect (FQHE): the Hamiltonian does not have to be specified and can incorporate non-universal interactions between the edges, and it is more convenient to use an AC gate voltage rather than an AC bias. These methods apply for instance to weak barriers in 1-D systems, Superconductor-Insulator-Normal (SIN) or graphene-like structures.
Safi Ines
Sukhorukov Eugene V.
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