Tuning non-linear charge transport between integer and fractional quantum Hall states

Details Tuning non-linear charge transport between integer and fractional quantum Hall states Tuning non-linear charge transport between integer and fractional quantum Hall states

2009-03-24

arxiv.org/abs/0903.4085v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, suppl.mat

Scientific paper

Controllable point junctions between different quantum Hall phases are a necessary building block for the development of mesoscopic circuits based on fractionally-charged quasiparticles. We demonstrate how particle-hole duality can be exploited to realize such point-contact junctions. We show an implementation for the case filling factors $\nu=1$ and $\nu^*\le1$ in which both the fractional filling $\nu^*$ and the coupling strength can be finely and independently tuned. A peculiar crossover from insulating to conducting behavior as $\nu^*$ goes from 1/3 to 1 is observed. These results highlight the key role played on inter-edge tunneling by local charge depletion at the point contact.

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