Abstract
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 of two quantum Hall liquids at filling factors and in which both the fractional filling and the coupling strength can be finely and independently tuned. A peculiar crossover from insulating to conducting behavior as goes from to 1 is observed. These results highlight the key role played on interedge tunneling by local charge depletion at the point contact.
- Received 24 December 2008
DOI:https://doi.org/10.1103/PhysRevLett.103.016802
©2009 American Physical Society
Viewpoint
Quasiparticle doppelgängers
Published 29 June 2009
By exploiting the concept of particle-hole duality, one can realize a point junction between integer and fractional quantum Hall phases, which constitutes a crucial building block towards possible applications of the quantum Hall effect.
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