title: Tuning nonlinear charge transport between integer and fractional quantum Hall states.
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 nu=1 and nu*<or=1 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 interedge tunneling by local charge depletion at the point contact.
authors: NEST, Scuola Normale Superiore and CNR-INFM, Piazza dei Cavalieri 7, I-56126 Pisa, Italy.
authors: Stefano
authors: S
authors: Roddaro
authors: Nicola
authors: N
authors: Paradiso
authors: Vittorio
authors: V
authors: Pellegrini
authors: Giorgio
authors: G
authors: Biasiol
authors: Lucia
authors: L
authors: Sorba
authors: Fabio
authors: F
authors: Beltram