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(*)< 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
Tuning nonlinear charge transport between integer and fractional Quantum Hall states
BELTRAM, Fabio
2009
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(*)< 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 contactI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
