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NEST Scientific Report 2007-200925 Stefan Heun

Summary: NEST Scientific Report 2007-200925
Stefan Heun
Selective control of quantum Hall edge-channel trajectories by
scanning gate microscopy
lectronic Mach­Zehnder interferometers in the quantum Hall regime are currently
discussed for the realization of quantum information schemes. A recently proposed
device architecture employs interference between two co-propagating edge channels
(see the report of V. Giovannetti). Here we demonstrate the precise control of individual
edge-channel trajectories in quantum point contact devices in the quantum Hall regime.
The biased tip of an atomic force microscope is used as a moveable local gate to pilot
individual edge channels. Our results are discussed in light of the implementation of multi-
edge interferometers.
Interference phenomena are a fundamental
manifestation of the quantum mechanical
nature of electrons and have promising
applications in solid-state quantum
information technology. Two-dimensional
electron systems (2DES) in the quantum


Source: Abbondandolo, Alberto - Scuola Normale Superiore of Pisa


Collections: Mathematics