Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-02-21
Physical Review B 83, 155305 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1103/PhysRevB.83.155305
We demonstrate an innovative quantum Hall circuit with variable geometry employing the moveable electrostatic potential induced by a biased atomic force microscope tip. We exploit this additional degree of freedom to identify the microscopic mechanisms that allow two co-propagating edge channels to equilibrate their charge imbalance. Experimental results are compared with tight-binding simulations based on a realistic model for the disorder potential. This work provides also an experimental realization of a beam mixer between co-propagating edge channels, a still elusive building block of a recently proposed new class of quantum interferometers.
Beltram Fabio
Biasiol Giorgio
Fazio Rosario
Giovannetti Vittorio
Heun Stefan
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