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Quantum Interferences in the Quantum Hall Regime
A two-dimensional gas of electrons in the presence of a strong magnetic field shows a very peculiar behavior : the current is carried by one-dimensional channels along the edges of the sample. This suggests that one can use these so-called edge states as an electron beam the same way a laser produces a photon beam. A split gate on the top of the semiconductor provides the equivalent of a beam splitter, with the advantage compared to the optical one, that the voltage fixes the transparency of the splitter. At very low temperature, the phase coherence of the electrons extends over several micrometers and nanofabrication techniques are then able to realize a solid state device which mimics the standard Mach-Zehnder optical interferometer.
And also... Ulf Gennser
External collaborators: Fabien Portier and Patrice Roche (SPEC, CEA, Saclay).
Publications:< (updated on october 2013)