High Magnetic Field Laboratory, 25 Avenue des Martyrs, 38042 Grenoble, France Institut Universitaire de France and INSA, 31077 Toulouse, France
Harvey E. Beere and David A. Ritchie
Cavendish Laboratory, University of Cambridge, CB3 0HE Cambridge, UK
Department of Physics, Imperial College, London SW7 2AZ, UK
Received March 31, 2008
We report on the photoresistance of a magnetic quantum wire obtained by applying a gradient of magnetic field to a two-dimensional electron gas. Electron transmission through the magnetic wire increases by an order of magnitude under microwave irradiation and exhibits frequency dependent magneto-oscillations as a function of the in plane magnetic field. Both results are fully consistent with microwave coupled Luttinger liquid edge channels which interfere at two pinning sites in the fashion of a Mach–Zehnder interferometer.