Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 47: Transport in high magnetic field/quantum-Hall-effect

HL 47.10: Talk

Thursday, March 29, 2007, 18:00–18:15, H14

Two beam Aharonov-Bohm interference in the integer quantum Hall regime — •Leonid Litvin, Peter Tranitz, Werner Wegscheider, and Christoph Strunk — Uni Regensburg

We have built an electronic Mach-Zehnder interferometer (MZI) [1] using high mobility GaAs/AlGaAs heterostructures with the purpose to study electron interference and shot noise in this system. The maximum interference visibility of our device was near 20% at filling factor ν=1. It was found earlier that the Aharonov-Bohm oscillation amplitude varies nonmonotonically with energy [2]. We confirm this behavior for a MZI 1.5 times bigger in size with about 1.4 times higher electron density. In spite of these difference the characteristic energy in our experiment was found to be 10 µV, similar as in [2]. The interference appears in a broad range of magnetic field between filling factors 1 and 2. The visibility is highest at certain resonances in the transmission of the quantum point contact. [1] Yang Ji et al., Nature 422, 415 (2003) [2] I. Neder et al., Phys.Rev.Lett. 96, 016804 (2006).