We use a Mach-Zehnder quantum Hall interferometer of a novel design to investigate the interference effects at fractional filling factors. Our device brings together the advantages of usual Mach-Zehnder and Fabry-Perot quantum Hall interferometers. It realizes the simplest-for-analysis Mach-Zehnder interference scheme, free from Coulomb blockade effects. By contrast to the standard Mach-Zehnder realization, our device does not contain an etched region inside the interference loop. For the first time for Mach-Zehnder interference scheme, the device demonstrates interference oscillations with Φ∗=e/e∗Φ0=Φ0/ν periodicity at fractional filling factor 1/3. This result indicates that we observe clear evidence for fractionally charged quasiparticles from simple Aharonov-Bohm interference.
@article{arxiv.1204.5568,
title = {Quantum Hall Mach-Zehnder interferometer at fractional filling factors},
author = {E. V. Deviatov and S. V. Egorov and G. Biasiol and L. Sorba},
journal= {arXiv preprint arXiv:1204.5568},
year = {2015}
}