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- Title
Scaling behavior of electron decoherence in a graphene Mach-Zehnder interferometer.
- Authors
Jo, M.; Lee, June-Young M.; Assouline, A.; Brasseur, P.; Watanabe, K.; Taniguchi, T.; Roche, P.; Glattli, D. C.; Kumada, N.; Parmentier, F. D.; Sim, H. -S.; Roulleau, P.
- Abstract
Over the past 20 years, many efforts have been made to understand and control decoherence in 2D electron systems. In particular, several types of electronic interferometers have been considered in GaAs heterostructures, in order to protect the interfering electrons from decoherence. Nevertheless, it is now understood that several intrinsic decoherence sources fundamentally limit more advanced quantum manipulations. Here, we show that graphene offers a unique possibility to reach a regime where the decoherence is frozen and to study unexplored regimes of electron interferometry. We probe the decoherence of electron channels in a graphene quantum Hall PN junction, forming a Mach-Zehnder interferometer1,2, and unveil a scaling behavior of decay of the interference visibility with the temperature scaled by the interferometer length. It exhibits a remarkable crossover from an exponential decay at higher temperature to an algebraic decay at lower temperature where almost no decoherence occurs, a regime previously unobserved in GaAs interferometers. Quantum Hall edge channels provide a platform to study electron interference, however understanding decoherence in these systems remains an open problem. Jo et al. realize a regime of suppressed decoherence in an electronic Mach-Zehnder interferometer formed in a graphene quantum Hall pn junction.
- Subjects
GRAPHENE; ELECTRONS; ELECTRONIC probes; LOW temperatures; INTERFEROMETERS; HIGH temperatures
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-33078-2