Year: 2022
Type: article
Abstract: Recent experiments have shown that electronic Mach-Zehnder interferometers of unprecedented fidelities could be built using a graphene $pn$ junction in the quantum Hall regime. In these junctions, two different edge states corresponding to two different valley configurations are spatially separated and form the two arms of the interferometer. The observed separation, of several tens of nanometers, has been found to be abnormally high and thus associated to unrealistic values of the exchange interaction. In this work, we show that, although the separation is due to exchange interaction, its actual value is entirely governed by the sample geometry and independent of the value of the exchange splitting. Our analysis follows the lines of the classical work of Chklovski-Shklovskii-Glazman on electrostatically induced edge state reconstruction and includes quantitative numerical calculations in the experimental geometries.
Institutions: Institut polytechnique de Grenoble, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Grenoble, Institut de Recherche Interdisciplinaire de Grenoble, Université Grenoble Alpes, Centre National de la Recherche Scientifique, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, CEA Paris-Saclay
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Horizon 2020
Award: G2438011427
OpenAlex ID: W4283267017