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Electronic Mach-Zehnder interference in a bipolar hybrid monolayer-bilayer graphene junction

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Title
Electronic Mach-Zehnder interference in a bipolar hybrid monolayer-bilayer graphene junction
Author(s)
M. Mirzakhani; Myoung, N.; Peeters, F.M.; H.C. Park
Publication Date
2023-01
Journal
Carbon, v.201, pp.734 - 744
Publisher
Pergamon Press Ltd.
Abstract
© 2022 Elsevier LtdGraphene matter in a strong magnetic field, realizing one-dimensional quantum Hall channels, provides a unique platform for studying electron interference. Here, using the Landauer-Büttiker formalism along with the tight-binding model, we investigate the quantum Hall (QH) effects in unipolar and bipolar monolayer-bilayer graphene (MLG-BLG) junctions. We find that a Hall bar made of an armchair MLG-BLG junction in the bipolar regime results in valley-polarized edgechannel interferences and can operate a fully tunable Mach-Zehnder (MZ) interferometer device. Investigation of the bar-width and magnetic-field dependence of the conductance oscillations shows that the MZ interference in such structures can be drastically affected by the type of (zigzag) edge termination of the second layer in the BLG region [composed of vertical dimer or non-dimer atoms]. Our findings reveal that both interfaces exhibit a double set of Aharonov-Bohm interferences, with the one between two oppositely valley-polarized edge channels dominating and causing a large amplitude conductance oscillation ranging from 0 to 2e2/h. We explain and analyze our findings by analytically solving the Dirac-Weyl equation for a gated semi-infinite MLG-BLG junction.
URI
https://pr.ibs.re.kr/handle/8788114/12462
DOI
10.1016/j.carbon.2022.09.058
ISSN
0008-6223
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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