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23 April 2024

» arxiv » 1911.5968

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Tunable Valley Splitting due to Topological Orbital Magnetic Moment in Bilayer Graphene Quantum Point Contacts
Yongjin Lee ; Angelika Knothe ; Peter Rickhaus ; Hiske Overweg ; Marius Eich ; Annika Kurzmann ; Takashi Taniguchi ; Kenji Wantanabe ; Vladimir Fal'ko ; Thomas Ihn ; Klaus Ensslin ;
Date:	14 Nov 2019
Abstract:	We experimentally determine the energy spectrum of a quantum point contact realized by a suitable gate geometry in bilayer graphene. Using finite bias spectroscopy we measure the energy scales arising from the lateral confinement as well as the Zeeman splitting and find a spin g-factor ~2. The valley g-factor is highly tunable by vertical electric fields and reaches values in the range ~40-120. The results are quantitatively explained by a calculation considering topological magnetic moment and its dependence on confinement and the vertical displacement field.
Source:	arXiv, 1911.5968
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