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Tunable Valley Splitting due to Topological Orbital Magnetic Moment in Bilayer Graphene Quantum Point Contacts
Physical Review Letters ( IF 9.227 ) Pub Date : 2020-03-24 , DOI: 10.1103/physrevlett.124.126802
Yongjin Lee, Angelika Knothe, Hiske Overweg, Marius Eich, Carolin Gold, Annika Kurzmann, Veronika Klasovika, Takashi Taniguchi, Kenji Wantanabe, Vladimir Fal’ko, Thomas Ihn, Klaus Ensslin, and Peter Rickhaus

In multivalley semiconductors, the valley degree of freedom can be potentially used to store, manipulate, and read quantum information, but its control remains challenging. The valleys in bilayer graphene can be addressed by a perpendicular magnetic field which couples by the valley g factor gv. However, control over gv has not been demonstrated yet. 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 gs∼2. gv can be tuned by a factor of 3 using vertical electric fields, gv∼40–120. The results are quantitatively explained by a calculation considering topological magnetic moment and its dependence on confinement and the vertical displacement field.
更新日期:2020-03-26

 

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