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Published on: July 24, 2015
Kagome Quantum Oscillations in Graphene Superlattices
Folkert K de Vries1, Sergey Slizovskiy2,3, Petar Tomić1
1Laboratory for Solid State Physics, ETH Zürich, Zürich CH-8093, Switzerland.
Abstract:
Electronic spectra of solids subjected to a magnetic field are often discussed in terms of Landau levels and Hofstadter-butterfly-style Brown-Zak minibands manifested by magneto-oscillations in two-dimensional electron systems. Here, we present the semiclassical precursors of these quantum magneto-oscillations which appear in graphene superlattices at low magnetic field near the Lifshitz transitions and persist at elevated temperatures. These oscillations originate from Aharonov-Bohm interference of electron waves following open trajectories that belong to a kagome-shaped network of paths characteristic for Lifshitz transitions in the moire superlattice minibands of twistronic graphenes.
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