Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q68: Thermal and Electrical Transport in Nanomaterials
3:00 PM–5:36 PM,
Wednesday, March 16, 2022
Room: Hyatt Regency Hotel -Hyde Park B
Sponsoring
Unit:
DMP
Chair: Andrea Pickel, University of Rochester
Abstract: Q68.00008 : Aharonov-Bohm effect for the network of critical trajectories near Lifshitz transition leads to precursors of Brown-Zak oscillations.*
5:12 PM–5:24 PM
Presenter:
Sergey Slizovskiy
(Univ of Manchester)
Authors:
Sergey Slizovskiy
(Univ of Manchester)
Folkert K De Vries
(ETH Zurich)
Petar Tomic
(ETH Zurich)
Aitor Garcia-Ruiz
(Univ of Manchester)
Giulia Zheng
(ETH Zurich)
Elias Portoles
(ETH Zurich)
Kenji Watanabe
(NIMS, Tsukuba)
Takashi Taniguchi
(NIMS, Tsukuba)
Vladimir Fal'ko
(Univ of Manchester)
Klaus Ensslin
(ETH Zurich)
Thomas Ihn
(ETH, Zurich)
Peter Rickhaus
(ETH, Zurich)
We show that interference of electronic paths on the network leads to conductance oscillations periodic in the inverse magnetic flux per unit cell that survive elevated temperatures and correspond to Brown-Zak oscillations. We develop an intuitive semiclassical approach explaining the magnitude of the oscillations. Surprisingly, for hexagonal systems with C3 symmetry, the oscillations are maximal away from the Lifshitz transition, which is explained by the topology of interfering paths.
Our findings are supported by comparison with experimental data for twisted double-bilayer graphene.
*EU Graphene Flagship Core 3Swiss NSF via NCCR Quantum ScienceEU Horizon2020 grant 862660/QUANTUM E LEAPS
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