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Valley splitter and transverse valley focusing in twisted bilayer graphene
- Source :
- Physical Review Research. 2
- Publication Year :
- 2020
- Publisher :
- American Physical Society (APS), 2020.
-
Abstract
- We study transport in twisted bilayer graphene and show that electrostatic barriers can act as valley splitters, where electrons from the $K$ ($K'$) valley are transmitted only to e.g.\ the top (bottom) layer, leading to valley-layer locked currents. We show that such a valley splitter is obtained when the barrier varies slowly on the moir\'e scale and induces a Lifshitz transition across the junction, i.e.\ a change in the Fermi surface topology. Furthermore, we show that for a given valley the reflected and transmitted current are transversely deflected, as time-reversal symmetry is effectively broken in each valley separately, resulting in valley-selective transverse focusing at zero magnetic field.<br />Comment: 13 pages, 13 figures
- Subjects :
- Transverse plane
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Splitter
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
FOS: Physical sciences
Current (fluid)
Twist
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Bilayer graphene
Physics::Atmospheric and Oceanic Physics
Subjects
Details
- ISSN :
- 26431564
- Volume :
- 2
- Database :
- OpenAIRE
- Journal :
- Physical Review Research
- Accession number :
- edsair.doi.dedup.....bbdf373ea99a7ee70c51de8229f2feb8
- Full Text :
- https://doi.org/10.1103/physrevresearch.2.043151