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News 05.07.2025
New publication: Electric-Field-Tunable Spin−Orbit Gap in a Bilayer Graphene/WSe2 Quantum Dot

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News 16.09.2014

New publication: Limitations to carrier mobility and phase-coherent transport in bilayer graphene

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Phys. Rev. Lett. 113, 126801 (2014)
We present transport measurements on high-mobility bilayer graphene fully encapsulated in hexagonal boron nitride. We show two terminal quantum Hall effect measurements which exhibit full symmetry broken Landau levels at low magnetic fields. From weak localization measurements, we extract gate-tunable phase coherence times τφ as well as the inter- and intra-valley scattering times τi and τ. While τφ is in qualitative agreement with an electron-electron interaction mediated dephasing mechanism, electron spin-flip scattering processes are limiting τφ at low temperatures. The analysis of τi and τ points to local strain fluctuation as the most probable mechanism for limiting the mobility in high-quality bilayer graphene.

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