Journal Article

FZJ-2015-02790

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Limitations to Carrier Mobility and Phase-Coherent Transport in Bilayer Graphene

Engels, S.FZJ* ; Terrés, B.FZJ* ; Epping, A.FZJ* ; Khodkov, T.FZJ* ; Watanabe, K. ; Taniguchi, T. ; Beschoten, B. ; Stampfer, C. (Corresponding Author)FZJ*

2014
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/8550  doi:10.1103/PhysRevLett.113.126801

Abstract: 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 intravalley scattering times τi and τ∗, respectively. 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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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA-FIT (JARA-FIT)

Research Program(s):

1. 422 - Spin-based and quantum information (POF2-422) (POF2-422)

Appears in the scientific report 2014

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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