Limitations to Carrier Mobility and Phase-Coherent Transport in Bilayer Graphene

被引：55

作者：

Engels, S. ^{[1
,2
,3
]}

Terres, B. ^{[1
,2
,3
]}

Epping, A. ^{[1
,2
,3
]}

Khodkov, T. ^{[1
,2
,3
]}

Watanabe, K. ^{[4
]}

Taniguchi, T. ^{[4
]}

Beschoten, B. ^{[1
,2
]}

Stampfer, C. ^{[1
,2
,3
]}

机构：

[1] Rhein Westfal TH Aachen, JARA FIT, D-52074 Aachen, Germany

[2] Rhein Westfal TH Aachen, Inst Phys 2, D-52074 Aachen, Germany

[3] Forschungszentrum Julich, Peter Grunberg Inst PGI 9, D-52425 Julich, Germany

[4] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 12期

关键词：

DIRAC FERMIONS; BORON-NITRIDE; SUPERLATTICES; INTERFERENCE;

D O I：

10.1103/PhysRevLett.113.126801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 t(phi) as well as the inter- and intravalley scattering times tau(i) and t(*), respectively. While tau(phi) is in qualitative agreement with an electron-electron interaction-mediated dephasing mechanism, electron spin-flip scattering processes are limiting t(phi) at low temperatures. The analysis of tau(i) and tau(*) points to local strain fluctuation as the most probable mechanism for limiting the mobility in high-quality bilayer graphene.

引用

页数：5

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