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Tunable metal-insulator transition in double-layer graphene heterostructures

Ponomarenko, L A; Geim, A K; Zhukov, A A; Jalil, R; Morozov, S V; Novoselov, K S; Grigorieva, I V; Hill, E H; Cheianov, V V; Fal'ko, V I; Watanabe, K; Taniguchi, T; Gorbachev, R V

Nature Physics. 2011;7(12):958-961.

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Abstract

Disordered conductors with resistivity above the resistance quantum h/e(2) should exhibit an insulating behaviour at low temperatures, a universal phenomenon known as a strong (Anderson) localization(1-3). Observed in a multitude of materials, including damaged graphene and its disordered chemical derivatives(4-10), Anderson localization has not been seen in generic graphene, despite its resistivity near the neutrality point reaching approximate to h/e(2) per carrier type(4,5). It has remained a puzzle why graphene is such an exception. Here we report a strong localization and the corresponding metal-insulator transition in ultra-high-quality graphene. The transition is controlled externally, by changing the carrier density in another graphene layer placed at a distance of several nm and decoupled electrically. The entire behaviour is explained by electron-hole puddles that disallow localization in standard devices but can be screened out in double-layer graphene. The localization that occurs with decreasing rather than increasing disorder is a unique occurrence, and the reported double-layer heterostructures presents a new experimental system that invites further studies.

Bibliographic metadata

Type of resource:
Content type:
Publication type:
Publication form:
Published date:
Language:
english
Journal title:
Alternative journal title:
Nat Phys
ISSN:
Volume:
7
Issue:
12
Start page:
958
End page:
961
Total:
4
Digital Object Identifier:
10.1038/nphys2114
ISI Accession Number:
ISI:000298186100019
Related website(s):
  • Related website <Go to ISI>://000298186100019
General notes:
  • 863RU Times Cited:2 Cited References Count:31
Access state:
Active

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University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:192527
Created by:
Hawthornthwaite, Sabina
Created:
19th April, 2013, 14:51:07
Last modified by:
Clayton, Leanda
Last modified:
11th March, 2014, 11:00:37

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