We investigate the quantum Hall effect (QHE) in a graphene sample with Hall-bar geometry close to the Dirac point at high magnetic fields up to 28 T. We have discovered a plateau–insulator quantum phase transition passing from the last plateau for the integer QHE in graphene to an insulator regime ν=−2→ν=0. The analysis of the temperature dependence of the longitudinal resistance gives a value for the critical exponent associated with the transition equal to κ=0.58±0.03.
Plateau–insulator transition in graphene / Amado, M.; Diez, E.; López-Romero, D.; Rossella, F.; Caridad, J. M.; Dionigi, F.; Bellani, V.; Maude, D. K.. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 12:(2010), pp. 053004-1-053004-9. [10.1088/1367-2630/12/5/053004]
Plateau–insulator transition in graphene
F. Rossella;
2010
Abstract
We investigate the quantum Hall effect (QHE) in a graphene sample with Hall-bar geometry close to the Dirac point at high magnetic fields up to 28 T. We have discovered a plateau–insulator quantum phase transition passing from the last plateau for the integer QHE in graphene to an insulator regime ν=−2→ν=0. The analysis of the temperature dependence of the longitudinal resistance gives a value for the critical exponent associated with the transition equal to κ=0.58±0.03.
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