Self-heating and nonlinear current-voltage characteristics in bilayer graphene

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2011
Major/Subject
Mcode
Degree programme
Language
en
Pages
205421/1-8
Series
Physical Review B, Volume 83, Issue 20
Abstract
We demonstrate by experiments and numerical simulations that the low-temperature current-voltage characteristics in diffusive bilayer graphene (BLG) exhibit a strong superlinearity at finite bias voltages. The superlinearity is weakly dependent on doping and on the length of the graphene sample. This effect can be understood as a result of Joule heating. It is stronger in BLG than in monolayer graphene (MLG), since the conductivity of BLG is more sensitive to temperature due to the higher density of electronic states at the Dirac point.
Description
Keywords
graphene, BLG, superlinearity
Citation
Viljas, J. K. & Fay, A. & Wiesner, M. & Hakonen, Pertti J. 2011. Self-heating and nonlinear current-voltage characteristics in bilayer graphene. Physical Review B. Volume 83, Issue 20. 205421/1-8. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.83.205421