Pyroelectric origin of the carrier density modulation at graphene-ferroelectric interface
arXiv:1210.6319 · doi:10.1063/1.4812244
Abstract
Using continuous approximation we study the static and high-frequency heat dissipation in multi-layer graphene on a ferroelectric. We demonstrate that the Joule heating effect, caused by a high-frequency ac electric current in graphene, creates a pronounced temperature gradient in a ferroelectric substrate. The pyroelectric effect transforms the gradient into the spontaneous polarization gradient.. Therefore, the high-frequency depolarizing electric field occurs and penetrates in the multi-layer graphene. Free charges in graphene immediately screen the electric field and thus their density oscillates at high-frequency. Performed calculations had proved that the pyroelectric effect can modify essentially the free carrier density at the graphene-ferroelectric interface and consequently the conductivity of multi-layer graphene channel. So, pyroelectric mechanism can be critical for understanding of the complex physical thermal and electrical processes taking place across and along graphene-ferroelectric interfaces at terahertz frequencies.
27 pages, 8 figures, 1 appendix, 1 table
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Cited by in corpus (9)
- P-N junctions dynamics in graphene channel induced by ferroelectric domains motion
- Ferroelectric domain triggers the charge modulation in semiconductors
- Piezoresponse of ferroelectric films in ferroionic states: time and voltage dynamics
- Pyroelectric origin of the carrier density modulation at graphene-ferroelectric interface
- Limits for the graphene on ferroelectric domain wall p-n-junction rectifier for different regimes of current
- Impact of the domain structure in ferroelectric substrate on graphene conductance (authors' review)
- Nontrivial temperature behavior of the carrier concentration in the nanostructure "graphene channel on ferroelectric substrate with domain walls"
- Graphene separation and stretching induced by piezoelectric effect of ferroelectric domains: impact on the conductance of graphene channel
- Ballistic conductivity of graphene channel with p-n junction on ferroelectric domain wall