Enhanced Thermoelectric Power in Graphene: Violation of the Mott Relation By Inelastic Scattering

Fereshte Ghahari; Hong-Yi Xie; Kenji Watanabe; Matthew S. Foster; Philip Kim; Takashi Taniguchi

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Enhanced Thermoelectric Power in Graphene: Violation of the Mott Relation By Inelastic Scattering

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arxiv 1601.05859 v2 pith:K54AG32G submitted 2016-01-22 cond-mat.mes-hall

Fereshte Ghahari , Hong-Yi Xie , Takashi Taniguchi , Kenji Watanabe , Matthew S. Foster , Philip Kim This is my paper

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keywords inelasticscatteringdisordergraphenehydrodynamicmottpowerprediction

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We report the enhancement of the thermoelectric power (TEP) in graphene with extremely low disorder. At high temperature we observe that the TEP is substantially larger than the prediction of the Mott relation, approaching to the hydrodynamic limit due to strong inelastic scattering among the charge carriers. However, closer to room temperature the inelastic carrier-optical-phonon scattering becomes more significant and limits the TEP below the hydrodynamic prediction. We support our observation by employing a Boltzmann theory incorporating disorder, electron interactions, and optical phonons.

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