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Coulomb drag and counterflow Seebeck coefficient in bilayer-graphene double layers

Published

Author(s)

Jiuning Hu, David B. Newell, Jifa Tian, Nikolai N. Klimov, Tailung Wu, Yong Chen

Abstract

We have fabricated bilayer-graphene double layers separated by a thin (~20 nm) boron nitride layer and performed Coulomb drag and counterflow thermoelectric transport measurements. The measured Coulomb drag resistivity is nearly three orders smaller in magnitude than the intralayer resistivities. The counterflow Seebeck coefficient is found to be well approximated by the difference between Seebeck coefficients of 1 individual layers and exhibit a peak in the regime where two layers have opposite sign of charge carriers. The measured maximum counterflow power factor is ~700 μW/K^2cm at room temperature, promising high power output per mass for lightweight thermoelectric applications. Our devices open a possibility for exploring the novel regime of thermoelectrics with tunable interactions between n-type and p-type channels based on graphene and other two-dimensional materials and their heterostructures.
Citation
Nano Energy

Keywords

graphene, Coulomb drag, Seebeck coefficient, two dimensional materials

Citation

Hu, J. , Newell, D. , Tian, J. , Klimov, N. , Wu, T. and Chen, Y. (2017), Coulomb drag and counterflow Seebeck coefficient in bilayer-graphene double layers, Nano Energy (Accessed April 15, 2024)
Created July 21, 2017, Updated January 27, 2020