Large Nernst effect in chemically derived multilayer graphene at millitesla magnetic fields
Abstract
Simple synthesis of graphitic compounds, their high conductivity, and integrability with other materials motivate the effort toward graphite-based thermoelectric generators. At the same time, semimetallic nature of graphite and graphene results in nearly-zero thermopower due to electron-hole compensation. Here, we observe large transverse thermopower in chemically derived multilayer graphene films with strong fluctuations of thickness and carrier density at low magnetic fields B. Using the scanning laser-induced heating of macroscopic film, we find that transverse (Nernst) thermoelectric voltage becomes comparable to the longitudinal thermoelectric voltage at the metal-doped graphene contact at B*≈4 mT and ambient conditions. Estimates of transverse thermopower Sxy based on the known laser-induced temperature show that it is as large as ∼ 10 μV/K at B*, and raises in a sub-linear fashion to 250 μV/K at B≈315 mT, the maximum field we reach with centimeter-sized permanent magnet. Extra increase in thermoelectric signal is achieved upon voltage measurement at Hall probes when the dc field lines are co-directional with local Nernst current. Our results show the promise of large-scale multilayer graphene for thermoelectricity generation.
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BibTeX
@misc{semkin2026large,
title = {{Large Nernst effect in chemically derived multilayer graphene at millitesla magnetic fields}},
author = {Valentin Semkin and Denis Borisenko and Yana Litun and Oleg Kononenko and Dmitry Mylnikov and Alexey Bocharov and Dmitry Svintsov},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.05898},
eprint = {2609.05898},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.05898},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Large Nernst effect in chemically derived multilayer graphene at millitesla magnetic fields
AU - Valentin Semkin
AU - Denis Borisenko
AU - Yana Litun
AU - Oleg Kononenko
AU - Dmitry Mylnikov
AU - Alexey Bocharov
AU - Dmitry Svintsov
PY - 2026
DA - 2026/09/05
PB - arXiv
DO - 10.48550/arxiv.2609.05898
UR - https://arxiv.org/abs/2609.05898
AB - Simple synthesis of graphitic compounds, their high conductivity, and integrability with other materials motivate the effort toward graphite-based thermoelectric generators. At the same time, semimetallic nature of graphite and graphene results in nearly-zero thermopower due to electron-hole compensation. Here, we observe large transverse thermopower in chemically derived multilayer graphene films with strong fluctuations of thickness and carrier density at low magnetic fields B. Using the scanning laser-induced heating of macroscopic film, we find that transverse (Nernst) thermoelectric voltage becomes comparable to the longitudinal thermoelectric voltage at the metal-doped graphene contact at B^*≈4 mT and ambient conditions. Estimates of transverse thermopower S_xy based on the known laser-induced temperature show that it is as large as ∼ 10 μV/K at B^*, and raises in a sub-linear fashion to 250 μV/K at B≈315 mT, the maximum field we reach with centimeter-sized permanent magnet. Extra increase in thermoelectric signal is achieved upon voltage measurement at Hall probes when the dc field lines are co-directional with local Nernst current. Our results show the promise of large-scale multilayer graphene for thermoelectricity generation.
ER -