Magnetically tunable multiband near-field radiative heat transfer between two graphene sheets

Lixin Ge, Ke Gong, Yuping Cang, Yongsong Luo, Xi Shi, Ying Wu

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Near-field radiative heat transfer (NFRHT) is strongly related with many applications such as near-field imaging, thermo-photovoltaics and thermal circuit devices. The active control of NFRHT is of great interest since it provides a degree of tunability by external means. In this work, a magnetically tunable multiband NFRHT is revealed in a system of two suspended graphene sheets at room temperature. It is found that the single-band spectra for B=0 split into multiband spectra under an external magnetic field. Dual-band spectra can be realized for a modest magnetic field (e.g., B=4T). One band is determined by intraband transitions in the classical regime, which undergoes a blue shift as the chemical potential increases. Meanwhile, the other band is contributed by inter-Landau-level transitions in the quantum regime, which is robust against the change of chemical potentials. For a strong magnetic field (e.g., B=15T), there is an additional band with the resonant peak appearing at near-zero frequency (microwave regime), stemming from the magnetoplasmon zero modes. The great enhancement of NFRHT at such low frequency has been little reported. This work may pave a way for multiband thermal information transfer based on atomically thin graphene sheets.
Original languageEnglish (US)
JournalPhysical Review B
Volume100
Issue number3
DOIs
StatePublished - Jul 11 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): BAS/1626-01-01
Acknowledgements: This work is supported by the National Natural Science Foundation of China (Grants No. 11747100, No. 11704254, and No. 11804288), and the Innovation Scientists and Technicians Troop Construction Projects of Henan Province. The research of L.X.G. is further supported by Nanhu Scholars Program for Young Scholars of XYNU. Work in Saudi Arabia was supported by King Abdullah University of Science and Technology (KAUST) Baseline Research Fund BAS/1626-01-01.

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