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

Abstract

Near-field radiative heat transfer (NFRHT) is strongly related with many applications such as near-field imaging, thermos-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 multi-band 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 multi-band spectra under an external magnetic field. Dual-band spectra can be realized for a modest magnetic field (e.g., B=4 T). One band is determined by intra-band 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=15 T), there is an additional band with the resonant peak appearing at near-zero frequency (microwave regime), stemming from the magneto-plasmon zero modes. The great enhancement of NFRHT at such low frequency has not been found in any previous systems yet. This work may pave a way for multi-band thermal information transfer based on atomically thin graphene sheets.

8 pages, 7 figures

References in corpus (12)

• Ultrahigh electron mobility in suspended graphene
• The structure of suspended graphene sheets
• Graphene plasmonics
• Magneto-optical conductivity in Graphene
• Landau Level Splitting in Graphene in High Magnetic Fields
• Giant Faraday rotation in single- and multilayer graphene
• Near-field heat transfer between graphene/hBN multilayers
• Radiative bistability and thermal memory
• Towards boolean operations with thermal photons
• Enhanced optical activity in hyperbolic metasurfaces
• Thermotronics: toward nanocircuits to manage radiative heat flux
• Ultrafast modulation of near-field heat transfer with tunable metamaterials

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• Performance improvement of three-body radiative diode driven by graphene surface plasmon polaritons
• Multiple magnetoplasmon polaritons of magneto-optical graphene in near-field radiative heat transfer
• Controlling electric and magnetic Purcell effects in phosphorene via strain engineering
• Anisotropic resonance energy transfer with strained phosphorene
• Near-field radiation assisted smart skin for spacecraft thermal control