Negative differential thermal conductance between Weyl semimetals nanoparticles through vacuum

Abstract

In this work, the near-field radiative heat transfer (NFRHT) between two Weyl semimetal (WSM) nanoparticles (NPs) is investigated. The numerical results show that negative differential thermal conductance (NDTC) effect can be obtained in this system, i.e., when the temperature of the emitter is fixed, the heat flux does not decrease monotonically with the increase of the temperature of the receiver. Specifically, when the temperature of the emitter is 300 K, the heat flux is identical when the temperature of the receiver is 50 K or 280 K. The NDTC effect is attributed to the fact that the permittivity of the WSMs changes with the temperature. The coupling effects of polarizability of two WSM NPs have been further identified at different temperature to reveal the physical mechanism of the NDTC effect. In addition, the NFRHT between two Weyl WSM NPs can be greatly enhanced by exciting the localized plasmon and circular modes. This work indicates that the WSMs maybe promising candidate materials for manipulating NFRHT.

References in corpus (5)

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• Radiative bistability and thermal memory
• Chiral anomaly and optical absorption in Weyl semimetals
• Radiative thermal diode driven by non-reciprocal surface waves
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Cited by in corpus (4)

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• Many-body interaction on near-field radiative heat transfer between two nanoparticles caused by proximate particle ensembles
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• Dynamical thermal near-field routing with the non-reciprocal Weyl semi-metal Co${}_3$Sn${}_2$S${}_2$