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Paper   IPM / Nano-Sciences / 16761
School of Nano Science
  Title:   Near-Field Radiative Effect in a Td-WTe2 single layer
1.  Zhou Cheng-Long
2.  Zahra Torbatian
3.  Wu Xiaohu
4.  Yong Zhang
5.  Hong-Liang Yi
6.  Dino Novko
  Status:   Submitted
  Year:  2021
  Supported by:  IPM
In contrast to artificial metamaterials, natural two-dimensional (2D) hyperbolic materials are able to support higher electromagnetic confinement and stronger photonic density of states. This means natural 2D hyperbolic materials have fascinating potential for applications in thermal photonics. In this work, we investigate mechanisms of near-field thermal radiation (NFTR) in a Td�??WTe2 single layer at the nanoscale using the fluctuation-dissipation theorem and density-functional theory. The results show that NFTR of Td�?? WTe2 can be 3 orders of magnitude larger than the blackbody limit. By using the photonic tunneling coefficient and the plasmon dispersion, we present a comprehensive study of plasmonic properties of Td�??WTe2. Moreover, our first-principles calculations predict that application of a certain amount of mechanical stress can trigger topological transition between the elliptic and the hyperbolic surface states by regulating the Fermi surface and interband excitation threshold. Lastly, we systematically exhibit the evolution of surface plasmon polaritons in Td�??WTe2 under mechanical stress and analyze the performance of using mechanical stress to modulate the corresponding NFTR. Our work explores the great potential of tunable radiative heat flux in Td�??WTe2, which is explained here through the peculiar nature of hyperbolic surface plasmons.

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