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Thermionic emission in nodal-ring semimetals

Journal Article


Abstract


  • We theoretically investigate the thermionic emission from nodal-ring semimetals. The thermionic emission is found to be anisotropic in the x- and y-directions. The anisotropic emission can be enhanced by increasing the radius of nodal-ring b. The main feature of nodal-ring semimetals not only results in anisotropic thermionic emission but also affects the value of thermionic emission current density (TECD). The TECD of the lower branch of the energy-momentum dispersion increases with b, while the TECD of the upper branch decreases with b. Unlike in conventional materials, the TECD in nodal-ring semimetals depends on Fermi energy that is similar to the situation in Dirac semimetals. The underlined reason is that Dirac semimetals and nodal-ring semimetals have a linear or a linear-like energy-momentum dispersion while conventional materials have a parabolic energy-momentum dispersion. The TECD of nodal-ring semimetals depends strongly on work function and temperature.

UOW Authors


  •   Duan, Wenye (external author)
  •   Zhang, C

Publication Date


  • 2020

Citation


  • Chen, S., Huang, S., Duan, W., Shi, W., & Zhang, C. (2020). Thermionic emission in nodal-ring semimetals. Journal of Applied Physics, 128(6). doi:10.1063/5.0007139

Scopus Eid


  • 2-s2.0-85089945645

Volume


  • 128

Issue


  • 6

Abstract


  • We theoretically investigate the thermionic emission from nodal-ring semimetals. The thermionic emission is found to be anisotropic in the x- and y-directions. The anisotropic emission can be enhanced by increasing the radius of nodal-ring b. The main feature of nodal-ring semimetals not only results in anisotropic thermionic emission but also affects the value of thermionic emission current density (TECD). The TECD of the lower branch of the energy-momentum dispersion increases with b, while the TECD of the upper branch decreases with b. Unlike in conventional materials, the TECD in nodal-ring semimetals depends on Fermi energy that is similar to the situation in Dirac semimetals. The underlined reason is that Dirac semimetals and nodal-ring semimetals have a linear or a linear-like energy-momentum dispersion while conventional materials have a parabolic energy-momentum dispersion. The TECD of nodal-ring semimetals depends strongly on work function and temperature.

UOW Authors


  •   Duan, Wenye (external author)
  •   Zhang, C

Publication Date


  • 2020

Citation


  • Chen, S., Huang, S., Duan, W., Shi, W., & Zhang, C. (2020). Thermionic emission in nodal-ring semimetals. Journal of Applied Physics, 128(6). doi:10.1063/5.0007139

Scopus Eid


  • 2-s2.0-85089945645

Volume


  • 128

Issue


  • 6