Fig. 3: Electrodynamics and plasmonic response of 3L WTe2.
From: Terahertz response of monolayer and few-layer WTe2 at the nanoscale
Modeled imaginary part of the momentum dependent p-polarized reflection coefficient \({r}_{p}(\omega ,q)\) at a 44 K and b 290 K, based on bulk dielectric function data21. The red points located at \(q=3.3e3\,{{{\mathrm{c}}}}{{{{\mathrm{m}}}}}^{-1}\) (\(\lambda =19\upmu {{{\mathrm{m}}}}\)) and \(q=1.0e4\,{{{{\mathrm{c}}}}}{{{{\mathrm{m}}}}}^{-1}\) (\(\lambda =6.3\upmu {{{\mathrm{m}}}}\)) indicate the momentum of SPP at 0.6 THz. Free space (FS) and SiO2 (S) light lines are indicated with dashed lines, respectively. SPP dispersions are clearly observed, and the dispersion broadens with increasing temperature. c Spectra of the near-field scattering amplitude modeled following McLeod et al.45 at different temperatures based on calculated \({r}_{p}(\omega ,q)\). The shaded area indicates the frequency spectrum of our THz source.
