Fig. 5: Relative propagation length L/λp of 2.52 THz polaritons as a function of wavevector and group velocity.
From: Real-space nanoimaging of THz polaritons in the topological insulator Bi2Se3
a Polariton amplitude decay time is \(\tau\) = 0.48 ps. Black numbers indicate the relative propagation lengths. White symbol shows experimental relative propagation length for THz polaritons in the 25-nm-thick Bi2Se3. b Polariton amplitude decay time is \(\tau\) = 0.6 ps. Black numbers indicate the relative propagation length. Black symbol shows the experimental relative propagation length of acoustic graphene plasmon (AGP) of an amplitude decay time of 0.6 ps in high-quality graphene encapsulated in h-BN (data taken from Alonso-Gonzalez et al.31).
