Topological edge-state contributions to high-order harmonic generation in finite flakes

Jürß, Christoph; Bauer, Dieter

doi:10.1103/physrevb.106.054303

Cited by 2 publications

(1 citation statement)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, TIs based on bismuth compounds possess phonon spectra with characteristic features at terahertz (THz) frequencies (≈2–3 THz, 8–12 meV), which makes them ideal as nonlinear materials for the investigation of new phenomena such as high‐order non‐linear generation in unexplored frequency regions. [ 29 ] Strong light‐matter interaction in the far‐infrared has also drawn significant attention to the optical properties of Bi 2 Se 3 , which have been extensively characterized by Fourier‐transform infrared (FTIR) and time‐domain spectroscopies. These have demonstrated the presence of massless carriers at the TI surface, [ 14 ] although the relative contribution of surface and bulk states is still a subject of debate, as well as the possibility of exciting ultrafast surface shift currents.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Plasmon Polaritons in Large Area Bi₂Se₃ Topological Insulators

Pistore,

Viti,

Schiattarella

et al. 2023

Advanced Optical Materials

View full text Add to dashboard Cite

Assessing the nature of topological quantum materials, and in particular probing the existence of topological surface states, is a very challenging task. Terahertz (THz) frequency scattering near‐field optical microscopy has emerged as an effective technique to investigate the presence of massless surface carriers by locally probing collective surface excitations, i.e., plasmon polaritons, whose dispersion critically depends on the density and nature of surface carriers. Here, thin (14–19 nm) films of Bi2Se3 are experimentally investigated through a combination of x‐ray diffraction, Hall‐bar magneto‐transport, and near‐field detectorless optical holography at THz frequencies, from 2 to 4.3 THz. The dispersion of surface plasmon polaritons are determined for different Bi2Se3 film thicknesses, proving the presence of massless surface carriers. The results open intriguing opportunities in THz nano‐plasmonics and topological nano‐photonics including the development of superlenses and metasurfaces, making use of plasmon polaritons.

show abstract

Section: Introductionmentioning

confidence: 99%