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Mapping propagation of collective modes in Bi2Se3 and Bi2Te2.2Se0.8 topological insulators by near-field terahertz nanoscopy

Author

Listed:
  • Eva Arianna Aurelia Pogna

    (NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore)

  • Leonardo Viti

    (NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore)

  • Antonio Politano

    (University of L’Aquila)

  • Massimo Brambilla

    (Università degli Studi e Politecnico di Bari, and CNR-Istituto di Fotonica e Nanotecnologie)

  • Gaetano Scamarcio

    (Università degli Studi e Politecnico di Bari, and CNR-Istituto di Fotonica e Nanotecnologie)

  • Miriam Serena Vitiello

    (NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore)

Abstract

Near-field microscopy discloses a peculiar potential to explore novel quantum state of matter at the nanoscale, providing an intriguing playground to investigate, locally, carrier dynamics or propagation of photoexcited modes as plasmons, phonons, plasmon-polaritons or phonon-polaritons. Here, we exploit a combination of hyperspectral time domain spectroscopy nano-imaging and detectorless scattering near-field optical microscopy, at multiple terahertz frequencies, to explore the rich physics of layered topological insulators as Bi2Se3 and Bi2Te2.2Se0.8, hyperbolic materials with topologically protected surface states. By mapping the near-field scattering signal from a set of thin flakes of Bi2Se3 and Bi2Te2.2Se0.8 of various thicknesses, we shed light on the nature of the collective modes dominating their optical response in the 2-3 THz range. We capture snapshots of the activation of transverse and longitudinal optical phonons and reveal the propagation of sub-diffractional hyperbolic phonon-polariton modes influenced by the Dirac plasmons arising from the topological surface states and of bulk plasmons, prospecting new research directions in plasmonics, tailored nanophotonics, spintronics and quantum technologies.

Suggested Citation

  • Eva Arianna Aurelia Pogna & Leonardo Viti & Antonio Politano & Massimo Brambilla & Gaetano Scamarcio & Miriam Serena Vitiello, 2021. "Mapping propagation of collective modes in Bi2Se3 and Bi2Te2.2Se0.8 topological insulators by near-field terahertz nanoscopy," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26831-6
    DOI: 10.1038/s41467-021-26831-6
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