Nanoscale Near-Field Tomography of Surface States on (Bi(0.5)b(0.5))(2)Te-3

Fabian Mooshammer, Fabian Sander, Markus Huber, Martin Zizlsperger, Helena Weigand, Markus Plankl, Christian Weyrich, Martin Lanius, Jörn Kampmeier, Gregor Mussler, Detlev Grützmacher, Jessica Louise Boland, Tyler Cocker, Rupert Huber

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    Abstract

    Three-dimensional topological insulators (TIs) have attracted tremendous interest for their possibility to host massless Dirac Fermions in topologically protected surface states (TSSs), which may enable new kinds of high-speed electronics. However, recent reports have outlined the importance of band bending effects within these materials, which results in an additional two-dimensional electron gas (2DEG) with finite mass at the surface. TI surfaces are also known to be highly inhomogeneous on the nanoscale, which is masked in conventional far-field studies. Here, we use near-field microscopy in the mid-infrared spectral range to probe the local surface properties of custom-tailored (Bi0.5Sb0.5)2Te3 structures with nanometer precision in all three spatial dimensions. Applying nanotomography and nanospectroscopy, we reveal a few-nanometer-thick layer of high surface conductivity and retrieve its local dielectric function without assuming any model for the spectral response. This allows us to directly distin...
    Original languageEnglish
    Pages (from-to)7515-7523
    Number of pages9
    JournalNano Letters
    Volume18
    Issue number12
    Early online date13 Nov 2018
    DOIs
    Publication statusPublished - 12 Dec 2018

    Keywords

    • Near-field microscopy
    • SNOM
    • band bending
    • surface state
    • tomography
    • topological insulator

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    • Mid-Infrared Nano-Tomography of Topological Insulator Surfaces

      Mooshammer, F., Sandner, F., Huber, M. A., Zizlsperger, M., Weigand, H., Plankl, M., Weyrich, C., Lanius, M., Kampmeier, J., Mussler, G., Grutzmacher, D., Boland, R., Cocker, T. L. & Huber, R., 1 Sept 2019, International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. IEEE

      Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    • Nanoscale mid-infrared near-field tomography of topological insulator surfaces

      Mooshammer, F., Sandner, F., Huber, M. A., Zizlsperger, M., Weigand, H., Plankl, M., Weyrich, C., Lanius, M., Kampmeier, J., Mussler, G., Grützmacher, D., Boland, R., Cocker, T. L. & Huber, R., 23 Jun 2019, Optics InfoBase Conference Papers. IEEE

      Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    • Near-Field Tomography and Spectroscopy of Surface States on a Three-Dimensional Topological Insulator

      Sandner, F., Mooshammer, F., Huber, M. A., Zizlsperger, M., Weigand, H., Plankl, M., Weyrich, C., Lanius, M., Kampmeier, J., Mussler, G., Grutzmacher, D., Boland, R., Cocker, T. L. & Huber, R., 5 May 2019, 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings.

      Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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