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

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

2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)（2019）

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Abstract

Beside massless Dirac fermions, topological insulator surfaces can host a massive two-dimensional electron gas. Using near-field spectroscopy, we identify both of these surface states by retrieving the nanoscale dielectric function without any model assumptions. © 2019 The Author(s)

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Key words

surface states,three-dimensional topological insulator,massless Dirac fermions,topological insulator surfaces,near-field spectroscopy,massive two-dimensional electron gas,near-field tomography,nanoscale dielectric function

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