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Report on 2104.03373v2
Three-dimensional topological insulators (TIs) host helical Dirac surface states at the interface with a trivial insulator. In quasi-one-dimensional TI nanoribbon structures the wave function of surface charges extends phase-coherently along the perimeter of the nanoribbon, resulting in a quantization of transverse surface modes. Furthermore, as the inherent spin-momentum locking results in a Berry phase offset of π of self-interfering charge carriers an energy gap within the surface statedoi:10.21468/scipost.report.4019 fatcat:jijkf6x5nbc3zp2iz65y74b6i4