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29 March 2024 |
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One-dimensional channel for Dirac electrons in a 3D topological insulator | Yoshinori Okada
; Wenwen Zhou
; Chetan. Dhital
; D. Walkup
; Ying Ran
; Z. Wang
; Stephen D. Wilson
; V. Madhavan
; | Date: |
29 Feb 2012 | Abstract: | Topological insulators represent a new state of matter where the topological
nature of the bulk bands dictates the existence of a surface state with unique
properties. These materials are predicted to host exotic states such as
Majorana Fermions and 1D chiral modes, many of which require a delicate tuning
of the surface state properties near the Dirac point by doping or gating. Using
scanning tunneling microscopy (STM) on the prototypical topological insulator
Bi2Te3, we have discovered one-dimensional topographic stripes, which induce
spatially modulated changes in the surface state dispersion close to the Dirac
point. In a magnetic field this results in a striped pattern of spatial regions
with alternating filling fractions. The observed modulation dictates the
existence of topological 1D chiral modes at the boundaries between stripes when
chemical potential is tuned properly, and provides a platform for the
experimental realization of 1D dissipationless quantum wires in topological
insulators. Our discovery that the slope of the surface state dispersion close
to the Dirac point is modulated over nanometer length scales by an intrinsic
topographic route represents a new paradigm for controlling the properties of
Dirac electrons. | Source: | arXiv, 1203.0020 | Services: | Forum | Review | PDF | Favorites |
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