Suppression of scattering in quantum confined 2D-helical Dirac systems

Abstract

Transport properties of disordered quantum confined helical Dirac systems are investigated in the large energy limit. As long as the 2D transport length is larger than the perimeter of the nanowire, the conductance and the Fano factor are sensitive to disorder only when the Fermi energy is close to an opening of a transverse mode. In the limit of a large number of transverse modes, transport properties are insensitive to the geometry of the nanowire or the nature and strength of the disorder but, instead, are dominated by the properties of the interface between the ohmic contact and the nanowire. In the case of a heavily doped Dirac metallic contact, the conductance is proportional to the energy with an average transmission $\mathcal{T}=\pi /4$ and a Fano factor of $F\simeq 0.13$. Those results can be generalized to a much broader class of contacts, the exact values of $\mathcal{T}$ and $F$ depending on the model used for the contacts. The energy dependence of Aharonov-Bohm oscillations is determined, when a magnetic flux is threaded through the cross section of the nanowire.

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• Electronic transport in two dimensional graphene
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• Aharonov-Bohm interference in topological insulator nanoribbons
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• Aharonov-Bohm interference and phase-coherent surface-state transport in topological insulator rings
• Gate-induced decoupling of surface and bulk state properties in selectively-deposited Bi${}_2$Te${}_3$ nanoribbons
• Disorder-induced coupling of Weyl nodes in WTe${}_2$
• Fabry-Pérot interferometry with gate-tunable 3D topological insulator nanowires
• Tracing Dirac points of topological surface states by ferromagnetic resonance
• Anisotropic transport properties in prismatic topological insulator nanowires
• Gate-Modulated Quantum Interference Oscillations in Sb-Doped Bi2Se3 Topological Insulator Nanoribbon