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Pseudo-ballistic transport in 3D topological insulator quantum wires

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arxiv 1504.08030 v1 pith:QLVRMQXE submitted 2015-04-29 cond-mat.mes-hall

Pseudo-ballistic transport in 3D topological insulator quantum wires

classification cond-mat.mes-hall
keywords quantumtransportpseudo-ballisticwiresconductancefluctuationsinsulatorproperties
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

Quantum conductance fluctuations are investigated in disordered 3D topological insulator quantum wires. Both experiments and theory reveal a new transport regime in a mesoscopic conductor, pseudo-ballistic transport, for which ballistic properties persist beyond the transport mean free path, characteristic of diffusive transport. It results in non-universal conductance fluctuations due to quasi-1D surface modes, as observed in long and narrow Bi$_2$Se$_3$ nanoribbons. Spin helical Dirac fermions in quantum wires retain pseudo-ballistic properties over an unusually broad energy range, due to strong quantum confinement and weak momentum scattering.

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