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 Bi2Se3 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.
@article{arxiv.1504.08030,
title = {Pseudo-ballistic transport in 3D topological insulator quantum wires},
author = {Joseph Dufouleur and Louis Veyrat and Emmanouil Xypakis and Jens H. Bardarson and Christian Nowka and Silke Hampel and Barbara Eichler and Oliver G. Schmidt and Bernd Büchner and Romain Giraud},
journal= {arXiv preprint arXiv:1504.08030},
year = {2017}
}
Comments
Main text,4 figures; Supplementary Information, 3 figures