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20 April 2024

» arxiv » 1512.4439

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Enhanced transport length of spin-helical Dirac fermions in disordered 3D topological insulators
J. Dufouleur ; L. Veyrat ; B. Dassonneville ; C. Nowka ; S. Hampel ; P. Leksin ; B. Eichler ; O. G. Schmidt ; B. Büchner ; R. Giraud ;
Date:	14 Dec 2015
Abstract:	The transport length $l_ extrm{tr}$ and the mean free path $l_ extrm{e}$ are experimentally determined for bulk and surface states in a Bi$_2$Se$_3$ nanoribbon by quantum transport and transconductance measurements. We show that the anisotropic scattering of spin-helical Dirac fermions results in a strong enhancement of $l_ extrm{tr}$, which confirms theoretical predictions cite{Culcer2010}. Despite strong disorder ($l_ extrm{e}approx30$~nm), our result further points to the long-range nature of the scattering potential, giving a large ratio $l_ extrm{tr}/l_ extrm{e}approx8$ that is likely limited by a finite bulk/surface coupling. This suggests that the spin-flip length could reach the micron size in disordered 3D topological insulator nanostructures with a reduced bulk doping, even if due to charge compensation.
Source:	arXiv, 1512.4439
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