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The transport length $l_\textrm{tr}$ and the mean free path $l_\textrm{e}$are experimentally determined for bulk and surface states in a Bi$_2$Se$_3$nanoribbon by quantum transport and transconductance measurements. We show thatthe anisotropic scattering of spin-helical Dirac fermions results in a strongenhancement of $l_\textrm{tr}$, which confirms theoretical predictions\cite{Culcer2010}. Despite strong disorder ($l_\textrm{e}\approx30$~nm), ourresult further points to the long-range nature of the scattering potential,giving a large ratio $l_\textrm{tr}/l_\textrm{e}\approx8$ that is likelylimited by a finite bulk/surface coupling. This suggests that the spin-fliplength could reach the micron size in disordered 3D topological insulatornanostructures with a reduced bulk doping, even if due to charge compensation.

Enhanced transport length of spin-helical Dirac fermions in disordered 3D topological insulators