Enhanced transport length of spin-helical Dirac fermions in disordered 3D topological insulators
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
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2015
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| author | Dufouleur, J. Veyrat, L. Dassonneville, B. Nowka, C. Hampel, S. Leksin, P. Eichler, B. Schmidt, O. G. Büchner, B. Giraud, R. |
| author_facet | Dufouleur, J. Veyrat, L. Dassonneville, B. Nowka, C. Hampel, S. Leksin, P. Eichler, B. Schmidt, O. G. Büchner, B. Giraud, R. |
| contents | 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 that the anisotropic scattering of spin-helical Dirac fermions results in a strong enhancement of $l_\textrm{tr}$, which confirms theoretical predictions \cite{Culcer2010}. Despite strong disorder ($l_\textrm{e}\approx30$~nm), our result further points to the long-range nature of the scattering potential, giving a large ratio $l_\textrm{tr}/l_\textrm{e}\approx8$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1512_04439 |
| institution | arXiv |
| publishDate | 2015 |
| record_format | arxiv |
| spellingShingle | Enhanced transport length of spin-helical Dirac fermions in disordered 3D topological insulators Dufouleur, J. Veyrat, L. Dassonneville, B. Nowka, C. Hampel, S. Leksin, P. Eichler, B. Schmidt, O. G. Büchner, B. Giraud, R. Mesoscale and Nanoscale Physics 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 that the anisotropic scattering of spin-helical Dirac fermions results in a strong enhancement of $l_\textrm{tr}$, which confirms theoretical predictions \cite{Culcer2010}. Despite strong disorder ($l_\textrm{e}\approx30$~nm), our result further points to the long-range nature of the scattering potential, giving a large ratio $l_\textrm{tr}/l_\textrm{e}\approx8$ 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. |
| title | Enhanced transport length of spin-helical Dirac fermions in disordered 3D topological insulators |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/1512.04439 |