Geometrical spin manipulation in Dirac flakes
We investigate numerically the spin properties of electrons in flakes made of materials described by the Dirac equation, in the presence of intrinsic spin-orbit coupling (SOC). We show that electrons flowing along the borders of flakes via edge states become helically spin-polarized for strong SOC,...
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| Veröffentlicht in: | Journal of physics. Condensed matter 2016-02, Vol.28 (4), p.045305-045305 |
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| container_title | Journal of physics. Condensed matter |
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| creator | Kleftogiannis, Ioannis Amanatidis, Ilias |
| description | We investigate numerically the spin properties of electrons in flakes made of materials described by the Dirac equation, in the presence of intrinsic spin-orbit coupling (SOC). We show that electrons flowing along the borders of flakes via edge states become helically spin-polarized for strong SOC, for materials with and without a gap at the Fermi energy, corresponding to the massive and massless Dirac equation respectively. The helically spin-polarized electrons create spin-resolved transport, controlled by the flake's geometry in a multi-terminal device setup. A simple analytical model containing the basic ingredients of the problem is introduced to get an insight into the helical mechanism, along with our numerical results which are based on an effective tight-binding model. |
| doi_str_mv | 10.1088/0953-8984/28/4/045305 |
| format | Article |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Borders Condensed matter Dirac equation Dirac materials edge states Fermi surfaces Flakes Helical Mathematical analysis Mathematical models quantum transport spin-orbit coupling |
| title | Geometrical spin manipulation in Dirac flakes |
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