Strain effect on spin polarization in a graphene junction
We investigate the strain effect on the spin-dependent transport in a graphene junction with spin-orbit coupling and a gate voltage. We find that uniaxial strain along the armchair direction breaks the transmission probability symmetry with respect to the incident angle, reduces the spin-flipped tra...
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Veröffentlicht in: | Journal of physics. D, Applied physics Applied physics, 2017-04, Vol.50 (13), p.135302 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We investigate the strain effect on the spin-dependent transport in a graphene junction with spin-orbit coupling and a gate voltage. We find that uniaxial strain along the armchair direction breaks the transmission probability symmetry with respect to the incident angle, reduces the spin-flipped transmission probability, and extends the transmission gap as regard to the Fermi energy, while strain along the zig-zag direction has very little effect on transmission probabilities. We analyze the spin polarization as a function of the strain magnitude, direction, voltage, and area width. Selecting the proper strain direction and magnitude for both the Klein tunneling and classical cases, the direction of the spin-polarization vector can be controlled and its magnitude is dramatically enhanced. Strain will expand the non-zero range of the magnitude of the spin-polarization vector with respect to voltage. Increasing the strain area width over a threshold, keeps the magnitude of the spin-polarization vector stable. |
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ISSN: | 0022-3727 1361-6463 |
DOI: | 10.1088/1361-6463/aa5cf4 |