Rashba coupling and spin switching through surface states of Dirac semimetals



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Baba, Yuriko Caterina and Domínguez-Adame Acosta, Francisco and Platero, Gloria and Molina, Rafael A. (2021) Rashba coupling and spin switching through surface states of Dirac semimetals. New journal of physics, 26 (2). ISSN 1367-2630

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Official URL: http://dx.doi.org/10.1088/1367-2630/abda56


We study the effect of the Rashba spin-orbit coupling on the Fermi arcs of topological Dirac semimetals. The Rashba coupling is induced by breaking the inversion symmetry at the surface. Remarkably, this coupling could be enhanced by the interaction with the substrate and controlled by an external electric field. We study analytically and numerically the rotation of the spin of the surface states as a function of the electron's momentum and the coupling strength. Furthermore, a detailed analysis of the spin-dependent two-terminal conductance is presented in the clean limit and with the addition of a random distribution of impurities. Depending on the magnitude of the quadratic terms in the Hamiltonian, the spin-flip conductance may become dominant, thus showing the potential of the system for spintronic applications, since the effect is robust even in the presence of disorder.

Item Type:Article
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©2021 IOP Publishing LTD
We acknowledge financial support through Spanish grants PGC2018-094180-B-I00 (MCIU/AEI/FEDER, EU), MAT2016-75955, MAT2017-86717-P and PID2019-106820RB-C21 (MINECO/FEDER, EU), CAM/FEDER Project No. S2018/TCS-4342 (QUITEMAD-CM) and CSIC Research Platform PTI-001. G P also acknowledges support from the DFG within SBF 1277 and from the 'UA: Matematica Aplicada a la Teoria de la Materia Condensada' with the Carlos III University.

Uncontrolled Keywords:Rashba coupling; Dirac semimetal; Spin switcher; Spintronics; Topological semimetals
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:64318
Deposited On:09 Apr 2021 16:50
Last Modified:12 Apr 2021 08:20

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