Perfect Spin Filter by Periodic Drive of a Ferromagnetic Quantum Barrier.
Phys Rev Lett
; 119(26): 267701, 2017 Dec 29.
Article
en En
| MEDLINE
| ID: mdl-29328722
ABSTRACT
We consider the problem of particle tunneling through a periodically driven ferromagnetic quantum barrier connected to two leads. The barrier is modeled by an impurity site representing a ferromagnetic layer or a quantum dot in a tight-binding Hamiltonian with a local magnetic field and an ac-driven potential, which is solved using the Floquet formalism. The repulsive interactions in the quantum barrier are also taken into account. Our results show that the time-periodic potential causes sharp resonances of perfect transmission and reflection, which can be tuned by the frequency, the driving strength, and the magnetic field. We demonstrate that a device based on this configuration could act as a highly tunable spin valve for spintronic applications.
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MEDLINE
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Phys Rev Lett
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2017
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Article
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Chile