Intrinsic oscillations of spin current polarization in a paramagnetic resonant tunneling diode

Abstract

A spin- and time-dependent electron transport has been studied in a paramagnetic resonant tunneling diode using the self-consistent Wigner-Poisson method. Based on the calculated current-voltage characteristics in an external magnetic field we have demonstrated that under a constant bias both the spin-up and spin-down current components exhibit the THz oscillations in two different bias voltage regimes. We have shown that the oscillations of the spin-up (down) polarized current result from the coupling between the two resonance states: one localized in the triangular quantum well created in the emitter region and the second localized in the main quantum well. We have also elaborated the one-electron model of the current oscillations, which confirms the results obtained with the Wigner-Poisson method. The spin current oscillations can lower the effectiveness of spin filters based on the paramagnetic resonant tunneling structures and can be used to design the generators of the spin polarized current THz oscillations that can operate under the steady bias and constant magnetic field.

11 pages, 8 figures, to be published in Phys.Rev.B

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Cited by in corpus (6)

• Dissipative transport in superlattices within the Wigner function formalism
• Spin transistor operation driven by the Rashba spin-orbit coupling in the gated nanowire
• Coherent spin transport through helical edge states of topological insulator
• Spin filter effect at room temperature in GaN/GaMnN ferromagnetic resonant tunneling diode
• Spin filtering effect generated by the inter-subband spin-orbit coupling in the bilayer nanowire with the quantum point contact
• Transition from positive to negative magnetoresistance induced by a constriction in semiconductor nanowire