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arXiv · 2004.11043

Carrier Drift Control of Spin Currents in Graphene-Based Spin-Current Demultiplexers

J. Ingla-Aynés·A A. Kaverzin·B. J. van Wees
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Abstract

Electrical control of spin transport is promising for achieving new device functionalities. Here we calculate the propagation of spin currents in a graphene-based spin-current demultiplexer under the effect of drift currents. We show that, using spin- and charge-transport parameters already obtained in experiments, the spin currents can be guided in a controlled way. In particular, spin-current selectivities up to 102 can be achieved for measurements over a distance of 10{\mu}m under a moderate drift current density of 20{\mu}A/{\mu}m, meaning that the spin current in the arm that is off is only 1% of the current in the arm that is on. To illustrate the versatility of this approach, we show similar efficiencies in a device with four outputs and the possibility of multiplexer operation using spin drift. Finally, we explain how the effect can be optimized in graphene and two-dimensional semiconductors.

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J. Ingla-Aynés, A A. Kaverzin, B. J. van Wees. 2020-04-23. Carrier Drift Control of Spin Currents in Graphene-Based Spin-Current Demultiplexers. https://doi.org/10.1103/physrevapplied.10.044073

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