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Electrical controllable spin pump based on a zigzag silicene nanoribbon junction.

Lin Zhang^1,2, Peiqing Tong^1,3

¹Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|November 3, 2017

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Researchers developed an electrically controllable spin pump using silicene nanoribbons. This device generates spin-up and spin-down currents without external bias, offering tunable spin-polarized electron manipulation.

Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Silicene nanoribbons offer unique electronic properties due to their graphene-like structure.
Spintronics aims to utilize electron spin for advanced electronic devices.
Controlling spin currents electrically is crucial for energy-efficient spintronics.

Purpose of the Study:

To propose and theoretically investigate an electrically controllable spin pump.
To explore the generation of spin-polarized currents in a silicene nanoribbon ferromagnetic junction.
To analyze the influence of electric fields and system parameters on spin pumping.

Main Methods:

Utilizing the Keldysh Green's function method.
Deriving analytic expressions for spin-resolved currents under adiabatic approximation.

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Investigating photon-assisted spin pump effects and electrically modulated band structures.

Main Results:

Demonstrated asymmetric spin-up and spin-down currents generated without external bias.
Identified interplay between photon-assisted spin pumping and modulated energy bands.
Showcased tunable spin valve phenomena dependent on energy gaps and system parameters (frequency, phase, spin-orbit coupling, Fermi level).

Conclusions:

The proposed silicene nanoribbon junction acts as an efficient electrical spin pump.
Tunable spin currents, pure spin currents, and 100% polarized spin currents are achievable.
Provides a pathway for electrical manipulation of spin-polarized electrons in graphene-like devices.