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A controllable spin prism.

¹Department of Physics, Bilkent University, 06800 Ankara, Turkey. UNAM Material Science and Nanotechnology Institute, Bilkent University, 06800 Ankara, Turkey.

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

|August 5, 2011

Summary

This study introduces a controllable spin prism device using quantum wells. It manipulates spin-orbit interactions for applications in spintronics, analogous to optical prisms.

Area of Science:

Spintronics
Quantum mechanics
Condensed matter physics

Background:

Spin-orbit interactions, specifically Rashba and Dresselhaus couplings, are fundamental in spintronics.
Controlling these interactions is key to developing novel spin-based devices.
Existing methods for spin manipulation are limited, motivating research into new approaches.

Purpose of the Study:

To propose and theoretically investigate a novel device acting as a controllable spin prism.
To explore the manipulation of Rashba and Dresselhaus spin-orbit interactions via external gate potentials and electric fields.
To demonstrate the potential for spin-dependent filtering and conversion functionalities.

Main Methods:

Theoretical modeling of a large quantum well structure.

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Inclusion and external control of both Rashba and Dresselhaus spin-orbit interactions.

Calculation of spin-dependent transmission and reflection amplitudes by varying control parameters (gate potential, electric field, barrier height).

Main Results:

Demonstration of a device functioning as a controllable spin prism.
Achieved manipulation of destructive interference between Rashba and Dresselhaus couplings.
Identified distinct operational regimes for spin prism, converter, and filter functionalities.

Conclusions:

The proposed device offers a new paradigm for controlling spin currents in spintronics.
External manipulation of spin-orbit interactions enables versatile spin manipulation.
This work may inspire further research in spin-based devices, drawing parallels with linear optics.