Floquet Scattering by Time-Periodic Potential in Double-Well with Spin–Orbit Coupling

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We investigate the transmission properties of a single electron tunneling through a double quantum-well structure taking both a time-periodic potential and Dresselhaus spin–orbit coupling (DSOC) into consideration by using the single-band effective mass approximation method, the Floquet theorem, and the transfer-matrix technique. Our numerical results show that some satellite resonant peaks appear in both the two sides of those field-free resonant peaks, owing to the photon-assisted transmission in the presence of the time-periodic potential. The applied bias potential will shift the transmission resonant peaks toward lower energy region and the spin degeneracy is eliminated when the DSOC is considered. The spin polarization can be controlled by tuning the in-plane wave vector and the applied electric field.
2010-06-25