Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-03-24
Phys. Rev. B 75, 155326 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
RevTex, 9 pages, 5 figures
Scientific paper
10.1103/PhysRevB.75.155326
We have numerically solved the Hamiltonian of an electron in a semiconductor double ring subjected to the magnetic flux and Rashba spin-orbit interaction. It is found that the Aharonov-Bohm energy spectrum reveals multi-zigzag periodic structures. The investigations of spin-dependent electron dynamics via Rabi oscillations in two-level and three-level systems demonstrate the possibility of manipulating quantum states. Our results show that the optimal control of photon-assisted inter-ring transitions can be achieved by employing cascade-type and $\Lambda$-type transition mechanisms. Under chirped pulse impulsions, a robust and complete transfer of an electron to the final state is shown to coincide with the estimation of the Landau-Zener formula.
Chang Cheng-Hung
Kuan Wen-Hsuan
Tang Chi-Shung
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