Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Pumped double quantum dot with spin-orbit coupling | Khomitsky and Sherman Nanoscale Research Letters 2011 6 212 http content 6 1 212 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Pumped double quantum dot with spin-orbit coupling Denis Khomitsky1 Eugene Sherman2 3 Abstract We study driven by an external electric field quantum orbital and spin dynamics of electron in a one-dimensional double quantum dot with spin-orbit coupling. Two types of external perturbation are considered a periodic field at the Zeeman frequency and a single half-period pulse. Spin-orbit coupling leads to a nontrivial evolution in the spin and orbital channels and to a strongly spin- dependent probability density distribution. Both the interdot tunneling and the driven motion contribute into the spin evolution. These results can be important for the design of the spin manipulation schemes in semiconductor nanostructures. PACS numbers Introduction Quantum dots being one of the most intensively studied examples of natural and artificial nanostructures attract attention due to the richness in the properties they demonstrate in the static and dynamic regimes 1 . A possible realization of qubits for quantum information processing can be done by using spins of electrons in semiconductor quantum dots 2 . Spin- orbit coupling makes the dynamics even in the basic systems such as the single-electron quantum dots extremely rich both in the orbital and spin channels. If the frequency of the electric field driving the orbital motion matches the Zeeman resonance for electron spin in a magnetic field the spin-orbit coupling causes a spin flip. This effect was proposed in refs. 3 4 to manipulate the spin states by electric means. The efficiency of this process is much greater than that of the conventional application of a periodic resonant magnetic field. The ability to cause coherently the spin flip in GaAs quantum dots was demonstrated in ref. 5 where the gate-produced .
