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Paper detail

Back-action Driven Electron Spin Singlet-Triplet Excitation in a GaAs Quantum Dot

In a single quantum dot (QD), the electrons were driven out of thermal equilibrium by the back-action from a nearby quantum point contact (QPC). We found the driving to energy excited states can be probed with the random telegraph signal (RTS) statistics, when the excited states relax slowly compared with RTS tunneling rate. We studied the last few electrons, and found back-action driven spin singlet-triplet (S-T) excitation for and only for all the even number of electrons. We developed a phenomenological model to quantitatively characterize the spin S-T excitation rate, which enabled us to evaluate the influence of back-action on spin S-T based qubit operations.

preprint2011arXivOpen access
Gang CaoMing XiaoHaiou LiCheng ZhouRunan ShangTao TuGuangcan GuoGuoping GuoHongWen Jiang
cond-mat.mes-hall
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Gang CaoMing XiaoHaiou LiCheng ZhouRunan ShangTao TuGuangcan GuoGuoping GuoHongWen Jiang

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