School of Science, Zhejiang University of Science and Technology, Hangzhou 310023, People's Republic of China.
J Phys Condens Matter. 2013 Apr 17;25(15):155304. doi: 10.1088/0953-8984/25/15/155304. Epub 2013 Mar 25.
We study spin-resolved noise in Coulomb blockaded double quantum dots coupled to ferromagnetic electrodes. The modulation of the interdot coupling and spin polarization in the electrodes gives rise to an intriguing dynamical spin ↑-↑ (↓-↓) blockade mechanism: bunching of up (down) spins due to dynamical blockade of an up (down) spin. In contrast to the conventional dynamical spin ↑-↓ bunching (bunching of up spins associated with a dynamical blockade of a down spin), this new bunching behavior is found to be intimately associated with the spin mutual-correlation, i.e. the noise fluctuation between opposite spin currents. We further demonstrate that the dynamical spin ↑-↑ and ↑-↓ bunching of tunneling events may be coexistent in the regime of weak interdot coupling and low spin polarization.
我们研究了与铁磁电极耦合的库仑阻塞双量子点中的自旋分辨噪声。 介观耦合和电极中自旋极化的调制导致了一种有趣的动态自旋↑-↑（↓-↓）阻塞机制：由于动态阻塞一个上（下）自旋，上（下）自旋的聚集。 与传统的动态自旋↑-↓聚集（与下自旋的动态阻塞相关的上自旋的聚集）相反，这种新的聚集行为与自旋相关性密切相关，即相反自旋电流之间的噪声波动。 我们进一步证明，在弱介观耦合和低自旋极化的情况下，隧道事件的动态自旋↑-↑和↑-↓聚集可能同时存在。
