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Transport blocking and topological phases using ac magnetic fields

机译:使用交流磁场的传输阻塞和拓扑相位

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We analyze electron dynamics and topological properties of open double quantum dots driven by circularly polarized ac magnetic fields. In particular we focus on the system symmetries which can be tuned by the ac magnetic field. Remarkably, we show that in the electron spin resonance configuration, where the magnetic fields in each dot oscillate with a phase difference of π, charge localization occurs giving rise to transport blocking at arbitrary intensities of the ac field. The conditions for charge localization are obtained by means of Floquet theory and related with quasi-energies degeneracy. We also demonstrate that a topological phase transition can be induced in the adiabatic regime for a phase difference of π, either by tuning the coupling between dots or by modifying the intensity of the driving magnetic field.
机译:我们分析了由圆极化交流磁场驱动的开放双量子点的电子动力学和拓扑性质。特别是,我们专注于可以通过交流磁场调节的系统对称性。值得注意的是,我们显示出在电子自旋共振配置中,每个点中的磁场以π的相位差振荡,电荷的局域性发生,从而在交流电场的任意强度下引起传输阻塞。电荷定位的条件是通过Floquet理论获得的,并且与准能量简并性有关。我们还证明,可以通过调整点之间的耦合或修改驱动磁场的强度,在绝热状态下针对π的相位差诱导拓扑相变。

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