Spin resonance under topological driving fields
Spin resonance under topological driving fields
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DOI：
10.1088/1367-2630/aa723a
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发表时间：
2017-02
影响因子：
3.3
通讯作者：
A. Reynoso;J. P. Baltan'as;H. Saarikoski;J. Vázquez-Lozano;J. Nitta;D. Frustaglia
中科院分区：
文献类型：
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作者：
A. Reynoso;J. P. Baltan'as;H. Saarikoski;J. Vázquez-Lozano;J. Nitta;D. Frustaglia
我们研究了局域自旋-1/2在时间周期磁场驱动下的动力学，它经历了一个拓扑转变。尽管强烈的非绝热效应主导着自旋动力学，但我们发现，通过在准能量中出现有效的Berry相，场的拓扑结构似乎明显地印在了Floquet自旋态上。这对自旋共振条件产生了显著的影响，这暗示了一类全新的实验，以发现自旋和其他二能级系统动力学中的拓扑转变，从核磁共振到强驱动的超导量子比特。
We study the dynamics of a localized spin-1/2 driven by a time-periodic magnetic field that undergoes a topological transition. Despite the strongly non-adiabatic effects dominating the spin dynamics, we find that the field’s topology appears clearly imprinted in the Floquet spin states through an effective Berry phase emerging in the quasienergy. This has remarkable consequences on the spin resonance condition suggesting a whole new class of experiments to spot topological transitions in the dynamics of spins and other two-level systems, from nuclear magnetic resonance to strongly-driven superconducting qubits.