Landau-Zener interference at bichromatic driving
Landau-Zener interference at bichromatic driving
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DOI：
10.1103/physrevb.92.245422
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发表时间：
2015-12-15
影响因子：
3.7
通讯作者：
Kohler, Sigmund
中科院分区：
文献类型：
--
作者：
Forster, Florian;Muehlbacher, Max;Kohler, Sigmund
我们从实验和理论上研究了由于外加交流场而反复穿越的避交处的干扰。我们的模型系统是一个电荷量子位在串联双量子点连接到两个引线。我们的重点是两个不同频率的同时驱动所造成的影响。我们研究了驱动频率的可通约性如何影响实空间和傅里叶空间中干涉图案的对称性。对于可通约频率，对称性敏感地依赖于两模态之间的相对相位，而对于不可通约频率，单色驱动的对称性总是恢复。
We investigate experimentally and theoretically the interference at avoided crossings which are repeatedly traversed as a consequence of an applied ac field. Our model system is a charge qubit in a serial double quantum dot connected to two leads. Our focus lies on effects caused by simultaneous driving with two different frequencies. We work out how the commensurability of the driving frequencies affects the symmetry of the interference patterns both in real space and in Fourier space. For commensurable frequencies, the symmetry depends sensitively on the relative phase between the two modes, whereas for incommensurable frequencies the symmetry of monochromatic driving is always recovered.