Fano interference with the alternating asymmetry parameter in time-domain experiments
Fano interference with the alternating asymmetry parameter in time-domain experiments
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DOI：
10.1134/1.2142870
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发表时间：
2005-10
期刊：
影响因子：
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通讯作者：
O. Misochko;M. Hase;K. Ishioka;M. Kitajima
中科院分区：
文献类型：
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作者：
O. Misochko;M. Hase;K. Ishioka;M. Kitajima
研究发现，超短激光脉冲在氦温下激发铋单晶后产生的时域反射信号在晶格和电荷自由度之间存在相互作用的情况下表现出法诺干涉。这一特性体现在傅里叶变换信号的特征谱线形状中，其不对称参数是泵浦脉冲和探测脉冲之间的延迟时间 τ 的周期函数。最有趣的性质是当 τ 变化时，不对称参数的符号发生变化，这表明时间反演对称性被打破。讨论了首次观察到的影响的各种可能原因。
It has been found that the time-domain reflection signal arising after the excitation of a bismuth single crystal at helium temperature by an ultrashort laser pulse exhibits Fano interference in the presence of the interaction between the lattice and charge degrees of freedom. This property is manifested in the characteristic spectral lineshape of the Fourier-transformed signal, whose asymmetry parameter is a periodic function of the delay time τ between the pumping and probing pulses. The most interesting property is the change of the sign of the asymmetry parameter when τ varies, which indicates that time reversal symmetry is broken. Various possible causes of the effect, observed for the first time, are discussed.