Observation of an amplitude collapse and revival of chirped coherent phonons in bismuth
Observation of an amplitude collapse and revival of chirped coherent phonons in bismuth
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DOI：
10.1103/physrevlett.92.197401
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发表时间：
2004-05-14
影响因子：
8.6
通讯作者：
Kitajima, M
中科院分区：
文献类型：
--
作者：
Misochko, OV;Hase, M;Kitajima, M
研究了高注量超短激光脉冲在铋中产生的A（1g）相干声子。我们观察到，非线性区，其中声子的振荡参数依赖于注量，由不同的动力学子区。在进入非线性区之后，声子变为啁啾。增加影响力进一步导致崩溃和复兴的出现，然后变成多次崩溃和复兴。这可以用非谐势中的波包动力学来解释，在非谐势中，波包周期性地分裂并以其原始形式重新组合，给出了令人信服的证据，表明声子处于量子态，没有经典模拟。
We have studied the A(1g) coherent phonons in bismuth generated by high fluence ultrashort laser pulses. We observed that the nonlinear regime, where the phonons' oscillation parameters depend on fluence, consists of subregimes with distinct dynamics. Just after entering the nonlinear regime, the phonons become chirped. Increasing the fluence further leads to the emergence of a collapse and revival, which next turns into multiple collapses and revivals. This is explained by the dynamics of a wave packet in an anharmonic potential, where the packet periodically breaks up and reconstitutes in its original form, giving convincing evidence that the phonons are in a quantum state, with no classical analog.