Excitation of a breather mode of bound soliton pairs in trans-polyacetylene by sub-five-femtosecond optical pulses -: art. no. 027401
Excitation of a breather mode of bound soliton pairs in trans-polyacetylene by sub-five-femtosecond optical pulses -: art. no. 027401
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DOI：
10.1103/physrevlett.89.027401
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发表时间：
2002-07-08
影响因子：
8.6
通讯作者：
Kobayashi, T
中科院分区：
文献类型：
--
作者：
Adachi, S;Kobryanskii, VM;Kobayashi, T
简并基态的反式聚乙炔在光激发后，由于电子-声子的耦合作用，产生非线性的孤子激发。激发态电子-空穴对在孤子对产生过程中的过剩能量引起了呼吸振荡，其特征在于碳-碳键的集体伸缩振动。对泵浦探针信号的时频分析表明，激发后伸缩模的瞬时频率被调制了约50 fs，调制周期为44 ± 3 fs，与理论预期一致，证实了呼吸子的存在。
Trans-polyacetylene with a degenerate ground state has a nonlinear excitation of soliton after photoexcitation, due to the electron-phonon coupling. The excess energy of an excited electron-hole pair over a soliton pair creation induces a breather oscillation characterized by collective stretching vibration of the carbon-carbon bonds. A time-frequency analysis of pump probe signal shows that instantaneous frequencies of stretching modes are modulated for similar to50 fs after excitation and the modulation period is 44 +/- 3 fs consistent with the theoretical expectation, clearly verifying the breather.