Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, 444-8585, Japan.
Faraday Discuss. 2011;153:375-82; discussion 395-413. doi: 10.1039/c1fd00070e.
The coherent phonons of YBa2Cu3O7-delta are believed to be strongly coupled to its superconductivity. Controlling the phonons below its transition temperature, therefore, may serve as a promising scheme of the control of superconductivity. Here we demonstrate optical manipulation of the Ba-O and Cu-O vibrations in a thin-film YBa2Cu3O7-delta below its transition temperature using a pair of femtosecond laser pulses. The interpulse delay is tuned to integral and half-integral multiples of the oscillation period of a specific phonon mode (Ba-O or Cu-O vibration) to enhance and suppress its amplitude, respectively.
据信，YBa2Cu3O7-δ 的相干声子与其超导性密切相关。因此，控制其相变温度以下的声子可能成为控制超导性的一种很有前途的方案。在这里，我们使用一对飞秒激光脉冲演示了在薄膜 YBa2Cu3O7-δ 相变温度以下对 Ba-O 和 Cu-O 振动的光学操控。通过调节两脉冲之间的延时，使其分别成为特定声子模式（Ba-O 或 Cu-O 振动）的振动周期的整数和半整数倍，从而分别增强和抑制其振幅。
