| 双激光位相差对石墨层中声子增益的影响 |
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| 引用本文： | 冯澎,李家节.双激光位相差对石墨层中声子增益的影响[J].北京科技大学学报,2007,29(11):1138-1140,1144. |
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| 作者姓名： | 冯澎 李家节 |
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| 作者单位： | 北京科技大学应用科学学院,北京,100083 |
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| 摘 要： | 通过修正的泛函积分方法研究两束激光对石墨层中原子位移涨落的影响.计算表明:在激光场强和频率一定的情况下,适当调节激光场的相位差,可以使原子位移涨落随时间的变化率在有限的时间范围内为正值,这对应声子增益的过程.详细讨论了产生这种声子增益效应的机理,给出了产生声子增益的时间间隔.
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| 关 键 词： | 原子位移涨落 激光场 光-电相互作用 电-声相互作用 激光场 位相差 石墨层 声子 增益 影响 amplification phonon fields laser dual phase difference 时间间隔 机理 效应 过程 对应 时间范围 有限 变化率 |
| 收稿时间： | 2006-08-24 |
| 修稿时间： | 2006-12-06 |
Effect of phase difference between dual laser fields on phonon amplification in a graphene |
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| FENG Peng,LI Jiajie.Effect of phase difference between dual laser fields on phonon amplification in a graphene[J].Journal of University of Science and Technology Beijing,2007,29(11):1138-1140,1144. |
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| Authors: | FENG Peng LI Jiajie |
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| Abstract: | Atomic displacement fluctuation in a graphene under dual laser fields was studied by a moatttea functional integral approach. It was shown that when the field strength and the frequency were fixed, the atomic displacement fluctuation was tuned by the phase difference between dual laser fields. It was realized that the rate of change of the atomic displacement fluctuation took its positive value in measurable time ranges. This corresponded to a phonon amplification effect. The mechanism of generating the phonon amplification was discussed. |
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| Keywords: | atomic displacement fluctuation laser field photon-electron interaction electron-phonon interaction |
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