| 温度对激光场引起的纳米管声子增益影响 |
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| 引用本文： | 冯澎,易泰民.温度对激光场引起的纳米管声子增益影响[J].北京科技大学学报,2007,29(10):1031-1032,1040. |
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| 作者姓名： | 冯澎 易泰民 |
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| 作者单位： | 1. 北京科技大学应用科学学院,北京,100083;中国高等科学技术中心,北京,100080
2. 北京科技大学应用科学学院,北京,100083 |
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| 摘 要： | 讨论了强激光场下单壁纳米管的声子增益效应. 采用含时微扰方法计算了不同温度下声子占据数随时间的变化率(声子增益系数). 计算结果表明,在强激光场下纳米管中的声子占据数随时间非线性增加,增益系数与温度和激光场强都有关系. 随着温度升高,声子增益系数迅速减小;在确定的温度情况下,激光场强越强,声子增益效应越明显,并对这个现象给出了合理的物理解释.
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| 关 键 词： | 单壁纳米管 声子 增益 声子占据数 温度升高 强激光场 单壁纳米管 声子 增益系数 影响 nanotube amplification phonon temperature 物理解释 现象 情况 关系 场强 非线性 结果 变化率 时间 计算 |
| 修稿时间： | 2006-05-102007-02-12 |
Effect of temperature on phonon amplification in a single-walled nanotube |
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| FENG Peng,YI Taimin.Effect of temperature on phonon amplification in a single-walled nanotube[J].Journal of University of Science and Technology Beijing,2007,29(10):1031-1032,1040. |
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| Authors: | FENG Peng YI Taimin |
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| Institution: | 1. Applied Science School, University of Science and Technology Beijing, Beijing 100083, China;2. China Center of Advanced Science and Technology, Beijing 100080, China |
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| Abstract: | The phonon amplification effect occurring in a single-walled nanotube was discussed,and the change rates of phonon population at different temperatures were calculated by using a time-dependent-perturbation method.It is shown that the optical phonon population increases nonlinearly with increasing laser field and the rate decreases as the temperature increases.At a definite temperature,the more intense the laser field is,the more remarkable the phonon amplification effect is,and a reasonable interpretation on this phenomenon was presented. |
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| Keywords: | single-walled nanotube phonon amplification phonon population |
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