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用超宽带和强烈的太赫兹脉冲的量子物理
Quantum Physics with Ultrabroadband and Intense Terahertz Pulses |
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| 课程网址: |
http://videolectures.net/kolokviji_leitenstorfer_qpitp/
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| 主讲教师: |
Alfred Leitenstorfer
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| 开课单位: |
康斯坦茨大学
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| 开课时间: |
2010-10-10
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| 课程语种: |
英语
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| 中文简介: |
半导体纳米结构中的声子、激子、磁子或能量间隙等低能基本激励以及强相关材料对于固态物理学具有重要意义。1 thz 和 100 thz 之间的频率窗口包括这些共振的大部分。在过去的几年里, 超宽带太赫兹光谱域中的锁相光脉冲已经发展成为一个强大的工具, 可以通过光场的振幅和次循环时间尺度直接探测这些激发。强多 thz 源产生峰值电场和磁场的最新进展, 分别高达 108 mvcm 和 30 t, 现在已经促进了从仅仅观测到通过强的 thz 对低能动力学的相干控制的重要一步瞬 变。在介绍了这一技术之后, 介绍了超宽带和非线性 thz 对复杂材料研究的典型例子, 以及迈向量子光学新领域的初步步骤: 电子和晶格自由度的子周期分析在 vo2 和 yba2cu3o7-δ 电子激发后, 通过磁场分量和非绝热的 thz 量子光学控制超强耦合状态下的光物质相互作用, 在 nio 中进行自旋波的相干开关。
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| 课程简介: |
Low-energy elementary excitations such as phonons, excitons, magnons or energy gaps insemiconductor nanostructures and strongly correlated materials are of central importance for solid-state physics. The frequency window between 1 THz and 100 THz comprises most of these resonances. Over the last years, phase-locked light pulses in the ultrabroadband terahertz spectral domain have evolved into a powerful tool for probing these excitations directly via the amplitude of the light field and on a sub-cycle time scale. Latest advances of intense multi-THz sources generating peak electric and magnetic fields as high as 108 MV/cm and 30 T, respectively, have now facilitated the important step from mere observation to coherent control of low-energy dynamics by intense THz transients. After an introduction to the technology, typical examples of ultrabroadband and nonlinear THz studies on complex materials, as well as first steps towards new areas of quantum optics are presented: Sub-cycle analysis of electronic and lattice degrees of freedom after electronic excitation of VO2 and YBa2Cu3O7-δ, coherent switching of spin waves in NiO via the magnetic field component and non-adiabatic THz quantum optics controlling light-matter interaction in the ultrastrong coupling regime.
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| 关 键 词: |
磁振子; 峰值电场和磁场; 量子光学
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| 课程来源: |
视频讲座网
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| 最后编审: |
2020-06-04：张荧(课程编辑志愿者)
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| 阅读次数: |
53
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