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首页> 外文期刊>Physica status solidi, B. Basic research >Mechanism of terahertz emission from an asymmetric double quantum well
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Mechanism of terahertz emission from an asymmetric double quantum well

机译：非对称双量子阱中太赫兹发射的机理

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The science and technology of ultrashort-pulse lasers have enjoyed much exciting progress. The past decade has seen the achievement of pulses shorter than 10 fs. Time-resolved optical spectroscopy with femtosecond-pulse lasers can be used to examine the electronic and phonon dynamic processes and their interaction in semiconductors. An asymmetric double quantum well is a verb simple system, in which it is possible to study the interplay between quantum beating, tunneling and interactions with light and with the lattice. In this system it is possible to create a macroscopic, coherent superposition of two different conduction sub-bands by femtosecond intersub-band photoexcitation of sufficient bandwidth. The two excited eigenstates form a wave packet, and each of these components evolves at different rates leading to an oscillating electric dipole moment The dephasing time is mainly related to electron-electron interactions but elastic electron-LO phonon scattering also gives an important contribution to the dephasing process. A microscopic study of the polaron lifetime in each of the three, previously designed, states gives valuable in formation on the behavior of electrons in the coherent stage, while in the thermalization stage in the inelastic scattering coming from electronic transitions between the three states that is responsible for the decay of the terahertz radiation. The time evolution of populations is compared, within a classical phenomenological model, for scattering rates obtained under two different assumption. and it is found that the time evolution of the population is strongly dependent on these rates. [References: 10]
机译：超短脉冲激光器的科学技术取得了令人激动的进步。在过去的十年中，实现了短于10 fs的脉冲。飞秒脉冲激光的时间分辨光谱可以用来检查电子和声子的动态过程及其在半导体中的相互作用。非对称双量子阱是一个动词简单系统，在其中可以研究量子跳动，隧穿以及与光和晶格相互作用之间的相互作用。在该系统中，有可能通过足够带宽的飞秒子带间光激发来创建两个不同导带的宏观，相干叠加。这两个激发的本征态形成一个波包，并且每个这些分量以不同的速率演化，导致振荡的电偶极矩。移相时间主要与电子-电子相互作用有关，但是弹性电子-LO声子散射也为电子的相互作用做出了重要贡献。移相过程。对先前设计的三种状态中的每一个进行极化子寿命的微观研究，对相干阶段电子行为的形成具有重要的价值，而在热化阶段中，来自三种状态之间电子跃迁的非弹性散射即为负责太赫兹辐射的衰减。在经典现象学模型中，比较了人口的时间演化，以了解在两种不同假设下获得的散射率。并且发现人口的时间演变强烈依赖于这些比率。 [参考：10]

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