Institut für Theoretische Physik, Technische Universität Berlin, Germany.
Phys Rev Lett. 2012 Aug 3;109(5):054301. doi: 10.1103/PhysRevLett.109.054301. Epub 2012 Jul 31.
We present a microscopically based scheme for the generation of coherent cavity phonons (phonon laser) by an optically driven semiconductor quantum dot coupled to a THz acoustic nanocavity. External laser pump light on an anti-Stokes resonance creates an effective Lambda system within a two-level dot that leads to coherent phonon statistics. We use an inductive equation of motion method to estimate a realistic parameter range for an experimental realization of such phonon lasers. This scheme for the creation of nonequilibrium phonons is robust with respect to radiative and phononic damping and only requires optical Rabi frequencies of the order of the electron-phonon coupling strength.
我们提出了一种基于显微镜的方案，通过光驱动的半导体量子点与太赫兹声学纳米腔耦合来产生相干腔声子（声子激光）。在反斯托克斯共振上的外部激光泵浦光在两能级点内创建一个有效的 Lambda 系统，从而导致相干声子统计。我们使用感应运动方程方法来估计这种声子激光实验实现的现实参数范围。这种创建非平衡声子的方案对辐射和声子阻尼具有鲁棒性，并且只需要光拉比频率与电子-声子耦合强度的数量级相当。
