论文标题
强烈的激子 - 埃维素耦合引起的极化和辐射强度的崩溃和复兴
Collapses and revivals of polarization and radiation intensity induced by strong exciton-vibron coupling
论文作者
论文摘要
最近，电子自由度和振动程度之间具有强耦合的系统引起了人们的极大关注。在这项工作中，我们考虑了由外部单色场驱动的强耦合颤音和激子组成的系统的瞬态动力学。我们表明，在相干泵送下，激子的极化表现出复杂的量子动力学，可以分为三个阶段。在第一阶段，由于向弧菌的转移状态过渡，其特征频率放松处的激子振荡放松。我们证明，这些转变的Fock国家在激发的激动人心的状态中起着有效的储层的作用。放松到该储层的时间取决于激子 - 泛元耦合。在第二阶段，在第一阶段转移到振动转移状态的储层中，出现了电子自由度和振荡的电子程度。因此，分子极化的动力学表现出崩溃和复兴。在最后阶段，这些崩溃和复兴会消散，极化在外场的频率下表现出瑞利的响应。发现的崩溃和复兴在辐射光谱中表现为频谱在激子过渡频率附近的多重分裂。
Recently, systems with strong coupling between electronic and vibrational degrees of freedom attract a great attention. In this work, we consider the transient dynamics of the system consisting of strongly coupled vibron and exciton driven by external monochromatic field. We show that under coherent pumping, polarization of exciton exhibits complex quantum dynamics which can be divided into three stages. At the first stage, exciton oscillations at its eigenfrequency relax due to the transition to set of shifted Fock states of vibrons. We demonstrate that these shifted Fock states play the role of an effective reservoir for the excited exciton state. The time of relaxation to this reservoir depends on exciton-vibron coupling. At the second stage, excitation, transferred to the reservoir of the vibronic shifted states at the first stage, returns into electronic degrees of freedom and revival of oscillations at exciton eigenfrequency appears. Thus, the dynamics of molecular polarization exhibit collapses and revivals. At the final stage, these collapses and revivals dissipate and polarization exhibits Rayleigh response at the frequency of the external field. Discovered collapses and revivals manifest in radiation spectrum as multiple splitting of the spectral line near the exciton transition frequency.
