Departamento de Física, FCEyN, UBA and IFIBA, Conicet, Pabellón I, Ciudad Universitaria, 1428 Buenos Aires, Argentina.
Phys Rev Lett. 2013 May 24;110(21):217401. doi: 10.1103/PhysRevLett.110.217401. Epub 2013 May 21.
We study the crucial role played by the solid-state environment in determining the photon emission characteristics of a driven quantum dot. For resonant driving, we predict a phonon enhancement of the coherently emitted radiation field with increasing driving strength, in stark contrast to the conventional expectation of a rapidly decreasing fraction of coherent emission with stronger driving. This surprising behavior results from thermalization of the dot with respect to the phonon bath and leads to a nonstandard regime of resonance fluorescence in which significant coherent scattering and the Mollow triplet coexist. Off resonance, we show that despite the phonon influence, narrowing of dot spectral sideband widths can occur in certain regimes, consistent with an experimental trend.
我们研究了固态环境在确定驱动量子点光子发射特性方面所起的关键作用。对于共振驱动，我们预测随着驱动强度的增加，相干发射辐射场会增强声子，这与传统的预期形成鲜明对比，即随着驱动强度的增加，相干发射的比例会迅速下降。这种令人惊讶的行为是由于量子点相对于声子浴的热化引起的，导致了非标准的共振荧光 regime，其中显著的相干散射和 Mollow 三重线共存。在非共振情况下，我们表明尽管存在声子影响，但在某些 regime 中，仍可能出现量子点光谱旁带宽度变窄的情况，这与实验趋势一致。
