Femtosecond near‐field spectroscopy: carrier relaxation and transport in single quantum wires
Femtosecond near‐field spectroscopy: carrier relaxation and transport in single quantum wires
复制标题
飞秒近场光谱：单量子线中的载流子弛豫和传输
作者：
Valentina Emiliani;T. Guenther;Christoph Lienau;R. Nötzel;K. H. Ploog
准双色飞秒泵浦和探测光谱与近场扫描光学显微镜相结合，研究单个半导体纳米结构中的载流子动力学。在具有200 fs的时间分辨率和200 nm的空间分辨率的时间、光谱和空间分辨测量中，单个量子线的反射率的非线性变化被映射到真实的空间和时间中。 实验表明，载流子弛豫成一个单一的量子线发生在100 fs的时间尺度在室温下。 给出了一个瞬态单极电子传输沿着线轴上的皮秒时间和100 nm的长度尺度的证据。
Quasi‐two‐colour femtosecond pump and probe spectroscopy and near‐field scanning optical microscopy are combined to study the carrier dynamics in single semiconductor nanostructures. In temporally, spectrally and spatially resolved measurements with a time resolution of 200 fs and a spatial resolution of 200 nm, the non‐linear change in reflectivity of a single quantum wire is mapped in real space and time. The experiments show that carrier relaxation into a single quantum wire occurs on a 100 fs time scale at room temperature. Evidence is given for a transient unipolar electron transport along the wire axis on a picosecond time and 100 nm length scale.