Pieczarka Maciej, Syperek Marcin, Dusanowski Łukasz, Misiewicz Jan, Langer Fabian, Forchel Alfred, Kamp Martin, Schneider Christian, Höfling Sven, Kavokin Alexey, Sęk Grzegorz
Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.
Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems (RCCM), Am Hubland, D-97074 Würzburg, Germany.
Phys Rev Lett. 2015 Oct 30;115(18):186401. doi: 10.1103/PhysRevLett.115.186401. Epub 2015 Oct 26.
An expanding polariton condensate is investigated under pulsed nonresonant excitation with a small laser pump spot. Far above the condensation threshold we observe a pronounced increase in the dispersion curvature, with a subsequent linearization of the spectrum and strong luminescence from a ghost branch orthogonally polarized with respect to the linearly polarized condensate emission. Polarization of both branches is understood in terms of spin-dependent polariton-polariton scattering. The presence of the ghost branch has been confirmed in time-resolved measurements. The effects of disorder and dissipation in the photoluminescence of polariton condensates and their excitations are discussed.
在具有小激光泵浦光斑的脉冲非共振激发下，对膨胀的极化激元凝聚体进行了研究。在远高于凝聚阈值的情况下，我们观察到色散曲率显著增加，随后光谱线性化，并且从与线性极化凝聚体发射正交极化的鬼分支发出强烈的发光。两个分支的极化可以通过自旋相关的极化激元 - 极化激元散射来理解。鬼分支的存在已在时间分辨测量中得到证实。讨论了无序和耗散对极化激元凝聚体及其激发的光致发光的影响。
