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New perspectives on kinetics of excitons in Cu2O

机译：Cu2O中激子动力学的新观点

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Ortho-para conversion and Auger recombination of excitons in Cu2O are studied by time- and space-resolved luminescence. The interconversion between orthoexcitons and lower-lying paraexcitons is accurately measured at low excitation levels, where ortho and paraexcitons are in thermal equilibrium. Temperature- and stress-dependences of the interconversion rate D(T, Delta) imply that down-conversion occurs by TA phonon emission, which provides the needed rotation of the lattice to induce a spin flip. As the excitation level increases, excitons start to undergo a strong density-dependent Auger recombination. We report the measurements of the Auger constant A(T) over the temperature range 72-212 K. The measured Auger constant is found to depend roughly inversely with the exciton gas temperature over this range and its absolute magnitude is much larger than the present theoretical prediction. The large value of A and a 1/T-gas dependence imply that a thermodynamic BEC of excitons may be impossible to produce in this crystal. (c) 2004 Elsevier Ltd. All rights reserved.
机译：通过时间和空间分辨发光研究了Cu2O中激子的邻位对位转换和俄歇重组。在低激发水平下，正激子和低位副激子之间的相互转换可以精确测量，此时正激子和副激子处于热平衡状态。互转换率D（T，Delta）的温度和应力相关性意味着通过TA声子发射会发生下转换，从而提供晶格旋转所需的旋转以引发自旋翻转。随着激发水平的增加，激子开始经历强的密度依赖性俄歇复合。我们报告了在72-212 K的温度范围内对俄歇常数A（T）的测量。发现在该范围内，测得的俄歇常数与激子气体温度大致成反比，并且其绝对大小比当前理论值大得多。预测。较大的A值和1 / T-气体依赖性意味着在该晶体中可能无法产生激子的热力学BEC。 （c）2004 Elsevier Ltd.保留所有权利。

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