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Electric field dependent Zeeman splitting of excitons in diluted two-dimensional electron systems

机译:稀疏二维电子系统中激子的电场依赖性塞曼分裂

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We investigate modulation-doped GaAs-AlGaAs quantum wells by photoluminescence spectroscopy. External gates allow us to tune the carrier densities below 10(11) cm(-2), where we observe a crossover from an extended two-dimensional electron system to a regime where negatively charged excitons start to appear. By applying an external magnetic field, we can clearly resolve singlet and triplet excitons and neutral excitons. We find that the Zeeman splittings of the singlet and neutral excitons depend characteristically on the applied magnetic and electric fields. While the Zeeman splitting of the singlet exciton at high magnetic fields is always positive, the splitting of the neutral exciton can be tuned from negative to positive values by the external electric field. [References: 16]
机译:我们通过光致发光光谱研究了调制掺杂的GaAs-AlGaAs量子阱。外部门控使我们能够将载流子密度调整到10(11)cm(-2)以下,在这里我们观察到了从扩展的二维电子系统到带负电荷的激子开始出现的状态的交叉。通过施加外部磁场,我们可以清楚地分辨单重态和三重态激子和中性激子。我们发现单重态激子和中性激子的塞曼分裂特征取决于所施加的磁场和电场。虽然在高磁场下单重态激子的塞曼分裂总是正的,但是中性激子的分裂可以通过外部电场从负值调整为正值。 [参考:16]

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