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Exciton lifetimes of CdTe nanocrystal quantum dots in high magnetic fields

机译:CdTe纳米晶体量子点在高磁场中的激子寿命

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摘要

We have measured the low-temperature (4.2 K) exciton lifetimes of zinc-blende CdTe nanocrystal quantum dots (NQDs), 2.6-3.8 nm in diameter, in magnetic fields up to 30 T. The exciton photoluminescence decay time decreases with both dot size and magnetic field. We explain the decrease in decay time in magnetic fields by the mixing of bright and dark exciton states due to a small shape asymmetry in the zinc-blende CdTe NQDs. We show that this behavior resembles that of wurtzite CdSe NQDs, and we demonstrate that an asymmetry of NQDs caused by either shape or crystal structure leads to similar exciton decay dynamics.
机译:我们已经测量了直径高达2.6-3.8 nm的掺锌CdTe锌纳米晶量子点(NQDs)在高达30 T的磁场中的低温(4.2 K)激子寿命。两种尺寸的激子的光致发光衰减时间均减小和磁场。我们解释了由于混合明亮的CdTe NQD中的形状不对称而导致的明亮和黑暗激子状态混合导致的磁场衰减时间的减少。我们表明这种行为类似于纤锌矿CdSe NQD的行为,并且我们证明了由形状或晶体结构引起的NQD不对称导致相似的激子衰减动力学。

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  • 来源
    《Physical review》 |2011年第3期|p.035304.1-035304.5|共5页
  • 作者单位

    Radboud University Nijmegen, Institute for Molecules and Materials, High Field Magnet Laboratory, NL-6525 ED Nijmegen,The Netherlands;

    Radboud University Nijmegen, Institute for Molecules and Materials, NL-6525 ED Nijmegen, The Netherlands;

    Radboud University Nijmegen, Institute for Molecules and Materials, High Field Magnet Laboratory, NL-6525 ED Nijmegen,The Netherlands;

    Debye Institute, Condensed Matter and Interfaces, Utrecht University, P.O. Box 80 000, NL-3508 TA Utrecht, The Netherlands;

    Debye Institute, Condensed Matter and Interfaces, Utrecht University, P.O. Box 80 000, NL-3508 TA Utrecht, The Netherlands;

    Debye Institute, Condensed Matter and Interfaces, Utrecht University, P.O. Box 80 000, NL-3508 TA Utrecht, The Netherlands;

    Debye Institute, Condensed Matter and Interfaces, Utrecht University, P.O. Box 80 000, NL-3508 TA Utrecht, The Netherlands;

    Radboud University Nijmegen, Institute for Molecules and Materials, High Field Magnet Laboratory, NL-6525 ED Nijmegen,The Netherlands;

    Radboud University Nijmegen, Institute for Molecules and Materials, High Field Magnet Laboratory, NL-6525 ED Nijmegen,The Netherlands;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum dots; excitons and related phenomena;

    机译:量子点;激子及相关现象;

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