Spin relaxation in CdTe quantum dots

Spin relaxation in CdTe quantum dots
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DOI：
10.1103/physrevb.71.033314
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发表时间：
2005-01
期刊：
Physical Review B
影响因子：
3.7
通讯作者：
Ye Chen;T. Okuno;Y. Masumoto;Y. Terai;S. Kuroda;K. Takita
Ye Chen;T. Okuno;Y. Masumoto;Y. Terai;S. Kuroda;K. Takita
中科院分区：
物理与天体物理2区
文献类型：
--
作者：
Ye Chen;T. Okuno;Y. Masumoto;Y. Terai;S. Kuroda;K. Takita

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我们测量了CdTe量子点在高达10 T的纵向磁场下的光致发光谱和时间分辨光致发光谱。PL的圆极化随磁场的增加而增加，而在线极化激发下，PL的线极化保持为零。这种行为不能用激子的各向异性交换相互作用来解释。时间分辨的PL测量澄清了这种行为是由纵向磁场引起的自旋弛豫的抑制引起的。我们认为这与电子自旋与格核磁矩的超精细相互作用有关。
We have measured photoluminescence (PL) spectra and time-resolved PL in CdTe quantum dots under the longitudinal magnetic field up to 10 T. Circular polarization of PL increases with increasing magnetic field, while its linear polarization remains zero under linearly polarized excitation. This behavior cannot be explained by the anisotropic exchange interaction of excitons. Time-resolved PL measurements clarified that this behavior is caused by the suppression of spin relaxation induced by the longitudinal magnetic field. We believe that this behavior is related to the hyperfine interaction of electron spin with magnetic momenta of lattice nuclei.