Hole-Cr+ nanomagnet in a semiconductor quantum dot
Hole-Cr+ nanomagnet in a semiconductor quantum dot
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半导体量子点中的空穴铬纳米磁体
DOI：
10.1103/physrevb.104.l041301
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发表时间：
2021
影响因子：
3.7
通讯作者：
L. Besombes
中科院分区：
文献类型：
--
作者：
V. Tiwari;M. Arino;S. Gupta;M. Morita;T. Inoue;D. Caliste;P. Pochet;H. Boukari;S. Kuroda;L. Besombes
我们研究了基于电离受主自旋的稀磁半导体系统。研究表明，Cr在II-VI族半导体中的激发态--负电荷离子，插入到CdTe量子点（QD）中可以保持稳定。量子点中的重空穴被吸附，形成稳定的空穴复合物。光学探测揭示了这个系统的重空穴和自旋之间的铁磁耦合。在低温下，平行自旋空穴系统基态的热化阻止了多余电子在原子壳层的光学复合。我们研究了由空穴交换相互作用形成的纳米磁体的动力学。利用共振光抽运可以控制铁磁基态的自旋弛豫时间，并在K.这种零磁场下的自旋记忆受到与声子相互作用的限制。
We study a diluted magnetic semiconductor system based on the spin of the ionized acceptor. We show that the negatively chargedion, an excited state of the Cr in II-VI semiconductor, can be stable when inserted in a CdTe quantum dot (QD). Theattracts a heavy hole in the QD and form a stable hole-complex. Optical probing of this system reveals a ferromagnetic coupling between heavy holes andspins. At low temperature, the thermalization on the ground state of the hole-system with parallel spins prevents the optical recombination of the excess electron on theshell of the atom. We study the dynamics of the nanomagnet formed by the hole-exchange interaction. The ferromagnetic ground states withcan be controlled by resonant optical pumping and a spin relaxation time in therange is obtained atK. This spin memory at zero magnetic field is limited by the interaction with phonons.