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Hole-Cr+ nanomagnet in a semiconductor quantum dot

We show that the negatively charged Cr+ ion, an excited state of Cr in II-VI semiconductors, can be stable when inserted in a CdTe quantum dot. The Cr+ attracts a hole and forms a hole-Cr+ spin complex with a ferromagnetic coupling. The resulting hole-Cr+ nanomagnet can be controlled optically. The ferromagnetic ground states with total spin Mz=±4 are prepared by resonant optical pumping and a spin memory in the 20 µs range is obtained at 4.2K and zero magnetic field

V. Tiwari, M. Arino, S. Gupta, M. Morita, T. Inoue, D. Caliste, P. Pochet, H. Boukari, S. Kuroda, and L. Besombes

Physical Review B 104, L041301 (2021)

DOI : 10.1103/PhysRevB.104.L041301

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