Individual Cr atom in a semiconductor quantum dot: Optical addressability and spin-strain coupling

被引：27
作者：
Lafuente-Sampietro, A. [1 ,2 ,3 ]
Utsumi, H. [3 ]
Boukari, H. [1 ,2 ]
Kuroda, S. [3 ]
Besombes, L. [1 ,2 ]
机构：
[1] Univ Grenoble Alpes, Inst Neel, F-38000 Grenoble, France
[2] CNRS, Inst Neel, F-38000 Grenoble, France
[3] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 305, Japan
来源：
PHYSICAL REVIEW B | 2016年 / 93卷 / 16期
关键词：
ELECTRON-SPIN; SINGLE;
D O I：
10.1103/PhysRevB.93.161301
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We demonstrate the optical addressability of the spin of an individual chromium atom (Cr) embedded in a semiconductor quantum dot. The emission of Cr-doped quantum dots and their evolution in magnetic field reveal a large magnetic anisotropy of the Cr spin induced by local strain. This results in the zero field splitting of the 0, +/- 1, and +/- 2 Cr spin states and in a thermalization on the magnetic ground states 0 and +/- 1. The observed strong spin to strain coupling of Cr is of particular interest for the development of hybrid spin-mechanical devices where coherent mechanical driving of an individual spin in an oscillator is needed. The magneto-optical properties of Cr-doped quantum dots are modeled by a spin Hamiltonian including the sensitivity of the Cr spin to the strain and the influence of the quantum dot symmetry on the carrier-Cr spin coupling.
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页数：5
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