Spin dynamics of an individual Cr atom in a semiconductor quantum dot under optical excitation
Abstract
We studied the spin dynamics of a Cr atom incorporated in a II-VI semiconductor quantum dot using photon correlation techniques. We used recently developed singly Cr-doped CdTe/ZnTe quantum dots to access the spin of an individual magnetic atom. Auto-correlation of the photons emitted by the quantum dot under continuous wave optical excitation reveals fluctuations of the localized spin with a timescale in the 10 ns range. Cross-correlation gives quantitative transfer time between Cr spin states. A calculation of the time dependence of the spin levels population in Cr-doped quantum dots shows that the observed spin dynamics is dominated by the exciton-Cr interaction. These measurements also provide a lower bound in the 20 ns range for the intrinsic Cr spin relaxation time.
- Publication:
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Applied Physics Letters
- Pub Date:
- August 2016
- DOI:
- 10.1063/1.4959243
- arXiv:
- arXiv:1606.05476
- Bibcode:
- 2016ApPhL.109e3103L
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- doi:10.1063/1.4959243