Coherent precession of an individual 5/2 spin

TL;DR

This study demonstrates the direct observation of coherent precession of an individual Mn$^{2+}$ ion with spin 5/2 in a quantum dot, revealing complex dynamics influenced by strain, with potential applications in local strain sensing.

Contribution

First direct measurement of large-spin coherent precession in a single quantum dot, highlighting strain effects on spin dynamics.

Findings

Observation of non-sinusoidal spin evolution

Detection of beatings due to strain-induced energy level differences

Potential use of the impurity as a local strain sensor

Abstract

We present a direct observation of a coherent spin precession of an individual Mn$^{2+}$ ion, having both electronic and nuclear spins equal to 5/2, embedded in a CdTe quantum dot and placed in magnetic field. The spin state evolution is probed in a time-resolved pump-probe measurement of absorption of the single dot. The experiment reveals subtle details of the large-spin coherent dynamics, such as non-sinusoidal evolution of states occupation, and beatings caused by the strain-induced differences in energy levels separation. Sensitivity of the large-spin impurity on the crystal strain opens the possibility of using it as a local strain probe.