Temperature dependence of hole spin coherence in (In,Ga)As quantum dots measured by mode-locking and echo techniques
arXiv:1301.4149 · doi:10.1103/PhysRevB.87.115307
Abstract
The temperature dependence of the coherence time of hole spins confined in self-assembled (In,Ga)As/GaAs quantum dots is studied by spin mode-locking and spin echo techniques. Coherence times limited to about a μs are measured for temperatures below 8 K. For higher temperatures a fast drop occurs down to a few ns over a 10 K range. The hole-nuclear hyperfine interaction appears too weak to account for these limitations. We suggest that spin-orbit related interactions are the decisive sources for hole spin decoherence.
5 pages, 4 figures
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- Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei
- All-optical implementation of a dynamic-decoupling protocol for hole spins in (In,Ga)As quantum dots
- Spin dynamics and magneto-optical response in charge-neutral tunnel-coupled quantum dots
- Hole spin coherence in InAs/InAlGaAs self-assembled quantum dots emitting at telecom wavelengths
- Spin properties in droplet epitaxy-grown telecom quantum dots