Single-photon exchange interaction in a semiconductor microcavity
arXiv:cond-mat/0407639 · doi:10.1103/PhysRevB.72.245311
Abstract
We consider the effective coupling of localized spins in a semiconductor quantum dot embedded in a microcavity. The lowest cavity mode and the quantum dot exciton are coupled and close in energy, forming a polariton. The fermions forming the exciton interact with localized spins via exchange. Exact diagonalization of a Hamiltonian in which photons, spins and excitons are treated quantum mechanically shows that {\it a single polariton} induces a sizable indirect exchange interaction between otherwise independent spins. The origin, symmetry properties and the intensity of that interaction depend both on the dot-cavity coupling and detuning. In the case of a (Cd,Mn)Te quantum dot, Mn-Mn ferromagnetic coupling mediated by a single photon survives above 1 K whereas the exciton mediated coupling survives at 15 K.
4 pages, 3 figures
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- Multi-spin errors in the optical control of a spin quantum memory
- Switching the sign of photon induced exchange interactions in semiconductor microcavities with finite quality factors
- Efficient spin control in high-quality-factor planar micro-cavities