Collective nuclear stabilization in single quantum dots by noncollinear hyperfine interaction

Abstract

We present a theory of efficient suppression of the collective nuclear spin fluctuation, which prolongs the electron spin coherence time through the noncollinear hyperfine interaction between the nuclear spins and the hole spin. This provides a general paradigm to combat decoherence by direct control of environmental noise, and a possible solution to the puzzling observation of symmetric broadening of the absorption spectra in two recent experiments [Xu et al., Nature (London) 459, 1105 (2009) and Latta et al., Nature Phys. 5, 758 (2009)].