We study the hyperfine interaction between the nuclear spins and the electrons in a HgTe quantum well, which is the prime experimentally realized example of a two-dimensional topological insulator. The hyperfine interaction is a naturally present, internal source of broken time-reversal symmetry from the point of view of the electrons. The HgTe quantum well is described by the so-called Bernevi...

It has been proposed that valence-band holes can form robust spin qubits1–4 owing to their weaker hyperfine coupling compared with electrons5,6. However, it was demonstrated recently7–11 that the hole hyperfine interaction is not negligible, although a consistent picture of the mechanism controlling its magnitude is still lacking. Here we address this problem by measuring the hole hyperfine con...

The radical pair model has been successful in explaining behavioral characteristics of the geomagnetic compass believed to underlie the navigation capability of certain avian species. In this study, the spin dynamics of the radical pair model and decoherence therein are interpreted from a microscopic state transition point of view. This helps to elucidate the interplay between the hyperfine and...

Spin pumping is an interfacial spin current generation from the ferromagnetic layer to non-magnetic metal at its interface. The polarization of pumped $$\mathbf {J}_s \propto \mathbf {m}\times \dot{\mathbf {m}}$$ depends on dynamics magnetic moment {m}$$ . When materials are based light transition metals, mechanism behind transfer dominated by exchange interaction between localized d-electrons ...