Spin-orbit coupled particle in a spin bath

Abstract

We consider a spin-orbit coupled particle confined in a quantum dot in a bath of impurity spins. We investigate the consequences of spin-orbit coupling on the interactions that the particle mediates in the spin bath. We show that in the presence of spin-orbit coupling, the impurity-impurity interactions are no longer spin conserving. We quantify the degree of this symmetry breaking and show how it relates to the spin-orbit coupling strength. We identify several ways how the impurity ensemble can in this way relax its spin by coupling to phonons. A typical resulting relaxation rate for a self-assembled Mn-doped ZnTe quantum dot populated by a hole is 1 μs. We also show that decoherence arising from nuclear spins in lateral quantum dots is still removable by a spin echo protocol, even if the confined electron is spin-orbit coupled.

Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots

“…[17][18][19][20][21] Experiments typically focus on Mn-doped II-VI and III-V QDs, in which it is possible to include both single [22][23][24][25] and several magnetic impurities, [17][18][19][20][21][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] having similarities with nuclear spins. 41,42 In the first case (single magnetic ion), such systems could be considered as potential quantum bits, quantum memories, or probes to detect an unconventional orbital ordering. 17,[23][24][25]43 In the second case, the presence of several magnetic ions can lead to the formation of a magnetic polaron (MP), a long-standing research topic in magnetic semiconductors.…”

Dipolelike dynamical nuclear spin polarization around a quantum point contact

“…(28)] nor the Overhauser energy δ z [Eq. (40)]. If, on the other hand, the relaxation is dominated by other channels than the electrons, both the nuclear polarization, and the Overhauser energy are multiplied by factor ξ −2 .…”

Magnetic ordering in quantum dots: Open versus closed shells

“…U N h is the charging energy. The p − d exchange interaction between spins of Mn and confined holes has the Ising form 17,[76][77][78][79] because of the strong zaxis anisotropy, arising from spin-orbit interaction in the 2D QDs with energetically favorable heavy holes,…”