Entanglement of spin-orbit qubits induced by Coulomb interaction Yinan Fang, Yusuf Turek, Jianqiang You and Changpu Sun Eur. Phys. J. B, 87 6 (2014) 140 Published online: 23 June 2014 DOI: 10.1140/epjb/e2014-50172-7