Geometrical spin dephasing in quantum dots
  We study spin-orbit mediated relaxation and dephasing of electron spins in quantum dots. We show that higher order contributions provide a relaxation mechanism that dominates for low magnetic fields and is of geometrical origin. In the low-field limit relaxation is dominated by coupling to electron-hole excitations and possibly $1/f$ noise rather than phonons. 
Pablo San-Jose, Gergely Zarand, Alexander Shnirman, Gerd Sch\"on