Enhanced Rashba effect for hole states in a quantum dotA. Manaselyan and T. Chakraborty
Department of Physics and Astronomy, University of Manitoba - Winnipeg, Canada R3T 2N2
received 14 July 2009; accepted in final form 17 September 2009; published October 2009
published online 16 October 2009
The effect of Rashba spin-orbit (SO) interaction on the hole states in a quantum dot is studied in the presence of an external magnetic field. We demonstrate here that the Rashba SO coupling has a profound effect on the energy spectrum of the holes revealing level repulsions between the states with the same total momentum. We also show that the resulting spin-orbit gap is much larger than the corresponding one for the electron energy levels in a quantum dot. Inter-hole interactions only marginally reduce the spin-orbit gap. This enhanced Rashba effect would manifest itself in the tuneling current which depends on the spin-orbit coupling strength.
73.21.La - Quantum dots.
71.70.Ej - Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect.
75.75.+a - Magnetic properties of nanostructures.
© EPLA 2009