Experimental separation of Rashba and Dresselhaus spin splittings in semiconductor quantum wells
Ganichev, SD × Bel'kov, VV Golub, LE Ivchenko, EL Schneider, P Giglberger, S Eroms, J De Boeck, J Borghs, Gustaaf Wegscheider, W Weiss, D Prettl, W #
American physical soc
Physical Review Letters vol:92 issue:25
The relative strengths of Rashba and Dresselhaus terms describing the spin-orbit coupling in semiconductor quantum well (QW) structures are extracted from photocurrent measurements on n-type InAs QWs containing a two-dimensional electron gas (2DEG). This novel technique makes use of the angular distribution of the spin-galvanic effect at certain directions of spin orientation in the plane of a QW. The ratio of the relevant Rashba and Dresselhaus coefficients can be deduced directly from experiment and does not relay on theoretically obtained quantities. Thus our experiments open a new way to determine the different contributions to spin-orbit coupling.