Out-of-plane polarization induced in magnetically-doped topological insulator Bi1.37V0.03Sb0.6Te2Se by circularly polarized synchrotron radiation above a Curie temperature

By means of angle- and spin-resolvedphotoemission, we demonstrate a possibility of the out-of-plane spinpolarization of topological surface states and corresponding lifting of the Kramers degeneracy at theDirac point induced in magnetically-doped topological insulator Bi1.37V0.03Sb0.6Te2Se by circularly polarized synchrotron radiation (SR) at roomtemperature. It has been shown that the induced out-of-planepolarization is created due to an “optically”-generated uncompensated spin accumulation with transferring the induced torque to the diluted V 3d ions. We have found theoretically a relation between the imbalance in depopulation of theDirac cone states underphotoexcitation, thegeneration of steady-state uncompensated spin accumulation and the inducedmagnetization that can be managed by thepolarization of SR.

Source: Applied Physics Letters - November 30, 2016 Category: Physics Authors: A. M. Shikin, A. A. Rybkina, I. I. Klimovskikh, M. V. Filianina, K. A. Kokh, O. E. Tereshchenko, P. N. Skirdkov, K. A. Zvezdin and A. K. Zvezdin Source Type: research