Reversal of the circular dichroism in the angle-resolved photoemission from Bi2Te3

Autor:	Scholz, M. R., Sánchez-Barriga, J., Braun, J., Marchenko, D., Varykhalov, A., Lindroos, M., Wang, Yung Jui, Lin, Hsin, Bansil, A., Minár, J., Ebert, H., Volykhov, A., Yashina, L. V., Rader, O.
Rok vydání:	2013
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.110.216801
Popis:	The helical Dirac fermions at the surface of topological insulators show a strong circular dichroism which has been explained as being due to either the initial-state spin angular momentum, the initial-state orbital angular momentum, or the handedness of the experimental setup. All of these interpretations conflict with our data from Bi2Te3 which depend on the photon energy and show several sign changes. Our one-step photoemission calculations coupled to ab initio theory confirm the sign change and assign the dichroism to a final-state effect. The spin polarization of the photoelectrons, instead, remains a reliable probe for the spin in the initial state. Comment: 16 pages, 4 figures; submitted to Physical Review Letters
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1303.6161 Zobrazit plný text záznamu View this record from Arxiv