Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Topology- and Symmetry-Protected Materials

O 29.6: Vortrag

Dienstag, 8. März 2016, 12:00–12:15, S051

Modulating the spin polarization of photoelectrons from a topological insulator — •Ji Hoon Ryoo and Cheol-Hwan Park — Department of Physics, Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

It has been predicted that the spin polarization of photoelectrons emitted from a topological insulator is highly tunable so that almost 100 % polarization along any arbitrary direction can be achieved by tuning the polarization of light [1]. There have been a number of experimental confirmations of this photo-induced spin modulation phenomenon [2-6]. Although this photo-induced spin modulation in topological insulators suggests a new kind of spin-polarized electron sources [2], there have been some experimental results that cannot be explained by previous theoretical descriptions [1]. In this presentation, we theoretically investigate photoemission process from topological insulators and interpret the recent experimental observations.

[1] C.-H. Park, S. G. Louie, Phys. Rev. Lett. 109, 097601 (2012).

[2] C. Jozwiak et al., Nat. Phys. 9, 293 (2013).

[3] Z.-H. Zhu et al., Phys. Rev. Lett. 112, 076802 (2014).

[4] Z. Xie et al., Nat. Commun. 5, 3382 (2014).

[5] Y. Cao et al., arXiv:1211.5998v1

[6] J. Sánchez-Barriga et al., Phys. Rev. X 4, 011046 (2014).