Modulating the spin polarization of photoelectrons from a topological insulator

CFM Seminars

Speaker

Cheol-Hwan Park (Seoul National University, Korea)

When

2016/08/05
14:00

Place

Auditorium of the Centro de Fisica de Materiales, Paseo Manuel de Lardizabal 5, Donostia-San Sebastián

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**Modulating the spin polarization of photoelectrons from a topological insulator ** Cheol-Hwan Park, Seoul National University (Host at CFM: Ivo Souza) Abstract: After a theoretical study [1] predicted that the spin polarization of photoelectrons emitted from a topological insulator is highly tunable such that almost 100 % polarization along any arbitrary direction can be achieved by tuning the polarization of light, a number of experimental confirmations of this photo-induced spin modulation phenomenon followed [2-6]. This photo-induced spin modulation phenomenon involving topological insulators suggests a new kind of spin-polarized electron sources [2]; however, there are some experimental results that cannot be explained by previous theoretical descriptions [1]. In this presentation, I will review these experimental results [2,4] and our interpretation [7]. [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). [7] J. H. Ryoo and C.-H. Park, Phys. Rev. B, 93, 085419 (2016).