Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 7: Spintronics I (joined session with TT)

HL 7.8: Vortrag

Montag, 20. März 2017, 11:45–12:00, POT 151

Hidden orbital polarization in centrosymmetric materials — •Ji Hoon Ryoo and Cheol-Hwan Park — Department of Physics & Astronomy, Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

Until recently, the possibility of spatial spin distribution in centrosymmetric and non-magnetic materials was largely dismissed, because their electronic bands are degenerate even if spin-orbit coupling is strong. However, Zhang et al. [1] has pointed out that even in those materials, the degenerate Bloch states can have spin polarization localized at different sites in real space, significantly broadening the scope of spintronics to materials with inversion symmetry. On the other hand, the orbital magnetic moment could play as an important role as the spin moment in the magnetization of solids, in both equilibrium and non-equilibrium situations [2-5]. In this talk, we report that the hidden, or sublattice-dependent orbital polarization of Bloch states can be large in common centrosymmetric materials, and suggest some implications of this finding to photoemission spectroscopies and antiferromagnetic information technology.

1. X. Zhang et al., Nat. Phys. 10, 387 (2014).

2. R. A. Reck and D. L. Fry, Phys. Rev. 184, 492 (1969).

3. D. Ceresoli et al., Phys. Rev. B 81, 060409 (2010).

4. T. Yoda, T. Yokoyama, and S. Murakami, Sci. Rep. 5, 12024 (2015).

5. S. Zhong, J. E. Moore, and I. Souza, Phys. Rev. Lett. 116, 077201 (2016).