| AVS 61st International Symposium & Exhibition | |
| Magnetic Interfaces and Nanostructures | Monday Sessions |
| Session MI-MoA |
| Session: | Topological Insulators/Rashba Effect |
| Presenter: | Koji Miyamoto, Hiroshima Synchrotron Radiation Center, Japan |
| Correspondent: | Click to Email |
Topological insulators and Rashba systems possess peculiar spin dependent electronic structure arising from a combination between a broken space inversion symmetry and strong spin-orbit interaction and are expected as key materials to revolutionize spin current devices without external magnetic field. However, the spin-orbit interaction cause the spin diffuse scattering and spin relaxation time shortens. For promoting practical use, it is necessary to enhance the short spin relaxation time. Topological insulators and Rashba systems possess peculiar spin dependent electronic structure arising from a combination between a broken space inversion symmetry and strong spin-orbit interaction and are expected as key materials to revolutionize spin current devices without external magnetic field. However, the spin-orbit interaction cause the spin diffuse scattering and spin relaxation time shortens.
For promoting practical use, it is necessary to enhance the short spin relaxation time. The spin relaxation time is also dependent on the spin texture caused by spin-orbit interaction, therefore, it enhance demand to directly observe the spin dependent electronic structure. The spin- and angle-resolved photoemission spectroscopy (spin-ARPES) is a most powerful tool to do it. However, it is not enough energy- and angle-resolution (ΔE~100 meV, Δθ~2°) of common spin-ARPES systems to clarify the detail spin texture due to the low efficiency (ε~10-4) of the conventional Mott-type spin detector. Recently, our group have developed novel high-efficient spin-ARPES system[1]. The system consists of a highe performance hemispherical analyzer (VG-Scienta R-4000) and high efficient spin detector based on very low energy electron diffraction of Fe(001)p(1x1)-O, which has 100 times higher efficiency. Finally, the highest ΔE and Δθ have been improved to 8meV and 0.37°.
In this symposium, I present the researches on spin texture for several strongly spin-orbit coupled system such as Rashba systems [2] and topological insulators [3] studied by our developed high efficient spin-ARPES system.
Reference
[1] T. Okuda, K. Miyamoto et al., Rev. Sci. Instrum. 82, 103302 (2011).
[2] K. Miyamoto et al., New. J. Phys. accepted.
[3] K. Miyamoto et al., Phys. Rev. Lett. 109, 166802(2012).