Presentation Information
[7p-P03-30]Electrical detection of spin-polarization in nonmagnetic heavy metals induced by circularly polarized light
〇Soichiro Mochizuki1, Itaru Sugiura2, Teruo Ono2, Takuya Satoh1, Kihiro Yamada1 (1.Science Tokyo, 2.Kyoto Univ.)
Keywords:
spintronics,circularly polarized light,spin-orbit interaction
Circularly polarized light can transfer its spin angular momentum to electrons in condensed-matter materials via helicity-dependent electric dipole transitions inside spin-orbit split electronic structures. This helicity-dependent optical excitations can create spin-polarized states and spin currents in the conduction bands. While the optical generation of spin-polarized states and spin currents has been extensively electrically investigated in III-V semiconductors and topological insulators, it is not studied for heavy metals with strong spin-orbit interactions.
Here, we report the observation of spin-polarized states in nonmagnetic heavy metals under the irradiation of circularly polarized light. Thin heavy metal films were processed into Hall devices and circularly polarized light was focused on the center of the Hall cross. We applied dc currents in the longitudinal direction and measured the Hall voltages. We find that the Hall resistance depends on the laser intensity.
Here, we report the observation of spin-polarized states in nonmagnetic heavy metals under the irradiation of circularly polarized light. Thin heavy metal films were processed into Hall devices and circularly polarized light was focused on the center of the Hall cross. We applied dc currents in the longitudinal direction and measured the Hall voltages. We find that the Hall resistance depends on the laser intensity.