Nontrivial Nature and Penetration Depth of Topological Surface States in Thin Films
Physical review letters, 2018•APS
The nontrivial feature and penetration depth of the topological surface states (TSS) in SmB 6
were studied via spin pumping. The experiments used SmB 6 thin films grown on the bulk
magnetic insulator Y 3 Fe 5 O 12 (YIG). Upon the excitation of magnetization precession in
the YIG, a spin current is generated in the SmB 6 that produces, via spin-orbit coupling, a
lateral electrical voltage in the film. This spin-pumping voltage signal becomes considerably
stronger as the temperature decreases from 150 to 10 K, and such an enhancement most …
were studied via spin pumping. The experiments used SmB 6 thin films grown on the bulk
magnetic insulator Y 3 Fe 5 O 12 (YIG). Upon the excitation of magnetization precession in
the YIG, a spin current is generated in the SmB 6 that produces, via spin-orbit coupling, a
lateral electrical voltage in the film. This spin-pumping voltage signal becomes considerably
stronger as the temperature decreases from 150 to 10 K, and such an enhancement most …
The nontrivial feature and penetration depth of the topological surface states (TSS) in were studied via spin pumping. The experiments used thin films grown on the bulk magnetic insulator (YIG). Upon the excitation of magnetization precession in the YIG, a spin current is generated in the that produces, via spin-orbit coupling, a lateral electrical voltage in the film. This spin-pumping voltage signal becomes considerably stronger as the temperature decreases from 150 to 10 K, and such an enhancement most likely originates from the spin-momentum locking of the TSS and may thereby serve as evidence for the nontrivial nature of the TSS. The voltage data also show a unique film thickness dependence that suggests a TSS depth of . The spin-pumping results are supported by transport measurements and analyses using a tight binding model.
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