Journal
PHYSICAL REVIEW B
Volume 91, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.235437
Keywords
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Funding
- Defense Advanced Research Projects Agency MESO program [N66001-11-1-4110]
- Office of Naval Research Grant [N000141210117]
- Universite de Sherbrooke
- National Science and Engineering Research Council of Canada
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We demonstrate that the charge-spin conversion efficiency of topological insulators (TI) can be experimentally determined by injecting spin-polarized tunneling electrons into a TI. Through a comparative study between bismuth selenide and bismuth antimony telluride, we verified the topological-surface-state origin of the observed giant spin signals. By injecting energetic electrons into bismuth selenide, we further studied the energy dependence of the effective spin polarization at the TI surface. The experimentally verified large spin polarization, as well as our calculations, provides new insights into optimizing TI materials for near room-temperature spintronic applications.
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