期刊
ADVANCED MATERIALS
卷 32, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202005315
关键词
dual topological insulators; spin lifetime; spin‐ to‐ charge conversion; spintronics; topological superlattices
类别
资金
- National Key Research Program of China [2016YFA0300701, 2017YFB0702702]
- National Natural Sciences Foundation of China [52031015, 1187411, 51427801, 51671212]
- Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-JSC023, KJZD-SW-M01, ZDYZ2012-2]
- NC State University-Nagoya Research Collaboration Grant
- NC State Faculty Research and Professional Development (FRPD) program
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
Emergent topological insulators (TIs) and their design are in high demand for manipulating and transmitting spin information toward ultralow-power-consumption spintronic applications. Here, distinct topological states with tailored spin properties can be achieved in a single reduced-dimensional TI-superlattice, (Bi-2/Bi2Se3)-(Bi-2/Bi2Se3)(N) or (/Bi2Se3)-(Bi-2/Bi2Se3)(N) (N is the repeating unit, represents an empty layer) by controlling the termination via molecular beam epitaxy. The Bi-2-terminated superlattice exhibits a single Dirac cone with a spin momentum splitting approximate to 0.5 angstrom(-1), producing a pronounced inverse Edelstein effect with a coherence length up to 1.26 nm. In contrast, the Bi2Se3-terminated superlattice is identified as a dual TI protected by coexisting time reversal and mirror symmetries, showing an unexpectedly long spin lifetime up to 1 ns. The work elucidates the key role of dimensionality and dual topological phases in selecting desired spin properties, suggesting a promise route for engineering topological superlattices for high-performance TI-spintronic devices.
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