DataVXAdvanced MaterialsPaper
journal article·2020-12Open access

Visualizing Tailored Spin Phenomena in a Reduced‐Dimensional Topological Superlattice

Rui Sun, Shijia Yang, Xu Yang, A. Kumar, Eric Vetter, Wenhua Xue, Yan Li, Na Li, Yang Li, Shihao Zhang, Binghui Ge, Xiang‐qun Zhang, Wei He, Alexander F. Kemper, Dali Sun, Zhao‐hua Cheng

Advanced Materials· Volume 32· Issue 49
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Source abstract

Abstract

Abstract 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, (Bi2/Bi2Se3)‐(Bi2/Bi2Se3)N or (□/Bi2Se3)‐(Bi2/Bi2Se3)N (N is the repeating unit, □ represents an empty layer) by controlling the termination via molecular beam epitaxy. The Bi2‐terminated superlattice exhibits a single Dirac cone with a spin momentum splitting ≈0.5 Å−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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Research context

OpenAlex topics: Topological Materials and Phenomena · 2D Materials and Applications · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China

Department of Physics North Carolina State University Raleigh NC 27695 USA

Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695 USA

Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China

Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA

Songshan Lake Materials Laboratory Dongguan 523808 China

Funding

National Natural Science Foundation of China · Office of Science · U.S. Department of Energy

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