期刊
SCIENCE ADVANCES
卷 3, 期 4, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1602531
关键词
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资金
- DARPA (Defense Advanced Research Projects Agency) MESO (Mesodynamic Architectures) program [N66001-11-1-4107]
- Purdue University
- NSF [1641101]
- Birck Nanotechnology Center at Purdue
- Midwestern Institute for Nanoelectronics Discovery (MIND) of Nanoelectronics Research Initiative (NRI)
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1641101] Funding Source: National Science Foundation
Topological insulators (TIs), with their helically spin-momentum-locked topological surface states (TSSs), are considered promising for spintronics applications. Several recent experiments in TIs have demonstrated a currentinduced electronic spin polarization that may be used for all-electrical spin generation and injection. We report spin potentiometricmeasurements in TIs that have revealed a long-lived persistent electron spin polarization even at zero current. Unaffected by a small bias current and persisting for several days at low temperature, the spin polarization can be induced and reversed by a large writing current applied for an extended time. Although the exact mechanism responsible for the observed long-lived persistent spin polarization remains to be better understood, we speculate on possible roles played by nuclear spins hyperfine-coupled to TSS electrons and dynamically polarized by the spin-helical writing current. Such an electrically controlled persistent spin polarization with unprecedented long lifetime could enable a rechargeable spin battery and rewritable spinmemory for potential applications in spintronics and quantum information.
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