期刊
NANO LETTERS
卷 20, 期 10, 页码 7230-7236出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02584
关键词
Two-dimensional electron gas; multiferroics; half-metal; ferroelectric control; spin field-effect transistor
类别
资金
- National Key Research and Development Project [2019YFB2203403]
- National Natural Science Foundation of China [61774059]
- National Natural Science Foundation of Shanghai [18ZR1412500]
- ECNU Public Platform for Innovation [001]
- Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-FG02-07ER46431]
Two-dimensional electron gas (2DEG) created at compound interfaces can exhibit a broad range of exotic physical phenomena, including quantum Hall phase, emergent ferromagnetism, and superconductivity. Although electron spin plays key roles in these phenomena, the fundamental understanding and application prospects of such emergent interfacial states have been largely impeded by the lack of purely spin-polarized 2DEG. In this work, by first-principles calculations of the multiferroic superlattice GeTe/MnTe, we find the ferroelectric polarization of GeTe is concurrent with the half-metallic 2DEG at interfaces. Remarkably, the pure spin polarization of the 2DEG can be created and annihilated by polarizing and depolarizing the ferroelectrics and can be switched (between pure spin-up and pure spin-down) by flipping the ferroelectric polarization. Given the electric-field amplification effect of ferroelectric electronics, we envision multiferroic superlattices could open up new opportunities for low-power, high-efficiency spintronic devices such as spin field-effect transistors.
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