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Ferroelectric Switching of Pure Spin Polarization in Two-Dimensional Electron Gas
- Source :
- Nano Letters. 20:7230-7236
- Publication Year :
- 2020
- Publisher :
- American Chemical Society (ACS), 2020.
-
Abstract
- 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.
- Subjects :
- Materials science
Spin polarization
Spintronics
Condensed matter physics
Mechanical Engineering
Superlattice
Bioengineering
02 engineering and technology
General Chemistry
Quantum Hall effect
021001 nanoscience & nanotechnology
Condensed Matter Physics
Ferroelectricity
Condensed Matter::Materials Science
Ferromagnetism
General Materials Science
Multiferroics
0210 nano-technology
Spin (physics)
Subjects
Details
- ISSN :
- 15306992 and 15306984
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Nano Letters
- Accession number :
- edsair.doi.dedup.....851e9ce28c21dcad0bee40e3dff5333b