期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.127601
关键词
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资金
- Ministerio de Economia, Industria y Competitividad (MINECO-Spain) [MAT2016-77100-C2-2-P, PID2019108573GB-C22]
- Ministerio de Economia, Industria y Competitividad (MINECO-Spain) through Severo Ochoa FUNFUTURE center of excellence [CEX2019-000917-S]
- Generalitat de Catalunya [2017 SGR1506]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [724529]
By utilizing first-principles theory, flexoelectricity is investigated as a potential way to overcome the difficulty in switching polarization of metallic materials, providing a means to improve experimental control over band topology.
Although rare, spontaneous breakdown of inversion symmetry sometimes occurs in a material which is metallic: these are commonly known as polar metals or ferroelectric metals. Their polarization, however, is difficult to switch via an electric field, which limits the experimental control over band topology. Here we investigate, via first-principles theory, flexoelectricity as a possible way around this obstacle with the well-known polar metal LiOsO3. The flexocoupling coefficients are computed for this metal with high accuracy with an approach based on real-space sums of the interatomic force constants. A Landau-Ginzburg-Devonshire-type first-principles Hamiltonian is built and a critical bending radius to switch the material is estimated, whose order of magnitude is comparable to that of BaTiO3.
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