滑动铁电中铁电性的大光诱导调谐

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical review letters Pub Date : 2024-11-07 DOI:10.1103/physrevlett.133.196801
Lingyuan Gao, Laurent Bellaiche
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引用次数: 0

摘要

堆叠非极性单层材料已成为获取二维范德华(vdW)材料铁电性的有效策略。在特定的堆叠顺序下,层间电荷转移可产生平面外偶极子分量,极化幅度和方向可通过层间滑动来改变。在这项研究中,我们利用 ab initio 计算证明,在原型滑动铁电体斜方体堆叠双层过渡金属二掺杂物 MoS2 中,平面外电极化可以通过光激发在给定滑动的很大范围内进行稳健的调整。这种调谐既与结构有关,即光诱导的结构畸变,也与电荷有关,即光激发载流子的分布。我们阐明了光激发在不同光强度下调节滑动铁电性的不同作用,并强调了光在操纵二维 vdW 材料极化中的关键作用。
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Large Photoinduced Tuning of Ferroelectricity in Sliding Ferroelectrics
Stacking nonpolar, monolayer materials has emerged as an effective strategy to harvest ferroelectricity in two-dimensional (2D) van der Waals (vdW) materials. At a particular stacking sequence, interlayer charge transfer allows for the generation of out-of-plane dipole components, and the polarization magnitude and direction can be altered by an interlayer sliding. In this work, we use ab initio calculations and demonstrate that in prototype sliding ferroelectrics rhombohedrally-stacked bilayer transition metal dichalcogenides MoS2, the out-of-plane electric polarization can be robustly tuned by photoexcitation in a large range for a given sliding. Such tuning is associated with both a structural origin—i.e., photoinduced structural distortion—and a charge origin, namely, the distribution of photoexcited carriers. We elucidate different roles that photoexcitation plays in modulating sliding ferroelectricity under different light intensities, and we highlight the pivotal role of light in manipulating polarization of 2D vdW materials.
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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