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arXiv 2012.07715cond-mat.mes-hallphysics.app-ph
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应变诱导的二维材料纳米尺度局部输运调控

Strain Induced Modulation of Local Transport of 2D Materials at the Nanoscale

George Washington University(乔治华盛顿大学);University of California at San Diego(加州大学圣地亚哥分校)

Rishi Maiti, Md Abid Shahriar Rahman Saadi, Rubab Amin, Ongun Ozcelik, Berkin Uluutku, Chandraman Patil, Can Suer, Santiago Solares, Volker J. Sorger

AI总结:

研究通过原子力显微镜探讨应变对二维材料局部导电性的影响,揭示应变与导电性变化的关系,为下一代器件设计提供新思路。

摘要:

应变工程为调控二维材料的电子能带结构提供了独特手段,从而实现物理性质的有效连续调制。通过导电原子力显微镜研究了几层过渡金属二硫化物的应变诱导局部导电性变化,提出了一种新的应变表征技术。结果显示导电性变化与分子动力学模拟预测的应变偏差平行,证实了有效质量和表面电荷密度的变化。进一步表明,随着拉伸应变的增加,导带最小值的逐渐降低解释了观察到的减少的有效肖特基势垒高度。这种由表面拓扑结构诱导的应变变化在原子层材料纳米尺度上产生了空间纹理的电子行为,为控制基本材料性质提供了新机会,并为电子、纳米光子学、柔性电子学或智能衣物等领域的器件设计提供了多种可能性。

英文摘要:

Strain engineering offers unique control to manipulate the electronic band structure of two-dimensional materials (2DMs) resulting in an effective and continuous tuning of the physical properties. Ad-hoc straining 2D materials has demonstrated novel devices including efficient photodetectors at telecommunication frequencies, enhanced-mobility transistors, and on-chip single photon source, for example. However, in order to gain insights into the underlying mechanism required to enhance the performance of the next-generation devices with strain(op)tronics, it is imperative to understand the nano- and microscopic properties as a function of a strong non-homogeneous strain. Here, we study the strain-induced variation of local conductivity of a few-layer transition-metal-dichalcogenide using a conductive atomic force microscopy. We report a novel strain characterization technique by capturing the electrical conductivity variations induced by local strain originating from surface topography at the nanoscale, which allows overcoming limitations of existing optical spectroscopy techniques. We show that the conductivity variations parallel the strain deviations across the geometry predicted by molecular dynamics simulation. These results substantiate a variation of the effective mass and surface charge density by .026 me/% and .03e/% of uniaxial strain, respectively. Furthermore, we show and quantify how a gradual reduction of the conduction band minima as a function of tensile strain explains the observed reduced effective Schottky barrier height. Such spatially-textured electronic behavior via surface topography induced strain variations in atomistic-layered materials at the nanoscale opens up new opportunities to control fundamental material properties and offers a myriad of design and functional device possibilities for electronics, nanophotonics, flextronics, or smart cloths.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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