范德华双层中电场驱动的地下原子迁移\(\textrm{Ta}_{2}\textrm{NiSe}_{5}\)扫描隧道显微镜

IF 0.9 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
Dowook Kim, So Young Kim, Jun Sung Kim, Tae-Hwan Kim
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引用次数: 0

摘要

我们证明了扫描隧道显微镜(STM)尖端产生的强局部电场诱导双层表面下的纳米级结构修饰\(\textrm{Ta}_{2}\textrm{NiSe}_{5}\)。施加具有正样品偏压的电压脉冲会导致脉冲位置的凹陷和沿晶体链方向的横向位移位置的突出。偏倚相关的STM成像和扫描隧道光谱显示,表面电子结构没有可测量的变化,这表明观察到的高度变化来自结构效应,而不是电子效应。我们提出电场驱动范德瓦尔斯隙内各向异性原子迁移,导致亚表面层的可逆和定向重构。连续脉冲进一步证实了这一过程的动态特性,允许局部凹陷和突起被消除或重新定位。我们的研究结果介绍了层状材料中电场诱导的地下图案机制,在范德华材料的可重构纳米级器件中具有潜在的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electric-field-driven subsurface atomic migration in van der Waals bilayer \(\textrm{Ta}_{2}\textrm{NiSe}_{5}\) via scanning tunneling microscopy

We demonstrate that strong local electric fields generated by a scanning tunneling microscope (STM) tip induce nanoscale structural modifications beneath the surface of bilayer \(\textrm{Ta}_{2}\textrm{NiSe}_{5}\). Applying voltage pulses with a positive sample bias leads to the formation of depressions at the pulse sites and protrusions at laterally displaced locations along the crystal’s chain direction. Bias-dependent STM imaging and scanning tunneling spectroscopy reveal no measurable change in the surface electronic structure, indicating that the observed height variations originate from structural, rather than electronic, effects. We propose that the electric field drives anisotropic atomic migration within the van der Waals gap, resulting in reversible and directional reconfiguration of subsurface layers. Sequential pulsing further confirms the dynamic nature of this process, allowing local depressions and protrusions to be erased or repositioned. Our findings introduce a mechanism for electric-field-induced subsurface patterning in layered materials, with potential applications in reconfigurable nanoscale devices in van der Waals materials.

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来源期刊
Journal of the Korean Physical Society
Journal of the Korean Physical Society PHYSICS, MULTIDISCIPLINARY-
CiteScore
1.20
自引率
16.70%
发文量
276
审稿时长
5.5 months
期刊介绍: The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.
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