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arXiv 2104.08978cond-mat.mtrl-sciquant-ph
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在二维异质结界面上捕获三维原子缺陷和声子局域化

Capturing 3D atomic defects and phonon localization at the 2D heterostructure interface

Xuezeng Tian, Xingxu Yan, Georgios Varnavides, Yakun Yuan, Dennis S. Kim, Christopher J. Ciccarino, Polina Anikeeva, Ming-Yang Li, Lain-Jong Li, Prineha Narang,… 展开作者

Xuezeng Tian, Xingxu Yan, Georgios Varnavides, Yakun Yuan, Dennis S. Kim, Christopher J. Ciccarino, Polina Anikeeva, Ming-Yang Li, Lain-Jong Li, Prineha Narang, Xiaoqing Pan, Jianwei Miao

摘要:

异质结构界面处的3D局部原子结构和晶体缺陷控制着它们的电子、磁性、光学、催化和拓扑量子特性,但迄今为止还没有任何直接的实验测定。在这里,我们确定的3D局部原子的位置在界面的MoS 2-WSe 2异质结皮米精度和相关的3D原子缺陷与本地化的振动特性在外延界面。我们观察点缺陷,键变形,原子尺度的波纹和测量全三维应变张量在异质界面。通过使用实验的三维原子坐标作为直接输入到第一性原理计算,我们揭示了新的声子模式本地化的界面,这是证实了空间分辨电子能量损失谱。我们期望这项工作将打开大门,在单原子水平上的异质结构界面的广泛的结构-性能关系的关联。

英文摘要:

The 3D local atomic structures and crystal defects at the interfaces of heterostructures control their electronic, magnetic, optical, catalytic and topological quantum properties, but have thus far eluded any direct experimental determination. Here we determine the 3D local atomic positions at the interface of a MoS2-WSe2 heterojunction with picometer precision and correlate 3D atomic defects with localized vibrational properties at the epitaxial interface. We observe point defects, bond distortion, atomic-scale ripples and measure the full 3D strain tensor at the heterointerface. By using the experimental 3D atomic coordinates as direct input to first principles calculations, we reveal new phonon modes localized at the interface, which are corroborated by spatially resolved electron energy-loss spectroscopy. We expect that this work will open the door to correlate structure-property relationships of a wide range of heterostructure interfaces at the single-atom level.

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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