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Sensing surface lattice strain with Kondo resonance of single Co adatom
Applied Physics Letters ( IF 4 ) Pub Date : 2020-02-03 , DOI: 10.1063/1.5142064
Kota Iwata 1 , Toshio Miyamachi 1 , Emi Minamitani 2, 3 , Fumio Komori 1
Affiliation  

Detection of lattice strain is crucial for various studies in a nanometer scale because it largely modifies the local electronic states and thus various physical and chemical properties. Here, we demonstrate that the Kondo effect in a single magnetic atom on a metal surface can be a quantum sensor for the local lattice strain. Using low-temperature scanning tunneling spectroscopy, we measured the Kondo resonance in a Co adatom on partially N-adsorbed Cu(001) surfaces, which consist of nanoislands of the Cu 2N monolayer and the clean Cu(001) surface compressed by the surrounding Cu 2N nanoislands. The observed Kondo temperature at the compressed clean surface depends on the area size of the surface, i . e ., the strength of the local lattice strain. This behavior is attributed to the change in the distance between the Co adatom and Cu surface due to the surface lattice strain, which is supported by our density functional calculations. These results provide a way to detect the local strain on the sub-angstrom scale by using the sensitivity of quantum many-body effects.Detection of lattice strain is crucial for various studies in a nanometer scale because it largely modifies the local electronic states and thus various physical and chemical properties. Here, we demonstrate that the Kondo effect in a single magnetic atom on a metal surface can be a quantum sensor for the local lattice strain. Using low-temperature scanning tunneling spectroscopy, we measured the Kondo resonance in a Co adatom on partially N-adsorbed Cu(001) surfaces, which consist of nanoislands of the Cu 2N monolayer and the clean Cu(001) surface compressed by the surrounding Cu 2N nanoislands. The observed Kondo temperature at the compressed clean surface depends on the area size of the surface, i . e ., the strength of the local lattice strain. This behavior is attributed to the change in the distance between the Co adatom and Cu surface due to the surface lattice strain, which is supported by our density functional calculations. These results provide a way to detect the local strain on t...

中文翻译:

用单个 Co 吸附原子的 Kondo 共振检测表面晶格应变

晶格应变的检测对于纳米尺度的各种研究至关重要,因为它在很大程度上改变了局部电子状态,从而改变了各种物理和化学性质。在这里,我们证明了金属表面上单个磁性原子的近藤效应可以作为局部晶格应变的量子传感器。使用低温扫描隧道光谱,我们测量了部分 N 吸附的 Cu(001) 表面上 Co 吸附原子中的 Kondo 共振,该表面由 Cu 2N 单层的纳米岛和被周围 Cu 压缩的清洁 Cu(001) 表面组成2N个纳米岛。在压缩的清洁表面观察到的近藤温度取决于表面的面积大小 i 。e ., 局部晶格应变的强度。这种行为归因于由于表面晶格应变导致 Co 吸附原子和 Cu 表面之间距离的变化,我们的密度泛函计算支持了这一点。这些结果提供了一种利用量子多体效应的灵敏度来检测亚埃尺度局部应变的方法。 晶格应变的检测对于纳米尺度的各种研究至关重要,因为它在很大程度上改变了局部电子态,从而各种物理和化学性质。在这里,我们证明了金属表面上单个磁性原子的近藤效应可以作为局部晶格应变的量子传感器。使用低温扫描隧道光谱,我们测量了部分 N 吸附的 Cu(001) 表面上 Co 吸附原子中的 Kondo 共振,它由 Cu 2N 单层的纳米岛和被周围 Cu 2N 纳米岛压缩的清洁 Cu(001) 表面组成。在压缩的清洁表面观察到的近藤温度取决于表面的面积大小 i 。e ., 局部晶格应变的强度。这种行为归因于由于表面晶格应变导致 Co 吸附原子和 Cu 表面之间距离的变化,我们的密度泛函计算支持了这一点。这些结果提供了一种检测 t 上局部应变的方法。这种行为归因于由于表面晶格应变导致 Co 吸附原子和 Cu 表面之间距离的变化,我们的密度泛函计算支持了这一点。这些结果提供了一种检测 t 上局部应变的方法。这种行为归因于由于表面晶格应变导致 Co 吸附原子和 Cu 表面之间距离的变化,我们的密度泛函计算支持了这一点。这些结果提供了一种检测 t 上局部应变的方法。
更新日期:2020-02-03
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