Direct visualization of surface phase of oxygen molecules physisorbed on Ag(111) surface: A two-dimensional quantum spin system
Direct visualization of surface phase of oxygen molecules physisorbed on Ag(111) surface: A two-dimensional quantum spin system
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物理吸附在 Ag(111) 表面的氧分子表面相的直接可视化：二维量子自旋系统
DOI：
10.1103/physrevb.93.081408
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Yukio Hasegawa
中科院分区：
文献类型：
--
作者：
Shunji Yamamoto;Yasuo Yoshida;Hiroshi Imada;Yousoo Kim;and Yukio Hasegawa
本文报道了用低温扫描隧道显微镜在实空间中观察到的氧分子在Ag（111）表面上物理吸附的二维扭曲三角晶格。通过测量其热稳定性，证实了该单分子膜的物理吸附状态，这与以前的热脱附光谱显示出良好的一致性。在Monte Carlo计算中考虑分子间的交换作用，定量地再现了所观察到的晶格畸变，表明反铁磁有序自旋的重要作用.在隧穿谱中，在4.7K下，没有观察到与物理吸附在Ag（110）上的情况不同的Kondo共振。这些结果表明，分子的本征自旋被保留，在表面上形成了二维反铁磁量子自旋系统。
We report on the real-space observation of the two-dimensional distorted triangular lattice of physisorbed oxygenmolecules on an Ag(111) surface by low-temperature scanning tunneling microscopy. The physisorbed state of themonolayers was confirmed by measuring their thermal stability, which showed good agreement with previous thermal desorption spectroscopy. The distortion of the observed lattice was reproduced quantitatively by considering the intermolecular exchange interaction in Monte Carlo calculations, indicating a critical role of antiferromagnetic ordering ofspins. In tunneling spectra, the Kondo resonance was not observed on thelayer at 4.7 K unlike the case of physisorbedon Ag(110). These results indicate that an intrinsicspin of themolecules was preserved to form a two-dimensional antiferromagnetic quantum spin system on the surface.