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arXiv 1807.08457cond-mat.mes-hallcond-mat.mtrl-sci
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TiO2(110)表面单个缺陷的光学斯塔克效应

Optical Stark Effect of a Single Defect on TiO2(110) Surface

Lihuan Sun, Anning Dong, Jianmei Li, Dong Hao, Xiangqian Tang, Shichao Yan, Yang Guo, Xinyan Shan, Xinghua Lu

摘要:

在单分子或原子尺度上探测光学斯塔克效应对于理解表面上的许多光致化学和物理过程至关重要。本文报道了利用光辅助扫描隧道光谱研究TiO_2(110)表面单原子缺陷的光学斯塔克效应。当激光耦合到隧道结中时,在微分电导谱中,OH-O2缺陷的带隙中间态发生了显著的变化。随着激光功率的逐渐增加,带隙中间态的能量随着强度的增加和峰宽的加宽而远离费米能级。用Autler-Townes公式解释了这一现象。这种大的光学斯塔克效应是由于电子隧穿过程中的尖端增强和瞬态带电态的强偶极矩。我们的研究为在微观尺度上探索电子-光子相互作用提供了新的视角。

英文摘要:

Probing optical Stark effect at the single-molecule or atomic scale is crucial for understanding many photo-induced chemical and physical processes on surfaces. Here we report a study about optical Stark effect of single atomic defects on TiO2(110) surface with photo-assisted scanning tunneling spectroscopy. When a laser is coupled into the tunneling junction, the mid-gap state of OH-O2 defects changes remarkably in the differential conductance spectra. As laser power gradually increases, the energy of the mid-gap state shifts away from the Fermi level with increase in intensity and broadening of peak width. The observation can be explained as optical Stark effect with the Autler-Townes formula. This large optical Stark effect is due to the tip-enhancement and the strong dipole moment in the transient charged state during electron tunneling. Our study provides new aspects in exploring electron-photon interactions at the microscopic scale.

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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