Image charge effect on the light emission of rutile TiO<sub>2</sub>(110) induced by a scanning tunneling microscope<xref rid="cpb_27_7_077301_fn1" ref-type="fn">*</xref><fn id="cpb_27_7_077301_fn1"> <label>*</label><p>Project supported by the National Key R&D Program of China (Grant Nos. 2016YFA0300901 and 2017YFA0205003), the National Natural Science Foundation of China (Grant Nos. 11634001 and 21725302), and the Key Research Program of the Chinese Academy of Sciences (Grant No. XDPB08-1).</p></fn>

Image charge effect on the light emission of rutile TiO₂(110) induced by a scanning tunneling microscope* *

Project supported by the National Key R&D Program of China (Grant Nos. 2016YFA0300901 and 2017YFA0205003), the National Natural Science Foundation of China (Grant Nos. 11634001 and 21725302), and the Key Research Program of the Chinese Academy of Sciences (Grant No. XDPB08-1).

Guo Chaoyu¹, Meng Xiangzhi¹, Wang Qin¹, Jiang Ying^{1, 2, 3, †}

(color online) (a) A positive charge (green) in the sample at a distance z from a metal tip can induce negative image charge (red) in the tip. (b) Schematic of band edge shift in TiO₂ as the metal tip approaches the surface arising from the image charge effect. The dash/solid arrow indicates an electron injected into/extracted from the conduction band/defect states of TiO₂.