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Gating the charge state of single Fe dopants in the topological insulator Bi 2 Se 3 with a scanning tunneling microscope

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posted on 2024-11-15, 14:35 authored by Canli Song, Yeping Jiang, Yi-Lin Wang, Zhi Li, Lili Wang, Ke He, Xi Chen, Xu-Cun Ma, Qi-Kun Xue
Low-temperature scanning tunneling microscope (STM) is exploited to study directly the atomic and electronic structures of single Fe dopants in topological insulator Bi2Se3 thin films. Fe atoms predominantly and isovalently substitute for two distinct Bi sites at the subsurface with charge neutrality. In the vicinity of Fe substitutions, circular depressions in STM topography and sharp rings in spatially resolved conductance map, whose diameters apparently depend on the tunneling conditions, are observed. We show that the phenomena correlate well with the switching between Fe3+ and Fe2+ charge states due to the gate effect of the tunneling tip, as further evidenced by a multidopant system.

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Citation

Song, C., Jiang, Y., Wang, Y., Li, Z., Wang, L., He, K., Chen, X., Ma, X. & Xue, Q. (2012). Gating the charge state of single Fe dopants in the topological insulator Bi 2 Se 3 with a scanning tunneling microscope. Physical Review B: Condensed Matter and Materials Physics, 86 045441-1-045441-4.

Journal title

Physical Review B - Condensed Matter and Materials Physics

Volume

86

Issue

4

Language

English

RIS ID

115290

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