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Figure 1. Schematic of a conventional scanning tunneling microscope (STM).

3. A. 2. 6. 5. 4. 1. Figure 1. Schematic of a conventional scanning tunneling microscope (STM). Figure Captions for Figs. 1 and 2 Atomic structure of the sample surface Single-atom probing tip Scanning control system Electronic control circuit Electrical bias

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Figure 1. Schematic of a conventional scanning tunneling microscope (STM).

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  1. 3 A 2 6 5 4 1 Figure 1. Schematic of a conventional scanning tunneling microscope (STM).

  2. Figure Captions for Figs. 1 and 2 Atomic structure of the sample surface Single-atom probing tip Scanning control system Electronic control circuit Electrical bias Electronic feedback circuit Electron wave functions of the surface atoms of the sample Electron wave function of the protruding atom of the probing tip 1 2 3 4 5 6 7 8

  3. 8 7 Figure 2. Schematic of the mechanism of interaction between electron wave functions of the conventional probe tip and sample surface.

  4. 3 A 2 6 5 4 1 Figure 3. Schematic of the coherent dual-tip scanning probe microscope.

  5. Figure Captions for Figs. 3 and 4 Atomic structure of the sample surface The coherent dual-tip probe with two coherent atomic tips Scanning control system Electronic control circuit Electrical bias Electronic feedback circuit Electron wave functions of the surface atoms of the sample Electron wave functions of the protruding atoms of the dual-tip probe The pattern of interferenced electron wave functions from two coherent atomic tips provides a high-contrast and high-resolution probe. 1 2 3 4 5 6 7 8 9

  6. 8 q 9 7 Figure 4. Schematic of the mechanism of interaction between electron wave functions of the coherent dual-tip probe and sample surface.

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