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Atomically resolved STM imaging with a diamond tip: simulation and experiment.

V Grushko1, O Lübben, A N Chaika

  • 1V Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, 2, Avtozavodskaya Str., Kiev, 04074, Ukraine.

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Summary
This summary is machine-generated.

Scanning tunneling microscopy (STM) achieves enhanced spatial resolution using conductive diamond probes. These probes enable sub-Ångström imaging by leveraging carbon atomic orbitals for high-precision tunneling current measurements.

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Area of Science:

  • Materials Science
  • Surface Science
  • Scanning Probe Microscopy

Background:

  • Scanning tunneling microscopy (STM) resolution is limited by probe characteristics.
  • Light element-terminated probes offer potential for enhanced spatial resolution.
  • Conductive diamond probes possess suitable atomic orbitals for high-resolution imaging.

Purpose of the Study:

  • To demonstrate high spatial resolution in STM using single-crystal diamond tips.
  • To investigate the optimal conditions for achieving atomic resolution with diamond probes.
  • To explore the utility of diamond tips, typically used in atomic force microscopy, for STM.

Main Methods:

  • Experimental STM imaging using a heavily boron-doped diamond probe on a graphite surface.
  • Density functional theory (DFT) calculations for tip and surface electronic structure.
  • First-principles calculations of tunneling current.

Main Results:

  • High spatial resolution achieved with single-crystal diamond tips in STM.
  • Optimal resolution observed at tip-sample distances of 3-5 Å, correlating with p-orbital contribution.
  • Atomic resolution demonstrated even at very small gaps with significant tunneling current noise.

Conclusions:

  • Single-crystal diamond tips are effective for achieving high spatial resolution in STM.
  • The electronic structure, specifically frontier p-orbitals, dictates resolution at specific tip-sample distances.
  • Diamond probes offer a viable alternative for high-resolution STM, expanding their application beyond atomic force microscopy.