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Cryogenic amplifier with high sensitivity and stability for noise-STM.

Maialen Ortego Larrazabal1,2, Jiasen Niu1,3,4,5, Jian-Feng Ge1,6

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We developed a new high-resolution noise amplifier for scanning tunneling microscopy (STM). This breakthrough improves noise resolution by over 20x, enabling detailed studies of quantum materials and electron temperature.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Scanning tunneling microscopy (STM) is crucial for atomic-scale electronic property investigation.
  • Local shot noise spectroscopy offers direct insight into tunneling charge dynamics.
  • Weak noise signals and spurious noise necessitate high-resolution amplifiers in STM.

Purpose of the Study:

  • To introduce a novel high-resolution noise amplifier for STM.
  • To enhance the sensitivity and resolution of local noise measurements.
  • To enable new investigations into quantum materials and electron temperature.

Main Methods:

  • Development and implementation of a new high-resolution noise amplifier.
  • Integration of the amplifier into three distinct STM systems.
  • Characterization of noise resolution improvement and effective charge sensitivity.

Main Results:

  • Achieved over a 20-fold improvement in noise resolution compared to previous generations.
  • Demonstrated the capability to resolve effective charge values as low as 0.01e.
  • Successfully implemented the amplifier in multiple STM setups.

Conclusions:

  • The new amplifier significantly advances local noise spectroscopy capabilities in STM.
  • Opens avenues for studying novel quantum materials like d-wave superconductors.
  • Provides direct local electron temperature measurements in STM experiments.