Ultrahigh vacuum, variable temperature, dual scanning tunneling microscope system operating under high magnetic field

Area of Science:

• Surface science
• Nanotechnology
• Condensed matter physics

Background:

• Scanning tunneling microscopy (STM) is crucial for atomic-scale surface characterization.
• Investigating materials under extreme conditions (low temperature, high magnetic field) requires advanced instrumentation.
• Precise control over sample orientation relative to magnetic fields is essential for anisotropic property studies.

Purpose of the Study:

• To introduce a novel Dual Scanning Tunneling Microscope (DSTM) system.
• To enable simultaneous atomic-resolution imaging and nanoscale transport measurements.
• To facilitate studies under variable temperature (2.2 K to room temperature) and high magnetic fields (up to 12 T).

Main Methods:

• The DSTM system integrates two independent STM units with piezoelectric positioners and capacitive sensors.
• The system operates in ultrahigh vacuum to ensure surface cleanliness.
• A split-coil superconducting magnet allows for magnetic field strengths up to 12 T.
• The DSTM and sample configuration permits continuous variation of magnetic field orientation from normal to parallel to the sample surface.

Main Results:

• The DSTM achieves atomic resolution, demonstrating its capability for high-precision imaging.
• Independent operation of each STM unit is confirmed.
• The system successfully integrates transport measurement capabilities, forming a nanometer-scale three-terminal setup.
• The design allows for versatile magnetic field manipulation relative to the sample.

Conclusions:

• The developed DSTM system is a versatile platform for advanced surface science and condensed matter physics research.
• It enables correlated nanoscale imaging and transport measurements under extreme conditions.
• The ability to tune magnetic field orientation opens new avenues for exploring anisotropic electronic properties.