Installed in 2018, the state-of-the-art 4-probe STM system is dedicated to the determination of electronic transport properties in a variety of systems at scales ranging from several micrometers down to single-atom level. The atomic resolution of each of the four probes allows both STM and transport measurements to establish correlation of transport properties with atomic structurers and density of states. Equipped with spin-sensitive probes, the system is the only spin-polarized 4-probe STM in the world for spin-polarized transport experiment. It combines spin-polarized STM with four-probe transport measurements with probes navigated by SEM in the same UHV platform.
FEATURES:
• Four independent STM probes with atomic resolution (sub-Angstrom stability at 4.5K)
• Standard 2- and 4-probe transport setups with probe separation down to 30nm
• Scanning Tunneling Potentiometry (STP) capabilities
• Operating Temperatures: 4.5K to 300K
• Long liquid helium holding time (up to ~40 hrs)
• Gemini column SEM imaging with 20nm resolution
• Qplus non-contact AFM
• Magnetic field up to 20 mT (at 4.5 K)
• Magnetic tips for spin-polarized STM and transport measurements
• Up to 4 additional electrical contacts at the microscope sample stage
• In-situ Low energy electron diffraction (LEED)
• In situ sample preparation in UHV chamber (~10-10 torr)
• Sample preparation with
• resistive heater (120K-1200K)
• in-situ sample cleaving
• Sputtering ion gun
• Controlled gas exposures
• Effusion cells for organic/inorganic materials deposition
