Low noise, flexible control system for Quasiparticle Interference measurements by low-temperature Scanning Tunnelling Microscopy

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Scanning tunneling microscopy and spectroscopy (STM and STS) is a powerful tool for understanding structure and electronic properties of materials on the nanoscale. Developments in equipment stability and noise have enabled new methods that further link the atomic-scale real-space picture that emerges from STM data to reciprocal space through so-called "Quasiparticle Interference" (QPI) measurements by exploiting scattering from defects. This method allows detailed comparison of surface structure and real-space electronic states with the band structure, and with advances in stability and noise, has been most recently been demonstrated to directly reveal information regarding many-body effects that underlie some of the most exciting problems in materials physics today. The combination of this many-body probe, with the ability to determine structure and select distinct surface terminations even on inhomogenous surfaces, offers a unique view that area-averaged methods such as angle-resolved photoemission cannot.