2006•Japanese Journal of Applied PhysicsOpen access

Low Temperature Scanning Tunneling Microscopy and Scanning Tunneling Spectroscopy Study at the α-Sn/Ge(111) Surface

F. Ronci, Stefano Colonna, Stephen D. Thorpe, A. Cricenti, G. Le Lay

Abstract

A scanning tunneling microscopy (STM) study of the α-Sn/Ge(111) at low temperature is presented. The scanning tunneling spectroscopy (STS) measurements of the surface evidenced a metallic character from the room temperature down to the 3 × 3 transition temperature. The fluctuation model for the √3 × √3 reconstruction is confirmed by dynamical measurements of the tunneling current on top the Sn adatoms. The STM tip was used as a probe to verify the presence of oscillating Sn adatoms by studying the tunneling current as a function of time.

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Key concepts: Scanning tunneling microscope, Scanning tunneling spectroscopy, Spin polarized scanning tunneling microscopy, Quantum tunnelling, Electrochemical scanning tunneling microscope, Spectroscopy, Scanning probe microscopy, Transition metal