Müllegger Group


Single Atom Radio Frequency Fingerprinting: The "6th Sense" for STM

Modern nanoscience approaches the atomic scale: Individual atoms, rather than ensembles, carry the functionalities of man-made devices (switching, storing, calculating, catalyzing, etc). While single-atom imaging is routine since the advent of the scanning tunneling microscope (STM) in the ‘80s, their chemical identification is difficult. My group develops a “6th sense” that turns the STM from an imaging- to an identification tool with atomic resolution.

Low-temperature scanning tunneling microscopy and -spectroscopy (STS) are the methods of choice for studying electronic and geometric properties of matter at the atomic scale. We develop the low-temperature STM technique towards the detection of radio frequency signals up to several GHz. Our present focus is single-spin spectroscopy with sub-nanometer spatial resolution.


  • Radio Frequency Scanning Tunneling Spectroscopy (rf-STS)
  • Molecule-Based Hybrid Nanostructures
  • Experimental Nanophysics


Former group members:
Dominik Farka (PostDoc, 2018)
Jeffrey Schuster (Master, 2018)
Giulia Serrano (PostDoc, 2016). Thereafter postdoc fellow in Roberta Sessoli's group at University of Firenze.
Stefano Tebi (PhD 2016)
Stefan Wiespointner (Master, 2016)
Karlheinz Mayr (Bachelor, 2013)
Michael Fattinger (Master, 2013)
Thomas Lengauer (Diploma, 2010)
Mohammad Rashidi (PhD, 2009-2013). Thereafter postdoc fellow in Bob Wolkow's group at University of Alberta.


ERC Consolidator Grant
Funded by: European Research Council (ERC)
Title: Single Atom Radio Frequency Fingerprinting (SARF)
Principal investigator: Stefan Müllegger
Duration: 2018-2023

LIT Advanced Project, LIT-2016-1-ADV-002
Funded by: Linz Institute of Technology (LIT) and Land Oberösterreich,
Title: Single-atom radio frequency fingerprinting (SARF²)
Principal investigator: Stefan Müllegger
Duration: 2017-2019

Open positions (last update Feb 2019):

I am constantly looking for proactive and enthusiastic students to join my group. I offer various possibilities for conducting bachelor, master or PhD thesis. At your request I am able to offer flexible working conditions and multidisciplinary topics. For further inquiries please write to

Open positions:

  • 2 PhD student positions (3 years) on radio-frequency scanning tunneling microscopy, see EURAXESS #381263
  • Postdoc position on radio-frequency scanning tunneling microscopy, see EURAXESS #381333


  • Wolfgang Schöfberger, Institute of Organic Chemistry, Johannes Kepler Univeristy Linz, Austria.
  • Wolf Gero Schmidt and Uwe Gerstmann, Festkörperptheorie, Department Physik, Universität Paderborn, Germany.
  • Ivo Stary, Institute of Organic Chemistry and Biochemistry ASCR, Prague, Czech Republic.
  • Johannes Barth and Florian Klappenberger, Physik Department, Technische Universität München, Germany.
  • Yishay Manassen, Department of Physics, Ben Gurion University of the Negev
  • Eva Rauls, Department of Mathematics and Natural Science, University of Stavanger, Norway.
  • Mario Ruben, Karlsruhe Institute of Technology (KIT), Germany.