Electronic properties; Tomanaga Luttinger liquid; Scanning tunneling microscopy; Self-assembly; One dimensional systems; Tunneling spectroscopy; Single atom chains; 1D transport
Villarreal Renan, Kirkham Christopher J., Scarfato Alessandro, Bowler David R., Renner Christoph (2019), Towards surface diffusion potential mapping on atomic length scale, in Journal of Applied Physics
, 125(18), 184301-184301.
Longobardi M., Kirkham C. J., Villarreal R., Köster S. A., Bowler D. R., Renner Ch. (2017), Electronic coupling between Bi nanolines and the Si(001) substrate: An experimental and theoretical study, in Physical Review B
, 96(23), 235421-235421.
Kirkham C. J., Longobardi M., Köster S. A., Renner Ch., Bowler D. R. (2017), Subatomic electronic feature from dynamic motion of Si dimer defects in Bi nanolines on Si(001), in Physical Review B
, 96(7), 075304-075304.
Villarreal R, Longobardi M., Köster S. A., Bowler D. R., Kirkham Ch., Renner Ch. (2015), Structure of self-assembled Mn atom chains on Si(001), in Physical Review Letter
, 115, 256104.
The objectives of this three year project are to measure the electronic transport properties of an atomic-scale one-dimensional (1D) wire and its local electronic structure. Theory of 1D physics is in many respects ahead of experiment, with a number of predictions still awaiting verification due to the difficulties developing a suitable experimental 1D model system. We have synthesized three atomic-scale candidate systems on Si(001) to study how electrons behave under such extreme quantum confinement conditions. The Bi-nanoline, the Haiku stripe and Haiku dangling bond rows we propose to study offer a range of unique features to address electronic transport in one dimension, quite different from other 1D systems considered in the past: they grow long enough to attach current and voltage probes to an individual atomic-scale nanoline; their atomic structure is known in great details, which is paramount for meaningful transport and spectroscopy data analysis; they are perfectly straight with a constant width over micrometer distances; they grow on flat terraces, independent of any step edges; they are stable in UHV up to 500°C - the Haiku stripe can even be exposed to air at room temperature; finally, they sit on Si(001), a wide band gap semiconductor minimizing the coupling of the low energy 1D states with substrate bulk states. The initial challenge of the proposal is to achieve proper electrical contacts to individual nanolines. Once this has been realized, we shall be looking for characteristic signatures of 1D electrons in temperature dependent STM imaging, tunneling spectra and transport measurements - including characteristic noise, real space charge patterns, quantized conductance and power law dependencies. We shall also attempt to characterize the nanolines using spin polarized STM and other techniques, such as photoemission spectroscopy, optical conductivity and SQUID magnetometry.