| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2016) | |
| Nanomaterials | Tuesday Sessions |
| Session NM-TuM |
| Session: | Nanofabrication and Nanodevices I |
| Presenter: | Rafal Zuzak, Jagiellonian University, Poland |
| Authors: | S. Godlewski, Jagiellonian University, Poland R. Zuzak, Jagiellonian University, Poland M. Kolmer, Jagiellonian University, Poland M. Engelund, Donostia International Physics Center, Spain H. Kawai, Institute of Materials Research and Engineering, Singapore G. Dridi, CEMES-CNRS, France A. Garcia-Lekue, Donostia International Physics Center, Spain C. Joachim, CEMES-CNRS, France D. Sanchez-Portal, Donostia International Physics Center, Spain M. Szymonski, Jagiellonian University, Poland |
| Correspondent: | Click to Email |
In recent years we observe an increasing interest in the precise atomic-scale fabrication of surface nanostructures. This is because the miniaturization of various electronic devices has pushed many fundamental research efforts toward creating atomic-scale circuits [1]. Among different substrates, the hydrogen passivated silicon and germanium surfaces are regarded as the promising ones due to the fact that they allow precise fabrication of complex dangling bond (DB) nanostructures, which introduce new electronic states within the intrinsic band gap of the substrate [2]. These structures could be further utilized in fabrication of atomic scale devices [3] or may be directly applied in quantum circuitry.
In the presentation we will describe fabrication of various surface DB nanostructures. Their geometrical and electronic properties will be analysed on the basis of scanning tunnelling microscopy/spectroscopy (STM/STS) measurements corroborated by density functional theory (DFT) calculations. We will show that upon electron/hole injection dangling bonds exhibit dynamical behaviour, which due to the high frequency of oscillations leads to smooth STM appearance. A new imaging model, based on a dynamical two-state rate equation, which allows detailed reproduction of observed STM pattern will be introduced [4]. Moreover, the influence of single dangling bond charging on the STS spectra will be analysed [5]. We will further envision that our new model might be applied to simulate other bi-stable systems where fluctuations arise from transiently charged electronic states. Finally, we will present successful design and construction of the first prototypical QHC (Quantum Hamiltonian Computing) atomic scale Boolean logic gate operated by the STM tip [6].
[1] M. Fuechsle et al. Nat. Nanotechnol., 7, 2012, 242–246
[2] M. Kolmer et al. Phys. Rev. B 86, 2012, 125307
[3] B. Weber et al. Ohm’s Law Survives to the Atomic Scale. Science 335, 2012, 64–67
[4] M. Engelund et al. Phys. Chem. Chem. Phys. , 2016, 18, 19309
[5] M. Engelund et al. Scientific Reports 2015, 5, 14496
[6] M. Kolmer et al. Nanoscale 2015, 7 12325
This research was supported by the National Science Centre, Poland (contract no. UMO-2014/15/D/ST3/02975) and the 7th Framework Programme of the European Union Collaborative Project PAMS (contract no.610446).