Electronic transport in planar atomic-scale structures measured by two-probe scanning tunneling spectroscopy

Marek Kolmer 1, 2 Pedro Brandimarte 3 Jakub Lis 1 Rafal Zuzak 1 Szymon Godlewski 1 Hiroyo Kawai 4 Aran Garcia-Lekue 5, 6 Nicolas Lorente 7, 8 Thomas Frederiksen 3, 6 Christian Joachim 9 Daniel Sánchez-Portal 5, 8 Marek Szymonski 1
1 NANOAM - Centre for Nanometer-Scale Science and Advanced Materials
2 CNMS - Center for Nanophase Materials Sciences [Oak Ridge]
3 Donostia International Physics Center - DIPC (SPAIN)
4 A*STAR - Agency for science, technology and research [Singapore]
5 Donostia International Physics Center - DIPC (SPAIN)
6 Ikerbasque - Basque Foundation for Science
7 SESSTIM - U912 INSERM - Aix Marseille Univ - IRD - Sciences Economiques et Sociales de la Santé & Traitement de l'Information Médicale
8 Center of Materials Physics CSIC-UPV / EHU and Donostia International Physics Center
9 CEMES-GNS - Groupe NanoSciences
CEMES - Centre d'élaboration de matériaux et d'études structurales
Abstract : Miniaturization of electronic circuits into the single-atom level requires novel approaches to characterize transport properties. Due to its unrivaled precision, scanning probe microscopy is regarded as the method of choice for local characterization of atoms and single molecules supported on surfaces. Here we investigate electronic transport along the anisotropic germanium (001) surface with the use of two-probe scanning tunneling spectroscopy and first-principles transport calculations. We introduce a method for the determination of the transconductance in our two-probe experimental setup and demonstrate how it captures energy-resolved information about electronic transport through the unoccupied surface states. The sequential opening of two transport channels within the quasi-one-dimensional Ge dimer rows in the surface gives rise to two distinct resonances in the transconductance spectroscopic signal, consistent with phase-coherence lengths of up to 50 nm and anisotropic electron propagation. Our work paves the way for the electronic transport characterization of quantum circuits engineered on surfaces.
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Submitted on : Monday, June 24, 2019 - 3:16:40 PM
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UNIV-AMU | U1252 | UNIV-TLSE3 | CEMES | GNS | INSA-TOULOUSE | INSA-GROUPE | IRD | INC-CNRS

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Marek Kolmer, Pedro Brandimarte, Jakub Lis, Rafal Zuzak, Szymon Godlewski, et al.. Electronic transport in planar atomic-scale structures measured by two-probe scanning tunneling spectroscopy. Nature Communications, Nature Publishing Group, 2019, 10 (1), ⟨10.1038/s41467-019-09315-6⟩. ⟨hal-02160083⟩

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