TY - JOUR

T1 - How One-Dimensional Are Atomic Gold Chains on a Substrate?

AU - Sanna, S.

AU - Lichtenstein, Timo

AU - Mamiyev, Zamin

AU - Tegenkamp, Christoph

AU - Pfnür, Herbert

N1 - Funding information: We gratefully acknowledge financial support from the Deutsche Forschungsgemeinschaft in the research unit FOR 1700. The Höchstleistungrechenzentrum Stuttgart (HLRS) is gratefully acknowledged for grants of high-performance computer time. We acknowledge computational resources provided by the HPC Core Facility and the HRZ of the Justus-Liebig-Universita? Gießen.

PY - 2018/10/18

Y1 - 2018/10/18

N2 - One-dimensional (1D) wires are inherently unstable but can be stabilized by three-dimensional (3D) interaction with their environment, resulting in two-dimensional (2D) and 3D hybridization of 1D electronic states. The relevance of these interactions, which is still under debate, is exemplified by the prototypical Si(553)-Au system investigated here. This system forms double atomic 1D chains on each mini-terrace for the high-coverage phase, whereas in the low-coverage phase every second terrace is empty. The relevance of hybridization is demonstrated by the complete breakdown of the nearly free electron gas model, as revealed from plasmon dispersion. Nevertheless, the combined approach consisting of plasmon spectroscopy and first-principles calculations allows for a consistent and almost quantitative description. It further demonstrates that plasmon spectroscopy contains important information about the excitation spectrum of an electronic system. Because the coupling of the Au wires with higher dimensions through the substrate cannot be neglected, the wires are more appropriately described as an extremely anisotropic 2D object than as purely 1D.

AB - One-dimensional (1D) wires are inherently unstable but can be stabilized by three-dimensional (3D) interaction with their environment, resulting in two-dimensional (2D) and 3D hybridization of 1D electronic states. The relevance of these interactions, which is still under debate, is exemplified by the prototypical Si(553)-Au system investigated here. This system forms double atomic 1D chains on each mini-terrace for the high-coverage phase, whereas in the low-coverage phase every second terrace is empty. The relevance of hybridization is demonstrated by the complete breakdown of the nearly free electron gas model, as revealed from plasmon dispersion. Nevertheless, the combined approach consisting of plasmon spectroscopy and first-principles calculations allows for a consistent and almost quantitative description. It further demonstrates that plasmon spectroscopy contains important information about the excitation spectrum of an electronic system. Because the coupling of the Au wires with higher dimensions through the substrate cannot be neglected, the wires are more appropriately described as an extremely anisotropic 2D object than as purely 1D.

UR - http://www.scopus.com/inward/record.url?scp=85056377329&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.8b08600

DO - 10.1021/acs.jpcc.8b08600

M3 - Article

AN - SCOPUS:85056377329

VL - 122

SP - 25580

EP - 25588

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 44

ER -