TY - JOUR

T1 - Extrinsic doping on the atomic scale

T2 - Tuning metallicity in atomic Au chains

AU - Mamiyev, Zamin

AU - Sanna, S.

AU - Lichtenstein, Timo

AU - Tegenkamp, Christoph

AU - Pfnür, Herbert

N1 - Funding information: We gratefully acknowledge financial support from the DFG in the research unit FOR 1700 (projects E4 and T1) and Niedersächsisches Ministerium für Wissenschaft und Kultur through the graduate school “contacts in nanosystems.” 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-Universität Gießen.

PY - 2018/12/17

Y1 - 2018/12/17

N2 - Understanding the response of low-dimensional electronic systems to external perturbations is of great interest for fundamental science as well as future applications. Here we employ plasmon spectroscopy to study the modification of metallicity in Au-induced quantum wires on the Si(553) surface by hydrogenation. The present study shows that no direct bond formation to the Au chains is necessary for controllable modifications of metallicity. Instead, changes in band structure of the whole system by H adsorbed at the Si step edges suffice via indirect interaction, as proven by the quantitative agreement between first-principles calculations and the unoccupied band structure derived from plasmon spectroscopy. Interestingly, simple electron donation has a similar effect as hydrogen adsorption at the step edges with respect to the Au bands and the dimerization of the Au chains.

AB - Understanding the response of low-dimensional electronic systems to external perturbations is of great interest for fundamental science as well as future applications. Here we employ plasmon spectroscopy to study the modification of metallicity in Au-induced quantum wires on the Si(553) surface by hydrogenation. The present study shows that no direct bond formation to the Au chains is necessary for controllable modifications of metallicity. Instead, changes in band structure of the whole system by H adsorbed at the Si step edges suffice via indirect interaction, as proven by the quantitative agreement between first-principles calculations and the unoccupied band structure derived from plasmon spectroscopy. Interestingly, simple electron donation has a similar effect as hydrogen adsorption at the step edges with respect to the Au bands and the dimerization of the Au chains.

UR - http://www.scopus.com/inward/record.url?scp=85058663146&partnerID=8YFLogxK

U2 - 10.1103/physrevb.98.245414

DO - 10.1103/physrevb.98.245414

M3 - Article

AN - SCOPUS:85058663146

VL - 98

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 24

M1 - 245414

ER -