TY - JOUR

T1 - Charge-transfer transition in Au-induced quantum wires on Si(553)

AU - Edler, Frederik

AU - Miccoli, Ilio

AU - Pfnür, Herbert

AU - Tegenkamp, Christoph

N1 - Funding information: We gratefully acknowledge the fruitful discussions with B. Hafke and M. Horn-von Hoegen (University of Duisburg–Essen, Germany), C. Braun and W. Gero Schmidt (University of Paderborn, Germany), S. Sanna (University of Gießen, Germany), as well as the financial support by the Deutsche Forschungsgemeinschaft through our Research Unit FOR1700 (Project Te/386 10-2).

PY - 2019/7/24

Y1 - 2019/7/24

N2 - The Si(553)-Au system resembles a heteroatomic chain ensemble with a delicate spin-charge interplay. The ordering of the ×3 reconstruction vanishes via a phase transition taking place at Tc=100 K. Our directional-dependent surface transport measurements showed that this order-disorder phase transition is not driven by the formation of a charge-density wave, as previously suggested. Instead, at 65 K there is a pronounced increase of the surface-state conductivity along the wires. We attribute this to activated charge transfer between the localized Si dangling bond states and the proximate Au bands revealing a ×2 periodicity. Apparently, a quasiorthogonality between the wave functions of the two proximal reconstructions is also responsible for a missing ×6 periodicity along the wires. The electronic charge transfer is in agreement with recent band-structure calculations.

AB - The Si(553)-Au system resembles a heteroatomic chain ensemble with a delicate spin-charge interplay. The ordering of the ×3 reconstruction vanishes via a phase transition taking place at Tc=100 K. Our directional-dependent surface transport measurements showed that this order-disorder phase transition is not driven by the formation of a charge-density wave, as previously suggested. Instead, at 65 K there is a pronounced increase of the surface-state conductivity along the wires. We attribute this to activated charge transfer between the localized Si dangling bond states and the proximate Au bands revealing a ×2 periodicity. Apparently, a quasiorthogonality between the wave functions of the two proximal reconstructions is also responsible for a missing ×6 periodicity along the wires. The electronic charge transfer is in agreement with recent band-structure calculations.

UR - http://www.scopus.com/inward/record.url?scp=85070452710&partnerID=8YFLogxK

U2 - 10.1103/physrevb.100.045419

DO - 10.1103/physrevb.100.045419

M3 - Article

AN - SCOPUS:85070452710

VL - 100

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 4

M1 - 045419

ER -