Influence of Na adsorption on the quantum conductance and metal-insulator transition of the In-Si(111)(4×1)–(8×2) nanowire array

W. G. Schmidt, M. Babilon, C. Thierfelder, S. Sanna, and S. Wippermann
Phys. Rev. B 84, 115416 – Published 14 September 2011

Abstract

Density functional theory calculations are performed to study the influence of Na adatoms on the electron transport and structural properties of the In-Si(111)(4×1)–(8×2) nanowire array. It is found that there are several energetically nearly degenerate Na adsorption sites, the precise energetic ordering of which depends on the surface coverage. Irrespective of the adsorption site, the adatoms show mainly a repulsive interaction with little indications for long-range correlation. The calculations show only a moderate disturbance of the quantum conductance of the metallic room-temperature (4×1) In nanowire phase upon Na adsorption. Also, the electronic density of states at the Fermi energy is only slightly modified. However, it is found that adsorption-induced strain as well as charge donation into the In nanowires lead to a noticeable decrease of the metal-insulator transition temperature. Therefore, Na adsorption on the semiconducting (8×2) In nanowire phase may trigger a transition into the metallic state.

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  • Received 26 May 2011

DOI:https://doi.org/10.1103/PhysRevB.84.115416

©2011 American Physical Society

Authors & Affiliations

W. G. Schmidt, M. Babilon, C. Thierfelder, S. Sanna, and S. Wippermann

  • Lehrstuhl für Theoretische Physik, Universität Paderborn, D-33095 Paderborn, Germany

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Issue

Vol. 84, Iss. 11 — 15 September 2011

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