Initial stages of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Pt</mml:mi></mml:mrow></mml:math>growth on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ge</mml:mi><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>studied by scanning tunneling microscopy and density functional theory

Gürlü, O.; Zandvliet, Henricus J.W.; Poelsema, Bene; Dağ, S.; Çiraci, S.

doi:10.1103/physrevb.70.085312

Cited by 29 publications

(21 citation statements)

References 26 publications

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“…This buckling bears close resemblance to the substrate zigzag in the presence of nanowires. Despite the plain Ge surface being modified by dilute incorporation of Pt atoms [43], a direct relation to the dimer spacing of the adjacent nanowires exists, suggestive of a substrate-driven origin of the nanowire dimers. In other words, it appears that the nanowires are formed along the dimer rows of the substrate, a process which may be referred to as template-driven nanowire formation.…”

Section: Structure With Stmmentioning

confidence: 99%

Self-organized atomic nanowires of noble metals on Ge(001): atomic structure and electronic properties

et al. 2009

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Self-organized atomic nanowires of noble metals on Ge(001): atomic structure and electronic properties Abstract. Atomic structures of quasi-one-dimensional (1D) character can be grown on semiconductor substrates by metal adsorption. Significant progress concerning study of their 1D character has been achieved recently by condensing noble metal atoms on the Ge(001) surface. In particular, Pt and Au yield high quality reconstructions with low defect densities. We report on the self-organized growth and the long-range order achieved, and present data from scanning tunneling microscopy (STM) on the structural components. For Pt/Ge(001), we find hot substrate growth is the preferred method for self-organization. Despite various dimerized bonds, these atomic wires exhibit metallic conduction at room temperature, as documented by low-bias STM. For the recently discovered Au/Ge(001) nanowires, we have developed a deposition technique that allows complete substrate coverage. The Au nanowires are extremely well separated spatially, exhibit a continuous 1D charge density, and are of solid metallic conductance. In this review, we present structural details for both types of nanowires, and discuss similarities and differences. A perspective is given for their potential to host a 1D electron system. The ability to condense different noble metal nanowires demonstrates how atomic control of the structure affects the electronic properties.

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Section: Structure With Stmmentioning

confidence: 99%

Self-organized atomic nanowires of noble metals on Ge(001): atomic structure and electronic properties

et al. 2009

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“…The top atomic chains seemingly exhibit dimerization which becomes small for tunnel bias close to the Fermi level [8]. The electronic states observed within scanning tunneling microscopy (STM) are interpreted to be related to Pt states [2,5,7,8] or quantization of electron states between wires [5,9]. The scanning tunneling spectroscopy (STS) results indicate a metallic conductivity of the wires at zero bias [2,8].…”

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confidence: 99%

Atomic Nanowires on thePt/Ge(001)Surface: Buried Pt-Ge Versus Top Pt-Pt Chains

Stekolnikov¹,

Bechstedt²,

Wiśniewski

et al. 2008

Phys. Rev. Lett.

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Combining total-energy calculations, electronic-structure studies, and scanning tunneling microscopy (STM), we demonstrate that the observed one-dimensional nanowires are composed of Pt-induced Ge structures instead of Pt chains. Pt-Ge bonds are favored versus Pt-Pt ones. The novel tetramer-dimer-chain model explains STM features and the differential conductivity. The conduction path is related to the chain of alternating Pt-Ge atoms.

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“…3 Some experimental studies, however, aimed at producing the atomic chains on a substrate. 20 Here the substrate-chain interaction can enter as an additional degree of freedom to influence the physical properties.…”

Section: Introductionmentioning

confidence: 99%

Structural, electronic, and magnetic properties of3dtransition metal monatomic chains: First-principles calculations

et al. 2008

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In this paper we investigated structural, electronic, and magnetic properties of 3d ͑light͒ transition metal atomic chains using first-principles pseudopotential plane-wave calculations. Infinite periodic linear, dimerized linear, and planar zigzag chain structures, as well as their short segments consisting of finite number of atoms have been considered. Like Cu, the periodic, linear chains of Mn, Co, and Ni correspond to a local shallow minimum. However, for most of the infinite periodic chains, neither linear nor dimerized linear structures are favored; to lower their energy the chains undergo a structural transformation to form planar zigzag and dimerized zigzag geometries. Dimerization in both infinite and finite chains is much stronger than the usual Peierls distortion and appears to depend on the number of 3d electrons. As a result of dimerization, a significant energy lowering occurs which, in turn, influences the stability and physical properties. Metallic linear chain of vanadium becomes half-metallic upon dimerization. Infinite linear chain of scandium also becomes half-metallic upon transformation to the zigzag structure. An interplay between the magnetic ground state and the atomic as well as the electronic structure of the chain has been revealed. The end effects influence the geometry, the energetics, and the magnetic ground state of the finite chains. Structure optimization performed using noncollinear approximation indicates significant differences from the collinear approximation. Variation of the cohesive energy of infinite-and finite-size chains with respect to the number of 3d electrons is found to mimic the well-known bulk behavior. The spin-orbit coupling of finite chains is found to be negligibly small.

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Initial stages ofPtgrowth onGe(001)studied by scanning tunneling microscopy and density functional theory

Cited by 29 publications

References 26 publications

Self-organized atomic nanowires of noble metals on Ge(001): atomic structure and electronic properties

Self-organized atomic nanowires of noble metals on Ge(001): atomic structure and electronic properties

Atomic Nanowires on thePt/Ge(001)Surface: Buried Pt-Ge Versus Top Pt-Pt Chains

Structural, electronic, and magnetic properties of3dtransition metal monatomic chains: First-principles calculations

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