Switching Between One and Two Dimensions: Conductivity of Pb-Induced Chain Structures on Si(557)

Tegenkamp, Christoph; Kallassy, Z.; Pfnür, H.; Günter, H.‐L.; Zielasek, Volkmar; Henzler, M.

doi:10.1103/physrevlett.95.176804

Cited by 97 publications

(78 citation statements)

References 23 publications

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“…The EDC curves at 100 K, shown are just examples, demonstrate a more or less uniform distribution of the DOS close to E F in k space. Correspondingly, the Pb chains become two-dimensionally conducting above T c , as observed [10,11]. The repeated zone structures are still visible in ARPES (not shown), but with the slightly smaller g vectors, as also found in our structural studies [20].…”

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confidence: 82%

“…The Pb=Si557 system is unique in this respect since macroscopic conductance measurements [10,11] reveal a slightly anisotropic temperature activated conductance above T c 78 K. Below this temperature the conductance switches reversibly to quasi-1D and metallic along the step direction, while in the perpendicular direction conductance is indistinguishable from the residual conductance of the substrate. In contrast to all systems exhibiting quasi 1D-conductance properties investigated so far, this system turns into a quasi-1D metallic conductance state at low temperatures with no indications of further instabilities.…”

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confidence: 99%

“…[10]. The Pb monolayer (ML) was prepared by Pb evaporation at T 100 K followed by annealing to 640 K for several minutes to ensure full multilayer desorption and rearrangement of the step structure.…”

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Coupled Pb Chains on Si(557): Origin of One-Dimensional Conductance

et al. 2008

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The Pb=Si557 system exhibits a strong anisotropy in conductance below 78 K, with the evolution of a characteristic chain structure. Here we show, using angle-resolved photoemission, that chain ordering results in complete Fermi-like nesting in the direction normal to the chains; in addition, the domain structure along the chains forms split-off valence bands with mesoscopic Fermi wavelengths which induce the 1D conductance without further instabilities at low temperatures. DOI: 10.1103/PhysRevLett.100.076802 PACS numbers: 73.20.At, 68.65.ÿk, 73.21.ÿb, 73.25.+i Confinement of electrons in low-dimensional structures induces intriguing transport phenomena and electronic properties. This scenario of strongly interacting electrons is described within the framework of a Luttinger liquid (LL) rather than by a Fermi liquid (FL) [1]. In an intuitive picture, this changeover is intimately related to the geometry of the structure; i.e., the interaction between electrons is enhanced in low-dimensional systems. An obvious strategy of making one-dimensional (1D) conductors is to use anisotropic solid state bulk materials like Bechgaard salts [2,3] or, as shown recently, Ca 2 Ru 2 O 7 [4,5]. Anisotropic adsorbate structures, realized on (vicinal) surfaces, are even more flexible, because the structure can be controlled on an atomic scale, and the electronic structure can be changed gradually by varying the degree of localization, e.g., by changing terrace widths. Submonolayer coverages of Ag and Au on vicinal Si(111) surfaces form chain structures showing indeed localized states perpendicular to the chain direction [6 -8]. However, these weakly interacting systems often undergo instabilities, e.g., Peierls-or Mott-Hubbard driven phase transitions into insulating states at low temperature (see, e.g., [9] ), and the 1D character of charge carriers is rarely established in transport measurements.The Pb=Si557 system is unique in this respect since macroscopic conductance measurements [10,11] reveal a slightly anisotropic temperature activated conductance above T c 78 K. Below this temperature the conductance switches reversibly to quasi-1D and metallic along the step direction, while in the perpendicular direction conductance is indistinguishable from the residual conductance of the substrate. In contrast to all systems exhibiting quasi 1D-conductance properties investigated so far, this system turns into a quasi-1D metallic conductance state at low temperatures with no indications of further instabilities.This intriguing behavior requires an explanation in terms of the interplay of the geometric and electronic structure across the phase transition. Here using angleresolved photoemission (ARPES), we demonstrate that the interplay of the overlayer structure and the substrate leads to an electronically stabilized arrangement of chain structures and has direct consequences on the formation and filling of electronic bands that results in the observed transport properties. In particular, we demonstrate 1D conductance is a direct co...

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Coupled Pb Chains on Si(557): Origin of One-Dimensional Conductance

et al. 2008

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“…[5][6][7][8] Since for semiconductor heterostructures with ultralow electron concentrations Fermi wavelengths can be of the order of 100 nm, size quantization or Coulomb blockade ͑CB͒ effects are comparably easy to observe in these systems at low temperature. Consequently, the detailed structure of interfaces and defects on the atomic scale are only of minor relevance and, thus, ͑Ohmic͒ contacts for transport studies are well defined on this length scale.…”

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Coulomb blockade effects in Ag/Si(111): The role of the wetting layer

2009

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Single and double barrier structures have been realized with Ag nanostructures grown on Si͑111͒ in combination with scanning tunneling microscopy. The series connection of a Schottky ͑SB͒ and tunneling barrier mimics a double barrier structure showing Coulomb blockade oscillations as revealed by scanning tunneling spectroscopy ͑STS͒. Although the SB remains in presence of a Ag ͱ 3 ϫ ͱ 3 reconstruction, the dI / dV characteristic turns into a single barrier structure. The Ag reconstruction provides a sufficiently high electron mobility capturing intrinsic defects which shortens the resistance of the SB. These results show that vertical transport properties, as measured with STS, are not only controlled by the structure and the bonding on the atomic scale, but depend strongly on the lateral properties of the interface as well.

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“…as seen for Pb/Si(557). For this system, strong coupling of adjacent wires has revealed 1D transport due to Fermi nesting in the direction across the wires, however, the role of SOC in this system was not taken into account so far [12,13].…”

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confidence: 99%