Integer conductance quantization of gold atomic sheets

Kurui, Yoshihiko; Oshima, Yoshifumi; Okamoto, Masakuni; Takayanagi, Kunio

doi:10.1103/physrevb.77.161403

Cited by 13 publications

(17 citation statements)

References 31 publications

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“… carried out simulations based on density‐functional theory (DFT) and showed that a typical breaking neck shrinks sequentially as a hexagonal NW, a triangular NW, a two‐dimensional ladder, and finally a chain of atoms but shows no icosahedral structures. As similar neck evolutions of Au NWs have been really observed by transmission electron microscopy , the results of DFT‐based simulations appear plausible and suggest the overproduction of INWs in previous simulations. Nevertheless, considering a multitude of break‐junction experiments made in the past, one experimental report of Cu INWs () still appears too few to be accounted for.…”

Section: Resultssupporting

confidence: 80%

Formation of icosahedral nanowires

Fujita

Kurokawa

Sakai

2016

Physica Status Solidi (b)

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An icosahedral nanowire (INW) is a one‐dimensional structure where a single atom and a five‐membered ring are alternating to form a −1−5−1−5−1− stacking. The 1−5−1−5−1 segment of this stacking forms an icosahedron and constitutes the unit cell of an INW. In molecular dynamics (MD) simulations of stretching of metal nanowires (NWs), INWs are frequently formed at their deformation necks. Previous simulations found that the formation of INWs is more favored for thin NWs than thick NWs. To closely investigate this size dependence of INW formation, we have carried out stretching simulations of Mg NWs and examined the creation of icosahedral arrangement of atoms at their deformation necks. Our results show that thin NWs tend to produce slender necks, the atoms of which first become disordered and then rearrange themselves into an icosahedral arrangement. Thick nanowires rarely form such slender necks and this accounts for their low yield of INWs. We have also investigated a continuous and bond‐conserving process that converts the HCP arrangement of atoms into an icosahedral one. We found that the nearest‐neighbor bonds are not conserved and only a small fraction of nearest‐neighbor atoms in an icosahedral unit cell are initially nearest neighbors.

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Section: Resultssupporting

confidence: 80%

Formation of icosahedral nanowires

Fujita

Kurokawa

Sakai

2016

Physica Status Solidi (b)

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“…The surfaces of both electrodes were cleaned by strong electron-beam irradiation (the current density was 3 pA/nm 2 ) as reported previously. 20,21 After electron-beam irradiation, the narrow contact between two electrodes shows quantized conductance, 22,23 which is evidence that no residual contaminants exist on the electrode surfaces. However, sometimes residual carbon contamination exists because carbon atoms engage in strong covalent bonding.…”

Section: Experimental Methodsmentioning

confidence: 98%

Strong gold atom strands formed by incorporation of carbon atoms

et al. 2011

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Single metal atom strands have attracted significant interest because of their unique properties, such as quantization effects and a high degree of strength. Recently it was suggested that the strength of a gold atom strand can be enhanced by the insertion of an impurity atom, but it has not been experimentally investigated. Using a transmission electron microscope under ultrahigh vacuum conditions, we observed that gold atoms were pulled out one by one from a carbon-contaminated gold (111) surface to form a long atom strand. The strand was so strong that it did not break even upon bending. Supported by first-principles calculations, the strand was found to have two carbon atoms at each gold atom interval. Our observations suggest that the carbon atoms act as a glue to form a long gold atom strand.

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“…Since the discovery of beautiful low-dimensional carbon nanostructures, such as fullerene, [ 1 ] carbon nanotubes and graphene, [ 2,3 ] tremendous efforts have been devoted to exploring similar nanostructures for transition metals (TMs) and exploiting their potential applications in electronic devices and selective catalysis. [4][5][6][7][8][9][10] To date, various carbon-like lowdimensional TM, particularly in Group VIIIB and IB, nanostructures have been successfully realized. For example, Huang et al proved the existence of Au nanocages with similar structures as fullerenes as shown by photoelectron absorption experiments and fi rst principles calculations.…”

Section: Doi: 101002/advs201500314mentioning

confidence: 99%

Formation and Stability of Low‐Dimensional Structures for Group VIIIB and IB Transition Metals: The Role of sd⁴ Hybridization

et al. 2016

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A quasi‐sd4 hybridization state for group VIIIB and IB face‐centered cubic (FCC) transition metals in low‐dimensional nanostructures is identified, in contrast to the sd5 hybridization state in bulk. For Au, a novel three‐shelled nanowire is designed with a hexagonal close‐packed core in the sd5 hybridization, wrapped by FCC‐(111) shell that adopts the quasi‐sd4 hybridization. This new nanostructure exhibits remarkable stability and electronic properties.

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Integer conductance quantization of gold atomic sheets

Cited by 13 publications

References 31 publications

Formation of icosahedral nanowires

Formation of icosahedral nanowires

Strong gold atom strands formed by incorporation of carbon atoms

Formation and Stability of Low‐Dimensional Structures for Group VIIIB and IB Transition Metals: The Role of sd⁴ Hybridization

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Integer conductance quantization of gold atomic sheets

Cited by 13 publications

References 31 publications

Formation of icosahedral nanowires

Formation of icosahedral nanowires

Strong gold atom strands formed by incorporation of carbon atoms

Formation and Stability of Low‐Dimensional Structures for Group VIIIB and IB Transition Metals: The Role of sd4 Hybridization

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Product

Resources

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Formation and Stability of Low‐Dimensional Structures for Group VIIIB and IB Transition Metals: The Role of sd⁴ Hybridization