Conductance step for a single-atom contact in the scanning tunneling microscope: Noble and transition metals

Sirvent, C.; Rodrigo, José A.; Vieira, S.; Jurczyszyn, L.; Mingo, Natalio; Flóres, F.

doi:10.1103/physrevb.53.16086

Cited by 103 publications

(104 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] This artificial one-dimensional arrangement of single atoms is unstable; gold ͑Au͒ ASWs survive for up to 2 ms at a retraction speed of ϳ10 nm/ s. On the basis of similarity in surface reconstruction, it is proposed that ASWs of the single metallic elements, platinum ͑Pt͒ and iridium ͑Ir͒, also possess structural stability comparable to that of Au ASWs. The formation process of ASWs during thinning of NCs has been investigated in relation to their quantized conductance defined by a quantum ͑G 0 =2e 2 / h, where e is the electron charge and h is Planck's constant͒.…”

Section: Introductionmentioning

confidence: 99%

“…15 In conductance histograms of Pt and Ir NCs, peaks are not observed at quantized values, and the peaks are wider than those of Au NCs. 4,6,7,13,[29][30][31][32][33][34][35][36][37] The deviation from quantized values is interpreted on the basis of inelastic scattering of electrons at 5d orbitals. 13,33,38,39 A relationship between the conductance and length of ASWs was reported; for Au, Pt, and Ir ASWs, their conductance oscillates depending on parity in the number of constituent atoms.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

Kizuka

Monna

2009

Phys. Rev. B

View full text Add to dashboard Cite

Platinum ͑Pt͒ wires of single-atom width were produced by the retraction of a Pt nanotip from contact with a Pt plate at room temperature inside a transmission electron microscope. The distance between the nanotip and the plate was controlled using a conductance feedback system, as a result of which wires showing certain conductance values were observed continuously by in situ lattice imaging. Simultaneously, the force acting on the wires was measured using a function of atomic force microscopy. The tip-plate distance was also increased with a constant speed, and the atomic configuration, force, and conductance were similarly investigated. The single-atom-width Pt wires were found to exhibit straight shapes with an interatomic distance of 0.28Ϯ 0.03 nm. The wires were stable at a tensile force of approximately 1 nN; the observed interatomic distance resulted from elastic expansion. The present study demonstrated experimental evidence for the relationship between wire length and conductance; the wires extend from a three-atom length to a five-atom length as the selected feedback conductance decreases from 2.0 to 0.5G 0 ͑where G 0 =2e 2 / h, e being the charge of an electron and h Planck's constant͒. Contacts exhibiting a conductance of 3.0G 0 were two-atom-width contacts. In a conductance histogram constructed from the simple retraction, only one peak was observed at 1.3G 0 . Thus, it was found that the conductance of single-atom-width Pt wires is less than 3.0G 0 , with 1.3G 0 being that of the most-stable state.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

Kizuka

Monna

2009

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Therefore, in single gold atom junctions, T is one. When transition metals are used as electrodes, not only are they easily oxidized, but their d orbitals are used for the single atom junctions and SMJ orbitals; this means that several electron paths are used, which complicates the conductance behavior in the junction; 53,66,67 as such, gold electrodes are preferred.…”

Section: Single-molecule Analysis Methodsmentioning

confidence: 99%

Single-Molecule Analysis Methods Using Nanogap Electrodes and Their Application to DNA Sequencing Technologies

Taniguchi

2017

Bulletin of the Chemical Society of Japan

View full text Add to dashboard Cite

Single-molecule analysis methods facilitate the investigation of the properties of single-molecule junctions (SMJs), in which single molecules are connected between a pair of nanoelectrodes that use nanogap electrodes having a spacing of less than several nanometers. Various methods have been developed to investigate numerous useful parameters for SMJs; for example, the number of molecules connected between a pair of nanoelectrodes can be determined, the types and structures of single molecules can be revealed, localized temperatures within SMJs can be evaluated, and the Seebeck coefficient and the bond strength between single molecules and electrodes can be ascertained. Single-molecule analysis methods have also been used to analyze biopolymers in solutions, and this has resulted in single-molecule sequencing technologies being developed that can determine sequences of base molecules in DNA and RNA along with sequences of amino acids in peptides. Singlemolecule analysis methods are expected to develop into digital analysis techniques that can be used to investigate the physical and chemical properties of molecules at single-molecule resolutions.

show abstract

“…Consequently, the relationship between the NC structure and the conductance has been predicted on the basis of calculations using simple hypothetical models. 7,11,12,14) However, the structural origin of the nonquantization of conductance remains unclear. In situ transmission electron microscopy (TEM) enables the direct observation of structural variations in NCs with the simultaneous measurement of their conductance, 26) and thus can be applied to NCs that do not exhibit conductance quantization.…”

Section: Introductionmentioning

confidence: 99%

Plastic Flowlike Deformation and Its Relation to Aperiodic Peaks in Conductance Histograms of Molybdenum Nanocontacts

Yamada

Kizuka

2016

J. Phys. Soc. Jpn.

View full text Add to dashboard Cite

We observed the tensile deformation of molybdenum (Mo) nanocontacts (NCs) and simultaneously measured their conductance by in situ transmission electron microscopy. During deformation, the contact width decreased from several nanometers to a single-atom size. Mo NCs were thinned via a plastic flowlike deformation process. The process differs from the slip on lattice planes, which is frequently observed in NCs made of noble metals. We plotted histograms of the time-conductance traces measured during the tensile deformation of Mo NCs. In the conductance histograms, we observed peaks at 1.8G 0 (G 0 ＝2e 2 /h, where e is the electron charge and h is Planck's constant), 3.6G 0 , and 4.4G 0 . When the minimum conductance (1.8G 0 ) was measured, the minimum cross-sectional widths of the NCs were 3-7 atoms. These NCs exhibited relaxed structures that formed irregularly after the plastic flowlike deformation occurred in the final stage of the tensile process. We inferred that the aperiodic peaks observed in the conductance histograms originated from irregular variations in the contact areas and atomic configurations of the NCs during the plastic flowlike deformation.Moreover, the conductance value of the single-atom contacts was less than 0.1G 0 .

show abstract

Conductance step for a single-atom contact in the scanning tunneling microscope: Noble and transition metals

Cited by 103 publications

References 20 publications

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

Atomic configuration, conductance, and tensile force of platinum wires of single-atom width

Single-Molecule Analysis Methods Using Nanogap Electrodes and Their Application to DNA Sequencing Technologies

Plastic Flowlike Deformation and Its Relation to Aperiodic Peaks in Conductance Histograms of Molybdenum Nanocontacts

Contact Info

Product

Resources

About