Device structure for electronic transport through individual molecules using nanoelectrodes

Ghosh, Subhasis; Halimun, Henny; Mahapatro, Ajit K.; Choi, Jaewon; Lodha, Saurabh; Janes, David B.

doi:10.1063/1.2140470

Cited by 53 publications

(40 citation statements)

References 21 publications

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“…[83] While more recently, it has been well utilized to fabricate nanogap electrodes for nanodevices. [84][85][86][87][88][89] The passage of a large density current or application of a large direct current (dc) voltage to the thin metal wire predefined by electron-beam lithography would cause the electromigration of metal atoms and eventual breakage of the nanowire. This process can yield a stable electrode separation of 1 nm with high efficiency [84] and it can be monitored in real time by observing the current-voltage characteristics until only a tunneling signal is present.…”

Section: Electromigration For Nanogap Electrodesmentioning

confidence: 99%

Nanogap Electrodes

2009

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Nanogap electrodes (namely, a pair of electrodes with a nanometer gap) are fundamental building blocks for the fabrication of nanometer‐sized devices and circuits. They are also important tools for the examination of material properties at the nanometer scale, even at the molecular scale. In this review, the techniques for the fabrication of nanogap electrodes, the preparation of assembled devices based on the nanogap electrodes, and the potential application of these nanodevices for analysis of material properties are introduced. The history, the research status, and the prospects of nanogap electrodes are also discussed.

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Section: Electromigration For Nanogap Electrodesmentioning

confidence: 99%

Nanogap Electrodes

2009

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“…Depending on the experimental setup, measured conductances vary between 10 −4 G 0 and 10 −1 G 0 [41,42,43,44,45], while the calculated values typically lie in the range (0.05 − 0.4) G 0 [3,13,16,17,18,46,47,48]. In general it has been found that the transmission function is strongly dependent on the bonding site of the S atom [18,47], while variations in the Au-S bond length only affects the transmission function weakly [46].…”

Section: Benzene-14-dithiol (Bdt) Between Au(111) Surfacesmentioning

confidence: 99%

Benchmark density functional theory calculations for nanoscale conductance

Strange

Kristensen

Thygesen

et al. 2008

The Journal of Chemical Physics

117

122

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We present a set of benchmark calculations for the Kohn-Sham elastic transmission function of five representative single-molecule junctions. The transmission functions are calculated using two different density functional theory (DFT) methods, namely an ultrasoft pseudopotential plane wave code in combination with maximally localized Wannier functions, and the norm-conserving pseudopotential code Siesta which applies an atomic orbital basis set. For all systems we find that the Siesta transmission functions converge toward the plane-wave result as the Siesta basis is enlarged. Overall, we find that an atomic basis with double-zeta and polarization is sufficient (and in some cases even necessary) to ensure quantitative agreement with the plane-wave calculation. We observe a systematic down shift of the Siesta transmission functions relative to the plane-wave results. The effect diminishes as the atomic orbital basis is enlarged, however, the convergence can be rather slow.

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“…However, the assembly of molecular structures in junctions for electric and magnetic manipulation is a challenging task. [1][2][3][4] Carbon nanotubes (CNTs) are particularly promising as building blocks of new devices for nanoelectronics, [5][6][7][8] which exhibit interesting spin properties [9][10][11][12] and can be useful for quantum information processing. 13,14 Fundamental aspects of single-molecule devices require an understanding of strong perturbations by environmental effects, for example, the interaction with contacts or neighboring molecules.…”

mentioning

confidence: 99%

Spin-dependent electronic hybridization in a rope of carbon nanotubes

et al. 2011

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We demonstrate single-electron addition to different strands of a carbon nanotube rope. Anticrossings of anomalous conductance peaks occur in quantum transport measurements through the parallel quantum dots forming on the individual strands. We determine the magnitude and the sign of the hybridization as well as the Coulomb interaction between the carbon nanotube quantum dots, finding that the bonding states dominate the transport. In a magnetic field the hybridization is shown to be selectively suppressed due to spin effects. Molecular electronics and spintronics aim at exploiting the chemical versatility of molecules to control charge and magnetism in nanoscale devices. However, the assembly of molecular structures in junctions for electric and magnetic manipulation is a challenging task.1-4 Carbon nanotubes (CNTs) are particularly promising as building blocks of new devices for nanoelectronics, 5-8 which exhibit interesting spin properties 9-12 and can be useful for quantum information processing.13,14 Fundamental aspects of single-molecule devices require an understanding of strong perturbations by environmental effects, for example, the interaction with contacts or neighboring molecules. 15 These interactions can, in principle, be studied on a single-molecule level using scanning probe techniques as for instance scanning near-field optical microscopy, 16 tip-enhanced Raman spectroscopy 17,18 or scanning tunneling spectroscopy (STS). 19 However, in situ characterization of actual devices, for example, field-effect transistors, is difficult to implement and only STS can detect spin-dependent phenomena.As an alternative approach, one may exploit the differential electrostatic gating effect, which was found to occur for contacted CNTs filled with fullerenes 20 and for single molecules in nanojunctions. 15 In this respect, bundled CNTs are interesting: Within a rope one expects the strands to be at a different potential and to respond differently to the external electric fields due to electrostatic effects. 21 Low-temperature transport spectroscopy is sensitive to these potential variations on the sub-meV scale, allowing the study of interactions between coupled nanoscale conductors.In this Rapid Communication we show that transport spectroscopy can resolve both charge addition to individual strands of a single CNT rope as well as the coupling between these strands caused by molecular interactions. We determine the hybridization and the electrostatic interaction between parallel quantum dots (QDs) forming on the different strands. We extract both the magnitude and the sign of the hybridization and find that current transport occurs via the bonding states of the coupled QD system. Furthermore, by applying a magnetic field the electronic hybridization is selectively suppressed due to spin effects. This offers prospects for accessing individual charge and spin degrees of freedom in coupled carbon-based molecular systems.The CNTs of the reported device were grown on a Si/SiO 2 substrate by chemical vapor deposition ...

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Device structure for electronic transport through individual molecules using nanoelectrodes

Abstract: Conformations and charge transport characteristics of biphenyldithiol self-assembled-monolayer molecular electronic devices: A multiscale computational study Theoretical investigation on electron transport through an organic molecule: Effect of the contact structure

Cited by 53 publications

References 21 publications

Nanogap Electrodes

Nanogap Electrodes

Benchmark density functional theory calculations for nanoscale conductance

Spin-dependent electronic hybridization in a rope of carbon nanotubes

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