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Conductance

About: Conductance is a research topic. Over the lifetime, 8088 publications have been published within this topic receiving 235961 citations.


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Journal ArticleDOI
TL;DR: Simulations based on nonequilibrium Green's function formalism suggest that the origin of this asymmetry in transport in graphene devices doped with poly(ethylene imine) and diazonium salts is imbalanced carrier injection from the graphene electrodes caused by misalignment of the electrode and channel neutrality points.
Abstract: We investigate poly(ethylene imine) and diazonium salts as stable, complementary dopants on graphene. Transport in graphene devices doped with these molecules exhibits asymmetry in electron and hole conductance. The conductance of one carrier is preserved, while the conductance of the other carrier decreases. Simulations based on nonequilibrium Greenʼs function formalism suggest that the origin of this asymmetry is imbalanced carrier injection from the graphene electrodes caused by misalignment of the electrode and channel neutrality points.

445 citations

Journal ArticleDOI
TL;DR: This work provides an unambiguous determination of single DNA conductance and demonstrates different conduction mechanisms for different sequences.
Abstract: We have studied electron transport in DNA duplexes, covalently bonded to two electrodes in aqueous buffer solutions, by repeatedly forming a large number of DNA junctions. The histogram of conductances reveals peaks at integer multiples of a fundamental value, which is used to identify with the conductance of a single DNA molecule. The measured conductance depends on the DNA sequence and length. For (GC)n sequences, the conductance is inversely proportional to the length (greater than eight base pairs). When inserting (A:T)m into GC-rich domains, it decreases exponentially with the length of A:T base pairs (m) with a decay constant of 0.43 A-1. This work provides an unambiguous determination of single DNA conductance and demonstrates different conduction mechanisms for different sequences.

431 citations

Journal ArticleDOI
TL;DR: It is shown explicitly that differences in local structure have a limited influence on conductance because the amine-Au bonding motif is well-defined and flexible, explaining the narrow distributions seen in the experiments.
Abstract: A combination of theory and experiment is used to quantitatively understand the conductance of single-molecule benzenediamine−gold junctions. A newly developed analysis is applied to a measured junction conductance distribution, based on 59 000 individual conductance traces, which has a clear peak at 0.0064 G0 and a width of ±47%. This analysis establishes that the distribution width originates predominantly from variations in conductance across different junctions rather than variations in conductance during junction elongation. Conductance calculations based on density functional theory (DFT) for 15 distinct junction geometries show a similar spread. We show explicitly that differences in local structure have a limited influence on conductance because the amine−Au bonding motif is well-defined and flexible, explaining the narrow distributions seen in the experiments. The minimal impact of junction structure on conductance permits an unambiguous comparison of calculated and measured conductance values an...

430 citations

Journal ArticleDOI
10 Aug 2007-Science
TL;DR: This work studied heat transport through self-assembled monolayers of long-chain hydrocarbon molecules anchored to a gold substrate by ultrafast heating of the gold with a femtosecond laser pulse.
Abstract: At the level of individual molecules, familiar concepts of heat transport no longer apply. When large amounts of heat are transported through a molecule, a crucial process in molecular electronic devices, energy is carried by discrete molecular vibrational excitations. We studied heat transport through self-assembled monolayers of long-chain hydrocarbon molecules anchored to a gold substrate by ultrafast heating of the gold with a femtosecond laser pulse. When the heat reached the methyl groups at the chain ends, a nonlinear coherent vibrational spectroscopy technique detected the resulting thermally induced disorder. The flow of heat into the chains was limited by the interface conductance. The leading edge of the heat burst traveled ballistically along the chains at a velocity of 1 kilometer per second. The molecular conductance per chain was 50 picowatts per kelvin.

423 citations

Journal ArticleDOI
TL;DR: In this paper, the thermal conductance associated with electron-phonon coupling in a metal near a metal-nonmetal interface can be estimated as hep=Gkp, where G is the volumetric electron and phonon or lattice thermal conductivity of the metal.
Abstract: We theoretically show that the thermal conductance associated with electron–phonon coupling in a metal near a metal–nonmetal interface can be estimated as hep=Gkp, where G is the volumetric electron–phonon coupling constant and kp is the phonon or lattice thermal conductivity of the metal. The expression suggests hep≈1/T at temperatures comparable to the Debye temperature of the metal. The predicted values of hep fall within the range of conductance values experimentally observed (0.3–1 GW/m2 K), suggesting that it cannot be ignored, and could even play a dominant role at high temperatures. Predictions of the total thermal conductance, that include both electron–phonon and phonon–phonon interfacial conductances, show reasonable agreement in its temperature dependence with experimental data for TiN/MgO interfaces.

421 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023457
2022828
2021154
2020158
2019172
2018168