Noise and transport characterization of single molecular break junctions with individual molecule

Sydoruk, V. A.; Dong, Xiaopeng; Vitusevich, S. А.; Petrychuk, M. V.; Vladyka, Anton; Zhang, Yi; Offenhäusser, Andreas; Kochelap, V. A.; Belyaev, A. E.; Mayer, Dirk

doi:10.1063/1.4736558

Cited by 31 publications

(40 citation statements)

References 36 publications

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“…It is well-known that π-conjugated single molecules adsorbed onto noble metal electrodes such as fcc Au, Ag, Cu, or Pt, diffuse and form a two-dimensional ordered film at 300 K [20,[22][23][24][25]. Because the molecules move across the noble metal electrode surface, in break-junction measurements, the single molecule can "fit" between the two electrodes [32][33][34][35][36][37][38]. Noble metal surfaces, in which mainly s or p states are dominant near the Fermi energy (E F ), interact weakly with the molecule, essentially through the process of physisorption.…”

Section: Introductionmentioning

confidence: 99%

Role of π−d hybridization in a 300-K organic-magnetic interface: Metal-free phthalocyanine single molecules on a bcc Fe(001) whisker

et al. 2016

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The realization of single molecular electronics is considered the next frontier to addressing and sustaining the storage needs of the future. In order to realize a single molecular device working at 300 K, two conditions must be satisfied: firstly, there must be no molecular diffusion, i.e., robust bonding between molecules and the contacting electrode, and secondly, stable electronic interface states. In this study, using a combination of 7-K and 300-K ultrahigh vacuum scanning tunneling microscopy/spectroscopy experiments and theoretical ab-initio calculations, we investigated the adsorption of π-conjugated metal-free phthalocyanine (Pc) single molecules onto an Fe(001) whisker single crystal along with the resulting electronic interface structures. The Pc/Fe(001) system was found to prevent molecular diffusion even at 300 K, due to strong adsorption as well as the presence of a larger diffusion barrier than that of the Pc/Ag(001) system, in which molecules are known to diffuse at 300 K. The origin of such a robust bonding was studied by recovering the sample local density of states (LDOS) with the normalized (dI/dV)/T curves, which LDOS peaks are successfully explained by theoretical calculations.

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Section: Introductionmentioning

confidence: 99%

Role of π−d hybridization in a 300-K organic-magnetic interface: Metal-free phthalocyanine single molecules on a bcc Fe(001) whisker

et al. 2016

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“…Both cases show a 1/ f -distribution at low frequencies. Reference [33] characterized the noise in the voltage across a gold-wire break-junction in vacuum at room temperature. Both in the presence and absence of a molecule in the junction, at high frequencies the power spectrum of the voltage is identical to the spectrum of thermal (Johnson-Nyquist) noise.…”

Section: Experimental Noisementioning

confidence: 99%

Classification of DNA nucleotides with transverse tunneling currents

et al. 2016

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It has been theoretically suggested and experimentally demonstrated that fast and low-cost sequencing of DNA, RNA, and peptide molecules might be achieved by passing such molecules between electrodes embedded in a nanochannel. The experimental realization of this scheme faces major challenges, however. In realistic liquid environments, typical currents in tunnelling devices are of the order of picoamps. This corresponds to only six electrons per microsecond, and this number affects the integration time required to do current measurements in real experiments. This limits the speed of sequencing, though current fluctuations due to Brownian motion of the molecule average out during the required integration time. Moreover, data acquisition equipment introduces noise, and electronic filters create correlations in time-series data. We discuss how these effects must be included in the analysis of, e.g., the assignment of specific nucleobases to current signals. As the signals from different molecules overlap, unambiguous classification is impossible with a single measurement. We argue that the assignment of molecules to a signal is a standard pattern classification problem and calculation of the error rates is straightforward. The ideas presented here can be extended to other sequencing approaches of current interest.

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“…In partitioned approaches, the lead-molecule coupling and the bias are added to the Hamiltonian at t 0 simultaneously [58]. This is unlike the situation in real experiments, where the leads equilibrate with the molecule prior to the bias switch-on time t 0 [59], making a partition-free approach a necessity for an accurate description of the transient regime. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Fluctuating-bias controlled electron transport in molecular junctions

2016

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We consider the problem of transport through a multiterminal molecular junction in the presence of a stochastic bias, which can also be used to describe transport through fluctuating molecular energy levels. To describe these effects, we first make a simple extension of our previous work [Phys. Rev. B 91, 125433 (2015)] to show that the problem of tunneling through noisy energy levels can be mapped onto the problem of a noisy driving bias, which appears in the Kadanoff-Baym equations for this system in an analogous manner to the driving term in the Langevin equation for a classical circuit. This formalism uses the nonequilibrium Green's function method to obtain analytically closed formulas for transport quantities within the wide-band limit approximation for an arbitrary time-dependent bias and it is automatically partition free. We obtain exact closed formulas for both the colored and white noise-averaged current at all times. In the long-time limit, these formulas possess a Landauer-Büttiker-type structure which enables the extraction of an effective transmission coefficient for the transport. Expanding the Fermi function into a series of simple poles, we find an exact formal relation between the parameters which characterize the bias fluctuations and the poles of the Fermi function. This enables us to describe the effect of the temperature and the strength of the fluctuations on the averaged current which we interpret as a quantum analog to the classical fluctuation-dissipation theorem. We use these results to convincingly refute some recent results on the multistability of the current through a fluctuating level, simultaneously verifying that our formalism satisfies some well-known theorems on the asymptotic current. Finally, we present numerical results for the current through a molecular chain which demonstrate a transition from nonlinear to linear I -V characteristics as the strength of fluctuations is increased, as well as a stochastic resonance effect in the conductance of this system.

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Noise and transport characterization of single molecular break junctions with individual molecule

Cited by 31 publications

References 36 publications

Role of π−d hybridization in a 300-K organic-magnetic interface: Metal-free phthalocyanine single molecules on a bcc Fe(001) whisker

Role of π−d hybridization in a 300-K organic-magnetic interface: Metal-free phthalocyanine single molecules on a bcc Fe(001) whisker

Classification of DNA nucleotides with transverse tunneling currents

Fluctuating-bias controlled electron transport in molecular junctions

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