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Tracking molecular resonance forms of donor-acceptor push-pull molecules by single-molecule conductance experiments

Lissau, H. (author), Frisenda, R. (author), Olsen, S.T. (author), Jevric, M. (author), Parker, C.R. (author), Kadziola, A. (author), Hansen, T. (author), Van der Zant, H.S.J. (author), Brondsted Nielsen, M. (author), Mikkelsen, K.V. (author)

The ability of molecules to change colour on account of changes in solvent polarity is known as solvatochromism and used spectroscopically to characterize charge-transfer transitions in donor–acceptor molecules. Here we report that donor–acceptor-substituted molecular wires also exhibit distinct properties in single-molecule electronics under...

journal article 2015

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Probing the local environment of a single OPE3 molecule using inelastic tunneling electron spectroscopy

Frisenda, R. (author), Perrin, M.L. (author), Van der Zant, H.S.J. (author)

We study single-molecule oligo(phenylene ethynylene)dithiol junctions by means of inelastic electron tunneling spectroscopy (IETS). The molecule is contacted with gold nano-electrodes formed with the mechanically controllable break junction technique. We record the IETS spectrum of the molecule from direct current measurements, both as a...

journal article 2015

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Observing the semiconducting band-gap alignment of MoS2 layers of different atomic thicknesses using a MoS2/SiO2/Si heterojunction tunnel diode

Nishiguchi, K. (author), Castellanos-Gomez, A. (author), Yamaguchi, H. (author), Fujiwara, A. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)

We demonstrate a tunnel diode composed of a vertical MoS2/SiO2/Si heterostructure. A MoS2 flake consisting four areas of different thicknesses functions as a gate terminal of a silicon field-effect transistor. A thin gate oxide allows tunneling current to flow between the n-type MoS2 layers and p-type Si channel. The tunneling-current...

journal article 2015

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Single-Molecule Break Junctions Based on a Perylene-Diimide Cyano-Functionalized (PDI8-CN2) Derivative

Frisenda, R. (author), Parlato, L. (author), Barra, M. (author), Van der Zant, H.S.J. (author), Cassinese, A. (author)

In this letter, we report the single-molecule conductance properties of a cyano-functionalized perylene-diimide derivative (PDI8-CN 2 ) investigated with gold nano-electrodes. This molecule is of large interest for the fabrication of high-performance and air-stable n-type organic field-effect transistors. Low-bias experiments performed on...

journal article 2015

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High-quality-factor tantalum oxide nanomechanical resonators by laser oxidation of TaSe2

Cartamil Bueno, S.J. (author), Steeneken, P.G. (author), Tichelaar, F.D. (author), Navarro Moratalla, E. (author), Venstra, W.J. (author), Leeuwen, R. (author), Coronado, E. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author), Castellanos-Gomez, A. (author)

Controlling the strain in two-dimensional (2D) materials is an interesting avenue to tailor the mechanical properties of nanoelectromechanical systems. Here, we demonstrate a technique to fabricate ultrathin tantalum oxide nanomechanical resonators with large stress by the laser oxidation of nano-drumhead resonators composed of tantalum...

journal article 2015

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Electrical properties and mechanical stability of anchoring groups for single-molecule electronics

Frisenda, R. (author), Tarkuc, S. (author), Galan, E. (author), Perrin, M.L. (author), Eelkema, R. (author), Grozema, F.C. (author), Van der Zant, H.S.J. (author)

We report on an experimental investigation of transport through single molecules, trapped between two gold nano-electrodes fabricated with the mechanically controlled break junction (MCBJ) technique. The four molecules studied share the same core structure, namely oligo(phenylene ethynylene) (OPE3), while having different aurophilic anchoring...

journal article 2015

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Superconducting molybdenum-rhenium electrodes for single-molecule transport studies

Gaudenzi, R. (author), Island, J.O. (author), De Bruijckere, J. (author), Burzuri, E. (author), Klapwijk, T.M. (author), Van der Zant, H.S.J. (author)

We demonstrate that electronic transport through single molecules or molecular ensembles, commonly based on gold (Au) electrodes, can be extended to superconducting electrodes by combining gold with molybdenum-rhenium (MoRe). This combination induces proximity-effect superconductivity in the gold to temperatures of at least 4.6K and magnetic...

journal article 2015

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Electron-vibron coupling effects on electron transport via a single-molecule magnet

McCaskey, A. (author), Yamamoto, Y. (author), Warnock, M. (author), Burzuri, E. (author), Van der Zant, H.S.J. (author), Park, K. (author)

We investigate how the electron-vibron coupling influences electron transport via an anisotropic magnetic molecule, such as a single-molecule magnet (SMM) Fe4, by using a model Hamiltonian with parameter values obtained from density-functional theory (DFT). The magnetic anisotropy parameters, vibrational energies, and electron-vibron coupling...

journal article 2015

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Probing transverse magnetic anisotropy by electronic transport through a single-molecule magnet

Misiorny, M. (author), Burzuri, E. (author), Gaudenzi, R. (author), Park, K. (author), Leijnse, M. (author), Wegewijs, M.R. (author), Paaske, J. (author), Cornia, A. (author), Van der Zant, H.S.J. (author)

By means of electronic transport, we study the transverse magnetic anisotropy of an individual Fe4 singlemolecule magnet (SMM) embedded in a three-terminal junction. In particular, we determine in situ the transverse anisotropy of the molecule from the pronounced intensity modulations of the linear conductance, which are observed as a function...

journal article 2015

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Nonlinear dynamics of a microelectromechanical oscillator with delayed feedback

Van Leeuwen, R. (author), Karabacak, D.M. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)

We study the dynamics of a nonlinear electromechanical oscillator with delayed feedback. Compared to their linear counterparts, we find that the dynamics is dramatically different. The well-known Barkhausen stability criterion ceases to exist, and two modes of operation emerge: one characterized by hysteresis in combination with a bistable...

journal article 2013

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Wide-bandwidth charge sensitivity with a radio-frequency field-effect transistor

Nishiguchi, K. (author), Yamaguchi, H. (author), Fujiwara, A. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)

We demonstrate high-speed charge detection at room temperature with single-electron resolution by using a radio-frequency field-effect transistor (RF-FET). The RF-FET combines a nanometer-scale silicon FET with an impedance-matching circuit composed of an inductor and capacitor. Driving the RF-FET with a carrier signal at its resonance frequency...

journal article 2013

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Submicrosecond-timescale readout of carbon nanotube mechanical motion

Meerwaldt, H.B. (author), Johnston, S.R. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)

We report fast readout of the motion of a carbon nanotube mechanical resonator. A close-proximity high electron mobility transistor amplifier is used to increase the bandwidth of the measurement of nanotube displacements from the kHz to the MHz regime. Using an electrical detection scheme with the nanotube acting as a mixer, we detect the...

journal article 2013

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Quantum interference effects at room temperature in OPV-based single-molecule junctions

Arroyo Rodriguez, C. (author), Frisenda, R. (author), Moth-Poulsen, K. (author), Seldenthuis, J.S. (author), Bjornholm, T. (author), Van der Zant, H.S. (author)

Interference effects on charge transport through an individual molecule can lead to a notable modulation and suppression on its conductance. In this letter, we report the observation of quantum interference effects occurring at room temperature in single-molecule junctions based on oligo(3)-phenylenevinylene (OPV3) derivatives, in which the...

journal article 2013

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Strongly coupled modes in a weakly driven micromechanical resonator

Venstra, W.J. (author), Van Leeuwen, R. (author), Van der Zant, H.S.J. (author)

We demonstrate a strong coupling between the flexural vibration modes of a clamped-clamped micromechanical resonator vibrating at low amplitudes. This coupling enables the direct measurement of the frequency response via amplitude- and phase modulation schemes using the fundamental mode as a mechanical detector. In the linear regime, a frequency...

journal article 2012

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Manipulation of organic polyradicals in a single-molecule transistor

Fock, J. (author), Leijnse, M. (author), Jennum, K. (author), Zyazin, A.S. (author), Paaske, J. (author), Hedegard, P. (author), Brondsted Nielsen, M. (author), Van der Zant, H.S.J. (author)

Inspired by cotunneling spectroscopy of spin-states in a single OPE5-based molecule, we investigate the prospects for electric control of magnetism in purely organic molecules contacted in a three-terminal geometry. Using the gate electrode, the molecule is reversibly switched between three different redox states, with magnetic spectra revealing...

journal article 2012

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Direct Observation of Magnetic Anisotropy in an Individual Fe4 Single-Molecule Magnet

Burzuri, E. (author), Zyazin, A.S. (author), Cornia, A. (author), Van der Zant, H.S.J. (author)

We study three-terminal charge transport through individual Fe4 single-molecule magnets. Magnetic anisotropy of the single molecule is directly observed by introducing a spectroscopic technique based on measuring the position of the degeneracy point as a function of gate voltage and applied magnetic field. A nonlinear field-dependence is...

journal article 2012

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Strong and tunable mode coupling in carbon nanotube resonators

Castellanos Gomez, A. (author), Meerwaldt, H.B. (author), Ventra, W.J. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)

The nonlinear interaction between two mechanical resonances of the same freely suspended carbon nanotube resonator is studied. We find that, in the Coulomb-blockade regime, the nonlinear modal interaction is dominated by single-electron-tunneling processes and that the mode-coupling parameter can be tuned with the gate voltage, allowing both...

journal article 2012

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Interactions between directly- and parametrically-driven vibration modes in a micromechanical resonator

Westra, H.J.R. (author), Karabacak, D.M. (author), Brongersma, S.H. (author), Crego-Calama, M. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)

The interactions between parametrically- and directly-driven vibration modes of a clamped-clamped beam resonator are studied. An integrated piezoelectric transducer is used for direct and parametric excitation. First, the parametric amplification and oscillation of a single mode are analyzed by the power and phase dependence below and above the...

journal article 2011

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Charge transport in a zinc-porphyrin single-molecule junction

Perrin, M.L. (author), Martin, C.A. (author), Prins, F. (author), Shaikh, A.J. (author), Eelkema, R. (author), Van Esch, J.H. (author), Van Ruitenbeek, J.M. (author), Van der Zant, H.S. (author), Dulic, D. (author)

We have investigated charge transport in ZnTPPdT-Pyr (TPPdT: 5,15-di(p-thiolphenyl)-10,20-di(p-tolyl)porphyrin) molecular junctions using the lithographic mechanically controllable break-junction (MCBJ) technique at room temperature and cryogenic temperature (6 K). We combined low-bias statistical measurements with spectroscopy of the molecular...

journal article 2011

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Q-factor control of a microcantilever by mechanical sideband excitation

Venstra, W.J. (author), Westra, H.J.R. (author), Van der Zant, H.S.J. (author)

We demonstrate the coupling between the fundamental and second flexural modes of a microcantilever. A mechanical analogue of cavity-optomechanics is then employed, where the mechanical cavity is formed by the second vibrational mode of the same cantilever, coupled to the fundamental mode via the geometric nonlinearity. By exciting the cantilever...

journal article 2011