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Complexity of Electron Transport in Nanoscale Molecular Junctions

Ornago, L. (author)

In this dissertation, we analyse the charge transport of nanoscale molecular junctions in mechanically controllable break junction (MCBJ) experiments. In particular, we focus on the characterization of molecular features going beyond the "single-peak" picture, that is, considering features in the measurements in addition to themost prominent one...

doctoral thesis 2023

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Conformational and Spin Effects in Single-Molecule Electronic Transport

Hsu, C. (author)

This dissertation presents the experimental work on singlemolecule charge transport, particularly on the aspects of spin and orbital conformational effects in singlemolecule junctions. In this dissertation, we employ and develop various singlemolecule techniques, the mechanically controlled break junction (MCBJ), thermoelectric electromigrated...

doctoral thesis 2022

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Magnetic Fingerprints in an All-Organic Radical Molecular Break Junction

Baum, T.Y. (author), Fernández, Saleta (author), Peña, Diego (author), van der Zant, H.S.J. (author)

Polycyclic aromatic hydrocarbons radicals are organic molecules with a nonzero total magnetic moment. Here, we report on charge-transport experiments with bianthracene-based radicals using a mechanically controlled break junction technique at low temperatures (6 K). The conductance spectra demonstrate that the magnetism of the diradical is...

journal article 2022

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Controlling the Entropy of a Single-Molecule Junction

Pyurbeeva, Eugenia (author), Hsu, C. (author), Vogel, David (author), Wegeberg, Christina (author), Mayor, Marcel (author), van der Zant, H.S.J. (author), Mol, Jan A. (author), Gehring, P. (author)

Single molecules are nanoscale thermodynamic systems with few degrees of freedom. Thus, the knowledge of their entropy can reveal the presence of microscopic electron transfer dynamics that are difficult to observe otherwise. Here, we apply thermocurrent spectroscopy to directly measure the entropy of a single free radical molecule in a...

journal article 2021

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Enhanced Separation Concept (ESC): Removing the Functional Subunit from the Electrode by Molecular Design

Brandl, Thomas (author), El Abbassi, M. (author), Stefani, D. (author), Frisenda, R. (author), Harzmann, Gero D. (author), van der Zant, H.S.J. (author), Mayor, Marcel (author)

A new concept to improve the reliability of functional single molecule junctions is presented using the E-field triggered switching of Fe^IIbis-terpyridine complexes in a mechanically controlled break junction experiment as model system. The complexes comprise a push-pull ligand sensing the applied E-field and the resulting...

journal article 2019

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Large Conductance Variations in a Mechanosensitive Single-Molecule Junction

Stefani, D. (author), Weiland, Kevin J. (author), Skripnik, Maxim (author), Hsu, C. (author), Perrin, M.L. (author), Mayor, Marcel (author), Pauly, Fabian (author), van der Zant, H.S.J. (author)

An appealing feature of molecular electronics is the possibility of inducing changes in the orbital structure through external stimuli. This can provide functionality on the single-molecule level that can be employed for sensing or switching purposes if the associated conductance changes are sizable upon application of the stimuli. Here, we...

journal article 2018

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Modeling level alignment at interfaces in molecular junctions

Celis Gil, J.A. (author)

Molecular devices are planned as alternative solutions for heat dissipation problems and reliable fabrication of nano-scale devices. However, it also opens up possibilities of combining many other degrees of freedom into functional device design. While they introduce interesting opportunities for study, they also demand a versatile, scalable...

doctoral thesis 2017

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Quantum Transport Phenomena in Magnetic Molecules

Gaudenzi, R. (author)

In this work, we investigate a series of physical phenomena resulting from the confinement of electrons in those localised charge and spin quantum boxes generically called molecules.

doctoral thesis 2017

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Molecular Electronics: When Multiple Orbitals Matter

Koole, M. (author)

doctoral thesis 2017

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Redox-Induced Gating of the Exchange Interactions in a Single Organic Diradical

Gaudenzi, R. (author), de Bruijckere, J. (author), Reta, Daniel (author), de P.R. Moreira, Iberio (author), Rovira, Concepcio (author), Veciana, Jaume (author), van der Zant, H.S.J. (author), Burzuri Linares, E. (author)

Embedding a magnetic electroactive molecule in a three-terminal junction allows for the fast and local electric field control of magnetic properties desirable in spintronic devices and quantum gates. Here, we provide an example of this control through the reversible and stable charging of a single all-organic neutral diradical molecule. By means...

journal article 2017

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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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Modeling Molecular Junctions: Weak and Strong Coupling Regimes

Mirjani, F. (author)

Electron transport through single molecule connected to the electrodes is an interesting problem from a fundamental point of view, and because of possible applications. From the theoretical point of view, the hope is that understanding the transport phenomena in such systems enables us to explain measurements and develop devices with new...

doctoral thesis 2012

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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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Molecular functionality in nanoelectronic devices

Prins, F. (author)

doctoral thesis 2011

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A versatile low-temperature setup for the electrical characterization of single-molecule junctions

Martin, C.A. (author), Smit, R.H.M. (author), Van Egmond, R. (author), Van der Zant, H.S.J. (author), Van Ruitenbeek, J.M. (author)

We present a modular high-vacuum setup for the electrical characterization of single molecules down to liquid helium temperatures. The experimental design is based on microfabricated mechanically controllable break junctions, which offer control over the distance of two electrodes via the bending of a flexible substrate. The actuator part of the...

journal article 2011

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Charge transport through single molecules in two- and three-terminal mechanical break junctions

Martin, C.A. (author)

During the past decades the downscaling of integrated circuits has been governed by Moore's law, which predicts device dimensions on the order of 10 nm in 2020. Fundamental research in molecular electronics explores the possibility of fabricating such nanoscale devices from single molecules, which offer the prospects of chemical tunability and...

doctoral thesis 2010

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Self-consistent theory of molecular switching

Pistolesi, F. (author), Blanter, Ya.M. (author), Martin, I. (author)

We study the model of a molecular switch comprised of a molecule with a soft vibrational degree of freedom coupled to metallic leads. In the presence of strong electron-ion interaction, different charge states of the molecule correspond to substantially different ionic configurations, which can lead to very slow switching between energetically...

journal article 2008

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High intra-chain hole mobility on molecular wires of ladder type poly(p-phenylenes)

Prins, P. (author), Grozema, F.C. (author), Schins, J.M. (author), Patil, S. (author), Scherf, U. (author), Siebbeles, L.D.A. (author)

The high frequency mobility of charge carriers on isolated ladder-type polymer chains with lengths ranging from 13 to 54 monomer units was measured. Experiments were performed on isolated chains in dilute solution and on bulk solid samples. The ac mobility of charge carriers measured at a microwave frequency near 30 GHz is strongly dependent on...

conference paper 2006

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Electrical transport measurements on self-assembled organic molecular wires

Durkut, M. (author), Mas-Torrent, M. (author), Hadley, P. (author), Jonkheijm, P. (author), Schenning, A.P.H.J. (author), Meijer, E.W. (author), George, S. (author), Ajayaghosh, A. (author)

The electrical properties of supermolecular assemblies of oligo(p-phenylene vinylene) were studied. These materials self-assemble into well-defined cylindrical structures in solution with lengths in the range of 100?nm–10??m and diameters between 5 and 200?nm. Atomic force microscopy showed that by adjusting the concentration, either individual...

journal article 2006

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Noise and Spin in Nanostructures

Jouravlev, O.N. (author)

doctoral thesis 2005