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Papadopoulos, N. (author), Gehring, P. (author), Watanabe, Kenji (author), Taniguchi, Takashi (author), van der Zant, H.S.J. (author), Steele, G.A. (author)In transition metal dichalcogenides, defects have been found to play an important role, affecting doping, spin-valley relaxation dynamics, and assisting in proximity effects of spin-orbit coupling. Here we study localized states in WS2 and how they affect tunneling through van der Waals heterostructures of h-BN/graphene/ WS2/metal. The...journal article 2020
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Siskins, M. (author), Lee, M. (author), Mañas-Valero, Samuel (author), Coronado, Eugenio (author), Blanter, Y.M. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author)The reduced dimensionality of two-dimensional (2D) materials results in characteristic types of magnetically and electronically ordered phases. However, only few methods are available to study this order, in particular in ultrathin insulating antiferromagnets that couple weakly to magnetic and electronic probes. Here, we demonstrate that...journal article 2020
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Siskins, M. (author), Lee, M. (author), Wehenkel, D. (author), van Rijn, R. (author), de Jong, Tijmen W. (author), Renshof, Johannes R. (author), Hopman, Berend C. (author), Peters, Willemijn S.J.M. (author), Davidovikj, D. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author)The high flexibility, impermeability and strength of graphene membranes are key properties that can enable the next generation of nanomechanical sensors. However, for capacitive pressure sensors, the sensitivity offered by a single suspended graphene membrane is too small to compete with commercial sensors. Here, we realize highly sensitive...journal article 2020
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Zwick, Patrick (author), Hsu, C. (author), El Abbassi, M. (author), Fuhr, Olaf (author), Fenske, Dieter (author), Dulic, D. (author), van der Zant, H.S.J. (author), Mayor, Marcel (author)Porphyrin cyclophane 1, consisting of two rigidly fixed but still movable cofacial porphyrins and exposing acetate-masked thiols in opposed directions of the macrocycle, is designed, synthesized, and characterized. The functional cyclophane 1, as pioneer of mechanosensitive 3D materials, forms stable single-molecule junctions in a...journal article 2020
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Caneva, S. (author), Hermans, Matthijs (author), Lee, M. (author), García-Fuente, Amador (author), Watanabe, Kenji (author), Taniguchi, Takashi (author), Dekker, C. (author), Ferrer, Jaime (author), van der Zant, H.S.J. (author), Gehring, P. (author)Graphene quantum dots (QDs) are intensively studied as platforms for the next generation of quantum electronic devices. Fine tuning of the transport properties in monolayer graphene QDs, in particular with respect to the independent modulation of the tunnel barrier transparencies, remains challenging and is typically addressed using...journal article 2020
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Groenendijk, D.J. (author), Manca, N. (author), de Bruijckere, J. (author), Monteiro, Ana Mafalda R.V.L. (author), Gaudenzi, R. (author), van der Zant, H.S.J. (author), Caviglia, A. (author)SrIrO <sub>3</sub>, the three-dimensional member of the Ruddlesden–Popper iridates, is a paramagnetic semimetal characterised by a the delicate interplay between spin–orbit coupling and Coulomb repulsion. In this work, we study the anisotropic magnetoresistance (AMR) of SrIrO <sub>3</sub> thin films, which is closely linked to spin–orbit...journal article 2020
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Davidovikj, D. (author), Groenendijk, D.J. (author), Monteiro, A. M.R.V.L. (author), Dijkhoff, A. (author), Afanasiev, D. (author), Siskins, M. (author), van der Zant, H.S.J. (author), Caviglia, A. (author), Steeneken, P.G. (author)Complex oxide thin films and heterostructures exhibit a variety of electronic phases, often controlled by the mechanical coupling between film and substrate. Recently it has become possible to isolate epitaxially grown single-crystalline layers of these materials, enabling the study of their properties in the absence of interface effects. In...journal article 2020
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Mazaheri, Ali (author), Lee, M. (author), van der Zant, H.S.J. (author), Frisenda, Riccardo (author), Castellanos Gomez, A. (author)We fabricate paper-supported semiconducting devices by rubbing a layered molybdenum disulfide (MoS2) crystal onto a piece of paper, similar to the action of drawing/writing with a pencil on paper. We show that the abrasion between the MoS2 crystal and the paper substrate efficiently exfoliates the crystals, breaking the weak van der Waals...journal article 2020
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Mishra, K. K. (author), Ravindran, T. R. (author), Island, J.O. (author), Flores, Eduardo (author), Ares, Jose Ramon (author), Sanchez, Carlos (author), Ferrer, Isabel J. (author), van der Zant, H.S.J. (author), Castellanos-Gomez, Andres (author)Two-dimensional layered trichalcogenide materials have recently attracted the attention of the scientific community because of their robust mechanical and thermal properties and applications in opto- and nanoelectronics devices. We report the pressure dependence of out-of-plane Ag Raman modes in high quality few-layer titanium trisulfide ...journal article 2020
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Dulic, D. (author), Rates Soriano, A. (author), Castro, Edison (author), Labra Muñoz, J. (author), Aravena, Daniel (author), Etcheverry-Berrios, Alvaro (author), Riba-López, Daniel (author), Aliaga-Alcalde, Núria (author), van der Zant, H.S.J. (author)We present experimental and theoretical studies of single-molecule conductance through nonplanar fullerocurcuminoid molecular dyads in ambient conditions using the mechanically controllable break junction technique. We show that molecular dyads with bare fullerenes form configurations with conductance features related to different transport...journal article 2019
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Zotti, Linda A. (author), Bednarz, Beatrice (author), Hurtado-Gallego, Juan (author), Cabosart, D.C.N. (author), Rubio-Bollinger, Gabino (author), Agrait, Nicolas (author), van der Zant, H.S.J. (author)We studied the electron-transport properties of ten different amino acids and one dimer (di-methionine) using the mechanically controlled break-junction (MCBJ) technique. For methionine and cysteine, additional measurements were performed with the scanning tunneling microscope break-junction (STM-BJ) technique. By means of a statistical...journal article 2019
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Zalom, Peter (author), de Bruijckere, J. (author), Gaudenzi, Rocco (author), van der Zant, H.S.J. (author), Novotný, Tomáš (author), Korytár, Richard (author)We investigate theoretically and experimentally the singlet-triplet Kondo effect induced by a magnetic field in a molecular junction. Temperature-dependent conductance, G(T), is calculated by the numerical renormalization group, showing a strong imprint of the relevant low-energy scales, such as the Kondo temperature, exchange, and singlet...journal article 2019
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Hsu, C. (author), Frisenda, Riccardo (author), Schmidt, Robert (author), Arora, Ashish (author), de Vasconcellos, Steffen Michaelis (author), Bratschitsch, Rudolf (author), van der Zant, H.S.J. (author), Castellanos-Gomez, Andres (author)An interesting aspect of 2D materials is the change of their electronic structure with the reduction of thickness. Molybdenum and tungsten-based transition metal dichalcogenides form an important family of 2D materials, whose members show a thickness-dependent bandgap and strong light–matter interaction. In this work, the experimental...journal article 2019
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Cabosart, D.C.N. (author), El Abbassi, M. (author), Stefani, D. (author), Frisenda, Riccardo (author), Calame, Michel (author), van der Zant, H.S.J. (author), Perrin, M.L. (author)Single-molecule break-junction measurements are intrinsically stochastic in nature, requiring the acquisition of large datasets of “breaking traces” to gain insight into the generic electronic properties of the molecule under study. For example, the most probable conductance value of the molecule is often extracted from the conductance...journal article 2019
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Papadopoulos, N. (author), Watanabe, Kenji (author), Taniguchi, Takashi (author), van der Zant, H.S.J. (author), Steele, G.A. (author)We present measurements of weak localization on hexagonal boron nitride encapsulated bilayer MoS2. From the analysis we obtain information regarding the phase coherence and the spin diffusion of the electrons. We find that the encapsulation with boron nitride provides higher mobilities in the samples, and the phase coherence shows improvement...journal article 2019
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Dugay, J. (author), Giménez-Marqués, Mónica (author), Venstra, W.J. (author), Torres-Cavanillas, Ramón (author), Sheombarsing, U.N. (author), Manca, N. (author), Coronado, Eugenio (author), van der Zant, H.S.J. (author)In the past years, the use of highly sensitive silicon microelectromechanical cantilevers has been proposed as a tool to characterize the spin-crossover phenomenon by employing fast optical readout of the motion. In this work, Fe <sup>II</sup> -based spin-crossover nanoparticles of the well-known [Fe(Htrz) <sub>2</sub> (trz)](BF <sub>4</sub>...journal article 2019
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de Bruijckere, J. (author), Gehring, P. (author), Palacios-Corella, M. (author), Coronado, E. (author), Paaske, J. (author), Hedegård, P. (author), van der Zant, H.S.J. (author)It is known that the quantum mechanical ground state of a nanoscale junction has a significant impact on its electrical transport properties. This becomes particularly important in transistors consisting of a single molecule. Because of strong electron-electron interactions and the possibility of accessing ground states with high spins, these...journal article 2019
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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<sup>II</sup>bis-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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Lehner, B. (author), Janssen, V.A.E.C. (author), Spiesz, E.M. (author), Benz, D. (author), Brouns, S.J.J. (author), Meyer, Anne S. (author), van der Zant, H.S.J. (author)Graphene's maximized surface-to-volume ratio, high conductance, mechanical strength, and flexibility make it a promising nanomaterial. However, large-scale graphene production is typically cost-intensive. This manuscript describes a microbial reduction approach for producing graphene that utilizes the bacterium Shewanella oneidensis in...journal article 2019
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Dolleman, R.J. (author), Hsu, Z. (author), Vollebregt, S. (author), Sader, John E. (author), van der Zant, H.S.J. (author), Steeneken, P.G. (author), Ghatkesar, M.K. (author)Current wafer-scale fabrication methods for graphene-based electronics and sensors involve the transfer of single-layer graphene by a support polymer. This often leaves some polymer residue on the graphene, which can strongly impact its electronic, thermal, and mechanical resonance properties. To assess the cleanliness of graphene fabrication...journal article 2019