- document
-
Vodolazov, D. Yu (author), Klapwijk, T.M. (author)We study, theoretically, the single-photon response of a strongly disordered thin superconducting strip in the flux flow state. We find that this resistive state, at a current I larger than the critical current Ic, jumps to the normal state by the absorption of a single optical photon. The absorbed photon creates a beltlike region with...journal article 2019
- document
-
Thierschmann, R. (author), Mulazimoglu, E. (author), Manca, N. (author), Goswami, S. (author), Klapwijk, T.M. (author), Caviglia, A. (author)One of the hallmark experiments of quantum transport is the observation of the quantized resistance in a point contact in GaAs/AlGaAs heterostructures. Being formed with split gate technology, these structures represent in an ideal manner equilibrium reservoirs which are connected only through a few electron mode channel. It has been a long...journal article 2018
- document
-
Roël-Looijenga, A. (author), Klapwijk, R.M. (author), de Vries, M.J. (author)In this paper, pupils’ design behaviour is regarded as an expression of active knowledge acquisition. Four cases of building a task structure, which supports effective discovery learning, were investigated. We focus on simple characteristics in a model to explain the effects of the structure on task execution. It reconciles<br/>the advantages of...conference paper 2018
- document
-
Effects of Convergent and Divergent Feedback on Creative Thinking During Children’s Design ProcessesSchut, A. (author), Klapwijk, R.M. (author), Gielen, M.A. (author)This paper explores patterns in the feedback preceding instances of design fixation in children (age 9 to 11) carrying out a co-design project. Our goal is to find ways to improve the early mastering of their divergent (DT) and convergent thinking (CT) skills, which in turn will help the children to develop their creative abilities. Previous...conference paper 2018
- document
-
Hill, Adrian Vickery (author), Warden, Josie (author), Hausleitner, B. (author), Muñoz Sanz, V. (author), Meyer, Han (author), Croxford, Ben (author), Domenech, Teresa (author), Dellot, Ben (author), Wallace-Stephens, Fabian (author), Vanin, Fabio (author), Orban, Alexandre (author), Gobatto, Federico (author), Macron, Alessandra (author), Klapwijk, A. (author), Nakhlé, Lise (author), Rebreanu, Laura (author)Cities of making assesses the role and current state of manufacturing in three of Europe’s urban centres. Compiled by a consortium of partners in London, Brussels and Rotterdam it forms part of Cities of Making, a thirty-month programme exploring the future of urban based manufacturing in European cities. This report brings together insights...report 2018
- document
-
Hausleitner, B. (author), Muñoz Sanz, V. (author), Meyer, Han (author), Klapwijk, Anouk (author)The Cities of Making 'Cities Report', offers an insight into urban manufacturing in three global cities - Brussels, London and Rotterdam. Each city has had a distinctive industrial heritage and is interpreting the future of manufacturing in very different ways. This report exposes unique qualities of each and common trends that may be relevant...book chapter 2018
- document
- Klapwijk, R.M. (author), Gielen, M.A. (author), Schut, A. (author), van Mechelen, M.P.P. (author) book 2018
- document
-
Tikhonov, K. S. (author), Skvortsov, M. A. (author), Klapwijk, T.M. (author)We address the problem of nonequilibrium superconductivity in the presence of microwave irradiation. Using contemporary analytical methods, we refine the old Eliashberg theory and generalize it to arbitrary temperatures T and frequencies ω. Microwave radiation is shown to stimulate superconductivity in a bounded region in the (ω,T) plane. In...journal article 2018
- document
-
Peltonen, J. T. (author), Coumou, P.C.J.J. (author), Peng, Z. (author), Klapwijk, T.M. (author), Tsai, J. S. (author), Astafiev, O. V. (author)We report development and microwave characterization of rf SQUID (Superconducting QUantum Interference Device) qubits, consisting of an aluminium-based Josephson junction embedded in a superconducting loop patterned from a thin film of TiN with high kinetic inductance. Here we demonstrate that the systems can offer small physical size, high...journal article 2018
- document
-
Baeva, E. M. (author), Sidorova, M. V. (author), Korneev, A. A. (author), Smirnov, K. V. (author), Divochy, A. V. (author), Morozov, P. V. (author), Zolotov, P. I. (author), Vakhtomin, Yu B. (author), Klapwijk, T.M. (author)We investigate thermal properties of a NbN single-photon detector capable of unit internal detection efficiency. Using an independent calibration of the coupling losses, we determine the absolute optical power absorbed by the NbN film and, via resistive superconductor thermometry, the temperature dependence of the thermal resistance Z(T) of...journal article 2018
- document
-
Korneeva, Yuliya (author), Vodolazov, Denis (author), Florya, Irina (author), Manova, Nadegda (author), Smirnov, Eugenii (author), Korneev, Alexander (author), Mikhailov, Michail (author), Goltsman, Gregory (author), Klapwijk, T.M. (author)We experimentally demonstrate the single photon detection in straight micrometer-wide NbN and α-MoSi bridges. Width of the bridges is 2 μm, while the wavelength of the photon changes from 408 to 1550 nm and critical current exceeds 50% of the depairing current. Obtained results offer the alternative route for design of detectors without...journal article 2018
- document
-
Westig, M.P. (author), Klapwijk, T.M. (author)A directional superconducting parametric amplifier in the GHz frequency range is designed and analyzed, suitable for low-power read-out of microwave kinetic inductance detectors employed in astrophysics and when combined with a nonreciprocal device at its input also for circuit quantum electrodynamics. It consists of a one-wavelength-long...journal article 2018
- document
-
Klapwijk, T.M. (author), Semenov, A. V. (author)Superconducting hot-electron bolometers are presently the best performing mixing devices for the frequency range beyond 1.2 THz, where good-quality superconductor-insulator-superconductor devices do not exist. Their physical appearance is very simple: an antenna consisting of a normal metal, sometimes a normal-metal-superconductor bilayer,...journal article 2017
- document
-
Bercioux, D (author), Klapwijk, T.M. (author), Bergeret, F. S. (author)We investigate the transport properties of a junction consisting of an electron-hole bilayer in contact with normal and superconducting leads. The electron-hole bilayer is considered as a semimetal with two electronic bands. We assume that in the region between the contacts the system hosts an exciton condensate described by a BCS-like model...journal article 2017
- document
-
Titova, Nadezhda (author), Kardakova, Anna I. (author), Tovpeko, Nina (author), Ryabchun, Sergey (author), Mandal, Soumen (author), Morozov, Dmitry (author), Klemencic, Georgina M. (author), Giblin, Sean R. (author), Williams, Oliver A. (author), Goltsman, Gregory N. (author), Klapwijk, T.M. (author)We have measured the electron-phonon energy-relaxation time, τ<sub>eph</sub>, in superconducting boron-doped diamond films grown on silicon substrate by chemical vapor deposition. The observed electron-phonon cooling times vary from 160 ns at 2.70 K to 410 ns at 1.8 K following a T<sup>-2</sup>-dependence. The data are consistent with the...journal article 2017
- document
-
Bos, Boy Gustaaf Cornelis (author), Thoen, David (author), Haalebos, E. A.F. (author), Gimbel, P. M.L. (author), Klapwijk, T.M. (author), Baselmans, J.J.A. (author), Endo, A. (author)The superconducting critical temperature (T-\mathrm{c} > 15 K) of niobium titanium nitride (NbTiN) thin films allows for low-loss circuits up to 1.1 THz, enabling on-chip spectroscopy and multipixel imaging with advanced detectors. The drive for large-scale detector microchips is demanding NbTiN films with uniform properties over an...journal article 2017
- document
-
Domínguez, F. (author), Kashuba, O (author), Bocquillon, E (author), Wiedenmann, J (author), Deacon, R. S. (author), Klapwijk, T.M. (author), Platero, G (author), Molenkamp, Laurens W. (author), Trauzettel, B. (author), Hankiewicz, E. M. (author)We investigate theoretically the dynamics of a Josephson junction in the framework of the resistively shunted junction model. We consider a junction that hosts two supercurrent contributions: a 2π and a 4π periodic in phase, with intensities I2π and I4π, respectively. We study the size of the Shapiro steps as a function of the ratio of the...journal article 2017
- document
-
Deacon, R. S. (author), Wiedenmann, J (author), Bocquillon, E (author), Domínguez, F. (author), Klapwijk, T.M. (author), Leubner, P. (author), Brüne, C (author), Hankiewicz, E. M. (author), Tarucha, S (author), Ishibashi, K (author), Buhmann, H (author), Molenkamp, Laurens W. (author)Frequency analysis of the rf emission of oscillating Josephson supercurrent is a powerful passive way of probing properties of topological Josephson junctions. In particular, measurements of the Josephson emission enable the detection of topological gapless Andreev bound states that give rise to emission at half the Josephson frequency f<sub...review 2017
- document
-
Island, J.O. (author), Gaudenzi, R. (author), de Bruijckere, J. (author), Burzuri Linares, E. (author), Franco, Carlos (author), Mas-Torrent, Marta (author), Rovira, Concepció (author), Veciana, Jaume (author), Klapwijk, T.M. (author), Aguado, Ramón (author), van der Zant, H.S.J. (author)Superconductors containing magnetic impurities exhibit intriguing phenomena derived from the competition between Cooper pairing and Kondo screening. At the heart of this competition are the Yu-Shiba-Rusinov (Shiba) states which arise from the pair breaking effects a magnetic impurity has on a superconducting host. Hybrid superconductor...journal article 2017
- document
-
Roël-Looijenga, A. (author), Klapwijk, R.M. (author), de Vries, M.J. (author)One of the core activities of Design and Technology Education is designing, which is a thinking activity that benefits greatly from expression. Verbal expression serves interaction. A teacher can induce verbal expression in pupils by inviting them to interact about familiar subjects. This interaction is a stepping stone towards an integration of...journal article 2017