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Sacépé, Benjamin (author), Feigel’man, Mikhail (author), Klapwijk, T.M. (author)In order to understand the emergence of superconductivity it is useful to study the reverse process and identify the various pathways that lead to its destruction. One way is to increase the amount of disorder, as this leads to an increase in Coulomb repulsion that overpowers the attractive interaction responsible for Cooper pair formation. A...review 2020
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Zhu, C. (author), Leung, Chloe Oi Ying (author), Lagoudaki, Eleni (author), Velho, Mariana (author), Segura Caballero, N. (author), Jolles, Dietsje (author), Duffy, Gavin (author), Maresch, Günter (author), Pagkratidou, Marianna (author), Klapwijk, R.M. (author)Empirical interdisciplinary research has explored the role of spatial ability in STEM learning and achievement. While most of this research indicates that fostering spatial thinking in educational contexts has the potential to positively impact students’ enrollment and performance in STEM subjects, there is less agreement on the best approach...review 2023
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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
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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
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- Gielen, M.A. (author), Klapwijk, R.M. (author), Schut, A. (author), van Mechelen, M.P.P. (author) report 2020
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- Klapwijk, T.M. (author) public lecture 2001
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Klapwijk, T.M. (author)The invention provides aterahertz scanning probe microscope setup comprising (i) a terahertz radiation source configured to generate terahertz radiation; (ii) a terahertz lens configured to receive at least part of the terahertz radiation from the terahertz radiation source; (iii) a cantilever unit comprising a cantilever with at its distal end...patent 2014
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- Craciun, M.F. (author), Rogge, S. (author), Klapwijk, T.M. (author), Morpurgo, A. (author) patent 2005
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De Visser, P.J. (author), Yates, S.J.C. (author), Guruswamy, T. (author), Goldie, D.J. (author), Withington, S. (author), Neto, A. (author), Llombart, N. (author), Baryshev, A.M. (author), Klapwijk, T.M. (author), Baselmans, J.J.A. (author)We have measured the absorption of terahertz radiation in a BCS superconductor over a broad range of frequencies from 200 GHz to 1.1 THz, using a broadband antenna-lens system and a tantalum microwave resonator. From low frequencies, the response of the resonator rises rapidly to a maximum at the gap edge of the superconductor. From there on,...journal article 2015
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Wiedenmann, J. (author), Bocquillon, E. (author), Deacon, R.S. (author), Hartinger, S. (author), Hermann, O. (author), Klapwijk, T.M. (author), Maier, L. (author), Ames, C. (author), Brüne, C. (author), Gould, C. (author), Oiwa, A. (author), Ishibashi, K. (author), Tarucha, S. (author), Buhmann, H. (author), Molenkamp, L.W. (author)The Josephson effect describes the generic appearance of a supercurrent in a weak link between two superconductors. Its exact physical nature deeply influences the properties of the supercurrent. In recent years, considerable efforts have focused on the coupling of superconductors to the surface states of a three-dimensional topological...journal article 2016
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Ren, Y. (author), Hovenier, J.N. (author), Cui, M. (author), Hayton, D.J. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Shi, S.C. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author)We report frequency locking of two 3.5-THz third-order distributed feedback (DFB) quantum cascade lasers (QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. We show that the free-running linewidths of the QCLs are dependent on the electrical and temperature tuning coefficients....journal article 2012
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Vercruyssen, N. (author), Verhagen, T.G.A. (author), Flokstra, M.G. (author), Pekola, J.P. (author), Klapwijk, T.M. (author)We study the nonlinear response of current transport in a superconducting diffusive nanowire between normal reservoirs. We demonstrate theoretically and experimentally the existence of two different superconducting states appearing when the wire is driven out of equilibrium by an applied bias, called the global and bimodal superconducting states...journal article 2012
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Janssen, R.M.J. (author), Endo, A. (author), Baselmans, J.J.A. (author), De Visser, P.J. (author), Barends, R. (author), Klapwijk, T.M. (author)The sensitivity of microwave kinetic inductance detectors (MKIDs) based on coplanar waveguides (CPWs) needs to be improved by at least an order of magnitude to satisfy the requirements for space-based terahertz astronomy. Our aim is to investigate if this can be achieved by reducing the width of the CPW to much below what has typically been made...journal article 2012
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- Smit, G.D.J. (author), Rogge, S. (author), Caro, J. (author), Klapwijk, T.M. (author) journal article 2003
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Ren, Y. (author), Hovenier, J.N. (author), Higgins, R. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Shi, S.C. (author), Bell, A. (author), Klein, B. (author), Williams, B.S. (author), Kumar, S. (author), Hu, Q. (author), Reno, J.L. (author)A terahertz (THz) heterodyne spectrometer is demonstrated based on a quantum cascade laser (QCL) as a local oscillator (LO) and an NbN hot electron bolometer as a mixer, and it is used to measure high-resolution molecular spectral lines of methanol (CH3OH) between 2.913–2.918 THz. The spectral lines are taken from a gas cell containing methanol...journal article 2010
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Ren, Y. (author), Hovenier, J.N. (author), Higgins, R. (author), Gao, J.R. (author), Klapwijk, T.M. (author), Shi, S.C. (author), Klein, B. (author), Kao, T.Y. (author), Hu, Q. (author), Reno, J.L. (author)A frequency tunable terahertz heterodyne spectrometer, based on a third-order distributed feedback quantum cascade laser as a local oscillator, has been demonstrated by measuring molecular spectral lines of methanol (CH3OH) gas at 3.5 THz. By varying the bias voltage of the laser, we achieved a tuning range of ? 1?GHz of the lasing frequency,...journal article 2011
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- Mena, F.P. (author), Kooi, J.W. (author), Baryshev, A.M. (author), Lodewijk, C.F.J. (author), Hesper, R. (author), Wild, W. (author), Klapwijk, T.M. (author) journal article 2008
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Janssen, R.M.J. (author), Baselmans, J.J.A. (author), Endo, A. (author), Ferrari, L. (author), Yates, S.J.C. (author), Baryshev, A.M. (author), Klapwijk, T.M. (author)We demonstrate photon noise limited performance in both phase and amplitude readout in microwave kinetic inductance detectors (MKIDs) consisting of NbTiN and Al, down to 100 fW of optical power. We simulate the far field beam pattern of the lens-antenna system used to couple radiation into the MKID and derive an aperture efficiency of 75%. This...journal article 2013
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- van Gorkom, R.P. (author), Caro, J. (author), Klapwijk, T.M. (author), Radelaar, S. (author) journal article 2001
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- Keizer, R.S. (author), Flokstra, M.G. (author), Aarts, J. (author), Klapwijk, T.M. (author) journal article 2006