Searched for: subject:"superconductors"
(1 - 20 of 48)

Pages

document
de Rooij, Steven (author)
Microwave Kinetic Inductance Detectors (MKIDs) are remarkable photon detectors, that have single photon detection and energy resolving capabilities in the near-infra red and higher frequency range. At lower frequencies, MKIDs are excellent radiation detectors as well, because of their high sensitivity and natural multiplexing capabilities, which...
master thesis 2020
document
Ridderbos, Joost (author), Braun, M. (author), de Vries, F.K. (author), Shen, J. (author), Li, Ang (author), Kölling, S. (author), Verheijen, Marcel A. (author), Brinkman, Alexander (author), van der Wiel, Wilfred G. (author), Bakkers, E.P.A.M. (author), Zwanenburg, Floris A. (author)
We show a hard superconducting gap in a Ge-Si nanowire Josephson transistor up to in-plane magnetic fields of 250 mT, an important step toward creating and detecting Majorana zero modes in this system. A hard gap requires a highly homogeneous tunneling heterointerface between the superconducting contacts and the semiconducting nanowire. This...
journal article 2020
document
Flór, Matthias (author)
The edge states in finite quantum Hall graphene have previously been shown to be valley polarised for zigzag and armchair edges. Assuming that the valley isospin is also conserved at a smooth normal-superconducting (NS) interface, theoretical research has previously predicted that plateaus in the longitudinal conductance are expected to occur in...
bachelor thesis 2019
document
de Moor, M.W.A. (author)
Quantum technology is a promising area of research, with the quantum computer as the prime example. Quantum computers can perform calculations thought to be impossible by conventional means. The fundamental building block of a quantum computer is a qubit, which is a quantumsystem which can be used to process and store quantuminformation. Most...
doctoral thesis 2019
document
Proutski, A. (author)
Materials possessing superconducting properties are highly sought after due to their potential technological applications. Much of the work has focused on utilising a thin insulating barrier separating a pair of superconducting electrodes, a Josephson junction, as a workhorse in the field of superconducting based quantumcomputation. Yet such...
doctoral thesis 2019
document
Sahu, Sudhir Kumar (author), Vaidya, Jaykumar (author), Schmidt, F.E. (author), Jangade, Digambar (author), Thamizhavel, Arumugam (author), Steele, G.A. (author), Deshmukh, Mandar M. (author), Singh, V. (author)
In this report, we present nanoelectromechanical resonators fabricated with thin exfoliated crystals of a high-T <sub>c</sub> cuprate superconductor Bi <sub>2</sub> Sr <sub>2</sub> Ca <sub>1</sub> Cu <sub>2</sub> O. The mechanical readout is performed by capacitively coupling their motion to a coplanar waveguide microwave cavity fabricated...
journal article 2019
document
Liu, D. (author), Polinder, H. (author), Abrahamsen, Asger B. (author), Ferreira, J.A. (author)
This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies....
journal article 2017
document
Talantsev, E. F. (author), Crump, W. P. (author), Island, J.O. (author), Xing, Ying (author), Sun, Yi (author), Wang, Jian (author), Tallon, J. L. (author)
Recent experiments showed that thinning gallium, iron selenide and 2H tantalum disulfide to single/several monoatomic layer(s) enhances their superconducting critical temperatures. Here, we characterize these superconductors by extracting the absolute values of the London penetration depth, the superconducting energy gap, and the relative...
journal article 2017
document
Broekens, K.A. (author)
Future high-energy physics demands higher magnetic fields to attain higher beam energies and thus needs novel superconductingmaterials in accelerator magnet applications. Current superconductors operate in the temperature range between 1.8 and 4.2 K and attain 8 T in modern operational machines. Meanwhile, prototypes have been built to operate...
master thesis 2016
document
Shcherbatenko, M. (author), Tretyakov, I. (author), Lobanov, Yu (author), Maslennikov, S. N. (author), Kaurova, N. (author), Finkel, M. (author), Voronov, B. (author), Goltsman, G. (author), Klapwijk, T.M. (author)
We present a physically consistent interpretation of the dc electrical properties of niobiumnitride (NbN)-based superconducting hot-electron bolometer mixers, using concepts of nonequilibrium superconductivity. Through this, we clarify what physical information can be extracted from the resistive transition and the dc current-voltage...
journal article 2016
document
Vuik, A. (author), Eeltink, D. (author), Akhmerov, A.R. (author), Wimmer, M.T. (author)
One of the promising platforms for creating Majorana bound states is a hybrid nanostructure consisting of a semiconducting nanowire covered by a superconductor.Weanalyze the previously disregarded role of electrostatic interaction in these devices. Our main result is that Coulomb interaction causes the chemical potential to respond to an applied...
journal article 2016
document
Zuo, K. (author), Mourik, V. (author)
Majorana fermions are exotic elementary particles predicted in 1937 by Ettore Majorana. Although heavily searched for, they have never been found in nature up to date. In the past decades, with the progress in theory, theoretical physicists predicted that Majorana fermions might emerge in certain exotic classes of condensed matter systems, where...
doctoral thesis 2016
document
Hossain, M.R. (author)
The number of installed wind turbines is growing every year as the need for energy increases in an exponential manner. As the wind turbines are trying to fulfill these requirements, the demand for output power from each individual turbine is increasing as well. Although this is great, implementation of new technologies such as direct drive...
master thesis 2014
document
Godschalk, F. (author)
In this dissertation, we study a novel class of laser devices, referred to as half-Josephson lasers (HJL). Here, lasing at half the Josephson frequency is induced by a parametric instability, resulting from an oscillating supercurrent flowing through a Josephson junction that contains quantum emitters. The device combines the electronic...
doctoral thesis 2014
document
Van der Blij, N.H. (author)
In this thesis the feasibility of using superconductors to generate a magnetic field in an actuator is studied. The first objective of the thesis is to determine the achievable magnetic fields with commercially available superconductors. Second a superconducting actuator and its cryostat are designed. Finally the superconducting actuator is...
master thesis 2013
document
Van Woerkom, D.J. (author)
In this Master thesis I report results on a route to find Majorana fermions in indium antimonide nanowires in contact with a superconductor. Theoretically Majorana fermions appear in one-dimensional nanowires with strong spin-orbit coupling, in proximity with a superconductor and an external magnetic field applied parallel to the nanowire. The...
master thesis 2012
document
Smit, J.J. (author), Andritsch, T. (author), Chevtchenko, O.A. (author)
Assets in high voltage technology have to meet harsh service conditions over long lifetimes of 40 years or more. Due to environmental concerns, substitution of conventional insulating materials becomes a necessity. Because robustness and sustainability are serious requirements, only few new materials are really breaking through. At present some...
journal article 2012
document
Etaki, S. (author)
Mechanical sensors are essential tools for the detection of small forces. This thesis presents the dc SQUID as a detector for the displacement of embedded micromechanical resonators. The device geometry and basic operating principle are described. The SQUID displacement detector reaches an excellent resolution, a factor of 1.5 below the standard...
doctoral thesis 2012
document
Rashid, M. (author)
The electromagnetic waves are considered in this article as the mediators of interaction in the Meissner Effect or the diamagnetic property of the superconductors. During the cooling of a superconductor electromagnetic waves may be released when the electrons occupy lower states of the energy. These electromagnetic waves may combine in...
journal article 2011
document
Vercruyssen, N. (author), Barends, R. (author), Klapwijk, T.M. (author), Muhonen, J.T. (author), Meschke, M. (author), Pekola, J.P. (author)
We demonstrate an increased quasiparticle recombination time in superconducting resonators on a SiNx membrane, compared to identical resonators on a SiNx/Si wafer. An interpretation is given using a thermal model of the membrane. Using an array of tunnel junctions to cool or heat the membrane, we show that the resonators on the membranes are...
journal article 2011
Searched for: subject:"superconductors"
(1 - 20 of 48)

Pages