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van Veen, J. (author)Quantum computers can solve some problems exponentially faster than classical computers. Unfortunately, the computational power of quantum computers is currently limited by the number of working qubits. It is difficult to scale up these systems, because qubits are easily affected by noise in their environment. This noise leads to decoherence:...doctoral thesis 2019
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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
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Aseev, P. (author), Fursina, A. (author), Boekhout, F. (author), Borsoi, F. (author), Heedt, S. (author), Wang, Guanzhong (author), Binci, L. (author), Koops, R. (author), Uccelli, E. (author), Kouwenhoven, Leo P. (author), Caroff-Gaonac'h, P. (author)Selective-area growth is a promising technique for enabling of the fabrication of the scalable III-V nanowire networks required to test proposals for Majorana-based quantum computing devices. However, the contours of the growth parameter window resulting in selective growth remain undefined. Herein, we present a set of experimental techniques...journal article 2019
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Vismara, R. (author), Isabella, O. (author), Ingenito, A. (author), Si, F.T. (author), Zeman, M. (author)Background: Elongated nanostructures, such as nanowires, have attracted significant attention for application in silicon-based solar cells. The high aspect ratio and characteristic radial junction configuration can lead to higher device performance, by increasing light absorption and, at the same time, improving the collection efficiency of...journal article 2019
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Hubbe, H.M.K. (author), Mendes, E. (author), Boukany, P. (author)Polymer nanowire-related research has shown considerable progress over the last decade. The wide variety of materials and the multitude of well-established chemical modifications have made polymer nanowires interesting as a functional part of a diagnostic biosensing device. This review provides an overview of relevant publications addressing...review 2019
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Elsinger, Lukas (author), Gourgues, R.B.M. (author), Esmaeil Zadeh, I.Z. (author), Maes, Jorick (author), Guardiani, A. (author), Bulgarini, G. (author), Pereira, S.F. (author), Dorenbos, S.N. (author), Zwiller, V.G. (author)Single-photon sources and detectors are indispensable building blocks for integrated quantum photonics, a research field that is seeing ever increasing interest for numerous applications. In this work, we implemented essential components for a quantum key distribution transceiver on a single photonic chip. Plasmonic antennas on top of silicon...journal article 2019
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Zhang, H. (author), Liu, Chun Xiao (author), Gazibegovic, S. (author), Xu, D. (author), Logan, John A. (author), Wang, Guanzhong (author), van Loo, N. (author), Bommer, J.D.S. (author), de Moor, M.W.A. (author), Car, D. (author), op het Veld, R.L.M. (author), Van Veldhoven, Petrus J. (author), Kölling, S. (author), Verheijen, M.P.A.M. (author), Pendharkar, Mihir (author), Pennachio, Daniel J. (author), Shojaei, Borzoyeh (author), Lee, Joon Sue (author), Palmstrøm, Chris J. (author), Bakkers, E.P.A.M. (author), Sarma, S. Das (author), Kouwenhoven, Leo P. (author)Majorana zero-modes - a type of localized quasiparticle - hold great promise for topological quantum computing. Tunnelling spectroscopy in electrical transport is the primary tool for identifying the presence of Majorana zero-modes, for instance as a zero-bias peak in differential conductance. The height of the Majorana zero-bias peak is...journal article 2018
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Istas, Mathieu (author), Groth, Christoph (author), Akhmerov, A.R. (author), Wimmer, M.T. (author), Waintal, Xavier (author)We propose a robust and efficient algorithm for computing bound states of infinite tight-binding systems that are made up of a finite scattering region connected to semi-infinite leads. Our method uses wave matching in close analogy to the approaches used to obtain propagating states and scattering matrices. We show that our algorithm is robust...journal article 2018
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Stepniowski, W.J. (author), Moneta, Marcin (author), Karczewski, Krzysztof (author), Michalska-Domanska, Marta (author), Czujko, Tomasz (author), Mol, J.M.C. (author), Buijnsters, J.G. (author)Anodic aluminum oxide was formed by employing mild and hard anodizing in sulfuric acid followed by mild anodizing in oxalic acid without oxide removal in-between at 40 and 45 V. Such multi-step anodizing, combining hard anodizing in sulfuric acid with mild anodizing in oxalic acid allowed to form a highly-ordered nanoporous template with a...journal article 2018
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de Moor, M.W.A. (author), Bommer, J.D.S. (author), Xu, D. (author), Winkler, Georg W. (author), Antipov, Andrey E. (author), Bargerbos, A. (author), Wang, Guanzhong (author), van Loo, N. (author), op het Veld, R.L.M. (author), Gazibegovic, S. (author), Car, D. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author), Zhang, H. (author)We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity...journal article 2018
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de Vries, F.K. (author), Shen, J. (author), Skolasinski, R.J. (author), Nowak, M.P. (author), Varjas, D. (author), Wang, L. (author), Wimmer, M.T. (author), Zwanenburg, F.A. (author), Li, A. (author), Kölling, S. (author), Verheijen, M.P.A.M. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author)Low dimensional semiconducting structures with strong spin-orbit interaction (SOI) and induced superconductivity attracted great interest in the search for topological superconductors. Both the strong SOI and hard superconducting gap are directly related to the topological protection of the predicted Majorana bound states. Here we explore the...journal article 2018
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Gagliano, L. (author), Kruijsse, M. (author), Schefold, J. D.D. (author), Belabbes, A. (author), Verheijen, M.P.A.M. (author), Meuret, S. (author), Kölling, S. (author), Polman, A. (author), Bechstedt, F. (author), Haverkort, J. E.M. (author), Bakkers, E.P.A.M. (author)Direct band gap III-V semiconductors, emitting efficiently in the amber-green region of the visible spectrum, are still missing, causing loss in efficiency in light emitting diodes operating in this region, a phenomenon known as the "green gap". Novel geometries and crystal symmetries however show strong promise in overcoming this limit. Here...journal article 2018
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Fadaly, E.M.T. (author), Zhang, H. (author), Conesa Boj, S. (author), Car, D. (author), Gül, Önder (author), Plissard, Sébastien R. (author), op het Veld, R.L.M. (author), Kölling, Sebastian (author), Kouwenhoven, Leo P. (author), Bakkers, E.P.A.M. (author)Majorana zero modes (MZMs) are prime candidates for robust topological quantum bits, holding a great promise for quantum computing. Semiconducting nanowires with strong spin orbit coupling offer a promising platform to harness one-dimensional electron transport for Majorana physics. Demonstrating the topological nature of MZMs relies on...journal article 2017
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Gül, Önder (author)The dissertation reports a series of electron transport experiments on semiconductor nanowires towards realizing the hypothesized topological quantum computation. A topological quantum computer manipulates information that is stored nonlocally in the topology of a physical system. Such an operation possesses advantages over the current quantum...doctoral thesis 2017
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Assali, S. (author), Lähnemann, J. (author), Vu, TTT (author), Jöns, K.D. (author), Gagliano, L (author), Verheijen, M. A. (author), Akopian, N. (author), Bakkers, E.P.A.M. (author), Haverkort, J. E.M. (author)One of the major challenges in the growth of quantum well and quantum dot heterostructures is the realization of atomically sharp interfaces. Nanowires provide a new opportunity to engineer the band structure as they facilitate the controlled switching of the crystal structure between the zinc-blende (ZB) and wurtzite (WZ) phases. Such a...journal article 2017
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Kammhuber, J. (author), Cassidy, M.C. (author), Pei, F. (author), Nowak, M.P. (author), Vuik, A. (author), Gül, Önder (author), Car, D. (author), Plissard, S.R. (author), Bakkers, E.P.A.M. (author), Wimmer, M.T. (author), Kouwenhoven, Leo P. (author)The motion of an electron and its spin are generally not coupled. However in a one-dimensional material with strong spin-orbit interaction (SOI) a helical state may emerge at finite magnetic fields, where electrons of opposite spin will have opposite momentum. The existence of this helical state has applications for spin filtering and cooper...journal article 2017
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van Woerkom, D.J. (author)Due to the collective behavior of electrons, exotic states can appear in condensed matter systems. In this PhD thesis, we investigate semiconducting nanowire Josephson junctions that potentially have Majorana zero modes (MZM) as exotic states. MZM are expected to form a robust quantum bit and quantum operations are done by interchange, otherwise...doctoral thesis 2017
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Gül, Önder (author), Zhang, H. (author), de Vries, F.K. (author), van Veen, J. (author), Zuo, K. (author), Mourik, V. (author), Conesa Boj, S. (author), Nowak, M.P. (author), van Woerkom, D.J. (author), Quintero Perez, M. (author), Cassidy, M.C. (author), Geresdi, A. (author), Koelling, Sebastian (author), Car, D. (author), Plissard, S.R. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author)Topological superconductivity is a state of matter that can host Majorana modes, the building blocks of a topological quantum computer. Many experimental platforms predicted to show such a topological state rely on proximity-induced superconductivity. However, accessing the topological properties requires an induced hard superconducting gap,...journal article 2017
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Stepniowski, W.J. (author), Stojadinović, Stevan (author), Vasilić, Rastko (author), Tadić, Nenad (author), Karczewski, Krzysztof (author), Abrahami, S.T. (author), Buijnsters, J.G. (author), Mol, J.M.C. (author)Copper foil was anodized in 1 M KOH at potentials ranging from −400 to −100 mV vs. Ag|AgCl electrode. Cyclic voltammetry showed a distinct peak with a maximum at around −150 mV. For anodizing at −100 and −200 mV, nanowires with diameters of ca. 19 and 24 nm respectively were found to be grown. Moreover, photoluminescence and X-ray diffraction...journal article 2017
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Janissen, R. (author), Sahoo, Prasana K. (author), Santos, Clelton A. (author), Da Silva, Aldeliane M. (author), Von Zuben, Antonio A.G. (author), Souto, Denio E.P. (author), Costa, Alexandre D.T. (author), Celedon, Paola (author), Zanchin, Nilson I.T. (author), Almeida, Diogo B. (author), Oliveira, Douglas S. (author)Electrically active field-effect transistors (FET) based biosensors are of paramount importance in life science applications, as they offer direct, fast, and highly sensitive label-free detection capabilities of several biomolecules of specific interest. In this work, we report a detailed investigation on surface functionalization and...journal article 2017