Searched for: author%3A%22Bakkers%2C+E.P.A.M.%22
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Gül, Önder (author), Zhang, H. (author), Bommer, J.D.S. (author), de Moor, M.W.A. (author), Car, Diana (author), Plissard, Sébastien R. (author), Bakkers, E.P.A.M. (author), Geresdi, A. (author), Kouwenhoven, Leo P. (author)
Correction to: Nature Nanotechnologyhttps://doi.org/10.1038/s41565-017-0032-8, published online 15 January 2018. The Letter reports Majorana signatures in hybrid InSb semiconductor nanowire–NbTiN superconductor devices. The devices exhibit a conductance plateau near the conductance quantum 2e<sup>2</sup>/h at bias voltages above the...
journal article 2024
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Ungerer, J. H. (author), Chevalier Kwon, P. (author), Patlatiuk, T. (author), Ridderbos, J. (author), Kononov, A. (author), Sarmah, D. (author), Bakkers, E.P.A.M. (author), Zumbühl, D. (author), Schönenberger, C. (author)
Spin qubits in germanium are a promising contender for scalable quantum computers. Reading out of the spin and charge configuration of quantum dots formed in Ge/Si core/shell nanowires is typically performed by measuring the current through the nanowire. Here, we demonstrate a more versatile approach on investigating the charge configuration...
journal article 2023
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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
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Bommer, J.D.S. (author), Zhang, Hao (author), Gül, Önder (author), Nijholt, B. (author), Wimmer, M.T. (author), Rybakov, Filipp N. (author), Garaud, Julien (author), Car, Diana (author), Plissard, Sébastien R. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author)
Spin-orbit interaction (SOI) plays a key role in creating Majorana zero modes in semiconductor nanowires proximity coupled to a superconductor. We track the evolution of the induced superconducting gap in InSb nanowires coupled to a NbTiN superconductor in a large range of magnetic field strengths and orientations. Based on realistic...
journal article 2019
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Kroll, J. (author), Borsoi, F. (author), van der Enden, K.L. (author), Uilhoorn, W. (author), de Jong, D. (author), Quintero Perez, M. (author), van Woerkom, D.J. (author), Bruno, A. (author), Plissard, S. R. (author), Car, D. (author), Bakkers, E.P.A.M. (author), Cassidy, M.C. (author), Kouwenhoven, Leo P. (author)
Superconducting coplanar-waveguide resonators that can operate in strong magnetic fields are important tools for a variety of high-frequency superconducting devices. Magnetic fields degrade resonator performance by creating Abrikosov vortices that cause resistive losses and frequency fluctuations or suppress the superconductivity entirely. To...
journal article 2019
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Cavalli, A (author), Haverkort, JEM (author), Bakkers, E.P.A.M. (author)
Nanowires are ideal building blocks for next-generation solar cell applications. Nanowires grown with the selective area (SA) approach, in particular, have demonstrated very high material quality, thanks to high growth temperature, defect-free crystalline structure, and absence of external catalysts, especially in the InP material system. A...
journal article 2019
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Lee, Joon Sue (author), Koelling, Sebastian (author), Verheijen, Marcel A. (author), Petkovic, Ivana (author), Schaller, V. (author), Marcus, Charles M. (author), Krogstrup, Peter (author), Kouwenhoven, Leo P. (author), Bakkers, E.P.A.M. (author)
We report on the selective-area chemical beam epitaxial growth of InAs in-plane, one-dimensional (1D) channels using patterned SiO2-coated InP(001), InP(111)B, and InP(011) substrates to establish a scalable platform for topological superconductor networks. Top-view scanning electron micrographs show excellent surface selectivity and...
journal article 2019
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Ridderbos, Joost (author), Brauns, Matthias (author), Li, Ang (author), Bakkers, E.P.A.M. (author), Brinkman, Alexander (author), Van Der Wiel, Wilfred G. (author), Zwanenburg, Floris A. (author)
We present a Josephson junction based on a Ge-Si core-shell nanowire with transparent superconducting Al contacts, a building block which could be of considerable interest for investigating Majorana bound states, superconducting qubits, and Andreev (spin) qubits. We demonstrate the dc Josephson effect in the form of a finite supercurrent...
journal article 2019
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de Vries, F.K. (author), Sol, M.L. (author), Gazibegovic, S. (author), op het Veld, R.L.M. (author), Balk, S.C. (author), Car, D. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author), Shen, J. (author)
We study superconducting quantum interference in InSb flake Josephson junctions. An even-odd effect in the amplitude and periodicity of the superconducting quantum interference pattern is found. Interestingly, the occurrence of this pattern coincides with enhanced conduction at both edges of the flake, as is deduced from measuring a...
journal article 2019
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Froning, F. N.M. (author), Rehmann, M. K. (author), Ridderbos, J. (author), Brauns, M. (author), Zwanenburg, F. A. (author), Li, A. (author), Bakkers, E.P.A.M. (author), Zumbühl, D. M. (author), Braakman, F. R. (author)
We report highly tunable control of holes in Ge/Si core/shell nanowires. We demonstrate the ability to create single quantum dots of various sizes, with low hole occupation numbers and clearly observable excited states. For the smallest dot size, we observe indications of single-hole occupation. Moreover, we create double and triple tunnel...
journal article 2018
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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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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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Shen, J. (author), Heedt, S. (author), Borsoi, F. (author), van Heck, B. (author), Gazibegovic, S. (author), op het Veld, R.L.M. (author), Car, D. (author), Ramakers, S.J.J. (author), Wang, Guanzhong (author), Xu, D. (author), Bouman, D. (author), Geresdi, A. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author)
The number of electrons in small metallic or semiconducting islands is quantised. When tunnelling is enabled via opaque barriers this number can change by an integer. In superconductors the addition is in units of two electron charges (2e), reflecting that the Cooper pair condensate must have an even parity. This ground state (GS) is...
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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Lutchyn, R. M. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author), Krogstrup, P. (author), Marcus, C.M. (author), Oreg, Y. (author)
Realizing topological superconductivity and Majorana zero modes in the laboratory is a major goal in condensed-matter physics. In this Review, we survey the current status of this rapidly developing field, focusing on proposals for the realization of topological superconductivity in semiconductor–superconductor heterostructures. We examine...
journal article 2018
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Oener, Sebastian Z. (author), Cavalli, A. (author), Sun, Hongyu (author), Haverkort, Jos E.M. (author), Bakkers, E.P.A.M. (author), Garnett, Erik C. (author)
Charge carrier-selective contacts transform a light-absorbing semiconductor into a photovoltaic device. Current record efficiency solar cells nearly all use advanced heterojunction contacts that simultaneously provide carrier selectivity and contact passivation. One remaining challenge with heterojunction contacts is the tradeoff between...
journal article 2018
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Su, Zhaoen (author), Tacla, Alexandre B. (author), Hocevar, Moïra (author), Car, Diana (author), Plissard, Sébastien R. (author), Bakkers, E.P.A.M. (author), Daley, Andrew J. (author), Pekker, David (author), Frolov, Sergey M. (author)
Chains of quantum dots coupled to superconductors are promising for the realization of the Kitaev model of a topological superconductor. While individual superconducting quantum dots have been explored, control of longer chains requires understanding of interdot coupling. Here, double quantum dots are defined by gate voltages in indium...
journal article 2017
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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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Zuo, K. (author), Mourik, V. (author), Szombati, D.B. (author), Nijholt, B. (author), van Woerkom, D.J. (author), Geresdi, A. (author), Chen, Jun (author), Ostroukh, Viacheslav P. (author), Akhmerov, A.R. (author), Plissard, S.R. (author), Car, D. (author), Bakkers, E.P.A.M. (author), Pikulin, Dmitry I. (author), Kouwenhoven, Leo P. (author), Frolov, S.M. (author)
Junctions created by coupling two superconductors via a semiconductor nanowire in the presence of high magnetic fields are the basis for the potential detection, fusion, and braiding of Majorana bound states. We study NbTiN/InSb nanowire/NbTiN Josephson junctions and find that the dependence of the critical current on the magnetic field...
journal article 2017
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