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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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Bordin, A. (author), Wang, Guanzhong (author), Liu, Chun Xiao (author), ten Haaf, S.L.D. (author), van Loo, N. (author), Mazur, G.P. (author), Xu, D. (author), van Driel, D. (author), Zatelli, F. (author), Gazibegovic, Sasa (author), Badawy, Ghada (author), Bakkers, Erik P.A.M. (author), Wimmer, M.T. (author), Kouwenhoven, Leo P. (author), Dvir, T. (author)A short superconducting segment can couple attached quantum dots via elastic cotunneling (ECT) and crossed Andreev reflection (CAR). Such coupled quantum dots can host Majorana bound states provided that the ratio between CAR and ECT can be controlled. Metallic superconductors have so far been shown to mediate such tunneling phenomena, albeit...journal article 2023
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van Driel, D. (author), Wang, Guanzhong (author), Bordin, A. (author), van Loo, N. (author), Zatelli, F. (author), Mazur, G.P. (author), Xu, D. (author), Gazibegovic, Sasa (author), Badawy, Ghada (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), Dvir, T. (author)Semiconductor nanowires coupled to superconductors can host Andreev bound states with distinct spin and parity, including a spin-zero state with an even number of electrons and a spin-1/2 state with odd-parity. Considering the difference in spin of the even and odd states, spin-filtered measurements can reveal the underlying ground state. To...journal article 2023
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Levajac, V. (author), Mazur, G.P. (author), van Loo, N. (author), Borsoi, F. (author), Badawy, Ghada (author), Gazibegovic, Sasa (author), Bakkers, Erik P.A.M. (author), Heedt, S. (author), Kouwenhoven, Leo P. (author), Wang, J. (author)Semiconducting nanowire Josephson junctions represent an attractive platform to investigate the anomalous Josephson effect and detect topological superconductivity. However, an external magnetic field generally suppresses the supercurrent through hybrid nanowire junctions and significantly limits the field range in which the supercurrent...journal article 2023
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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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Dvir, T. (author), Wang, Guanzhong (author), van Loo, N. (author), Liu, C. (author), Mazur, G.P. (author), Bordin, A. (author), ten Haaf, S.L.D. (author), van Driel, D. (author), Zatelli, F. (author), Li, X. (author), Malinowski, F.K. (author), Gazibegovic, Sasa (author), Badawy, G.H.A. (author), Bakkers, Erik P.A.M. (author), Wimmer, M.T. (author), Kouwenhoven, Leo P. (author)Majorana bound states constitute one of the simplest examples of emergent non-Abelian excitations in condensed matter physics. A toy model proposed by Kitaev shows that such states can arise at the ends of a spinless p-wave superconducting chain<sup>1</sup>. Practical proposals for its realization<sup>2,3</sup> require coupling neighbouring...journal article 2023
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Levajac, V. (author), Wang, Ji Yin (author), Sfiligoj, C. (author), Lemang, M.F. (author), Wolff, J.C. (author), Bordin, A. (author), Badawy, G.H.A. (author), Gazibegovic, Sasa (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author)Tunneling spectroscopy is widely used to examine the subgap spectra in semiconductor-superconductor nanostructures when searching for Majorana zero modes (MZMs). Typically, semiconductor sections controlled by local gates at the ends of hybrids serve as tunnel barriers. Besides detecting states only at the hybrid ends, such gate-defined...journal article 2023
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Han, L. (author), Chan, M. (author), de Jong, D. (author), Prosko, C.G. (author), Badawy, Ghada (author), Gazibegovic, Sasa (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), Malinowski, F.K. (author), Pfaff, Wolfgang (author)Utilizing dispersive gate sensing (DGS), we investigate the spin-orbit field (BSO) orientation in a many-electron double quantum dot (DQD) defined in an InSb nanowire. While characterizing the interdot tunnel couplings, we find the measured dispersive signal depends on the electron-charge occupancy, as well as on the amplitude and orientation...journal article 2023
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Wang, Guanzhong (author), Dvir, T. (author), Mazur, G.P. (author), Liu, C. (author), van Loo, N. (author), ten Haaf, S.L.D. (author), Bordin, A. (author), Gazibegovic, Sasa (author), Badawy, G.H.A. (author), Bakkers, Erik P.A.M. (author), Wimmer, M.T. (author), Kouwenhoven, Leo P. (author)In most naturally occurring superconductors, electrons with opposite spins form Cooper pairs. This includes both conventional s-wave superconductors such as aluminium, as well as high-transition-temperature, d-wave superconductors. Materials with intrinsic p-wave superconductivity, hosting Cooper pairs made of equal-spin electrons, have not...journal article 2022
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Wang, Guanzhong (author), Dvir, T. (author), van Loo, N. (author), Mazur, G.P. (author), Gazibegovic, Sasa (author), Badawy, G.H.A. (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), de Lange, G. (author)The lowest-energy excitations of superconductors do not carry an electric charge, as their wave function is equally electron-like and hole-like. This fundamental property is not easy to study in electrical measurements that rely on the charge to generate an observable signal. The ability of a quantum dot to act as a charge filter enables us...journal article 2022
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Malinowski, F.K. (author), Han, L. (author), de Jong, D. (author), Wang, Ji Yin (author), Prosko, C.G. (author), Krogstrup, Peter (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), Koski, Jonne V. (author)We demonstrate the use of radio-frequency (rf) resonators to measure the capacitance of nanoscale semiconducting devices in field-effect transistor configurations. The rf resonator is attached to the gate or the lead of the device. Consequently, tuning the carrier density in the conducting channel of the device affects the resonance frequency...journal article 2022
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Borsoi, F. (author), Zuo, Kun (author), Gazibegovic, Sasa (author), op het Veld, R.L.M. (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), Heedt, S. (author)Detecting the transmission phase of a quantum dot via interferometry can reveal the symmetry of the orbitals and details of electron transport. Crucially, interferometry will enable the read-out of topological qubits based on one-dimensional nanowires. However, measuring the transmission phase of a quantum dot in a nanowire has not yet been...journal article 2020
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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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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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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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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