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Fu, X. (author), Ebner, Q. A. (author), Shi, Q. (author), Zudov, M. A. (author), Qian, Q. (author), Watson, J.D. (author), Manfra, M. J. (author)We performed effective mass measurements employing microwave-induced resistance oscillation in a tunable-density GaAs/AlGaAs quantum well. Our main result is a clear observation of an effective mass increase with decreasing density, in general agreement with earlier studies which investigated the density dependence of the effective mass...journal article 2017
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Shi, Q. (author), Zudov, M. A. (author), Qian, Q. (author), Watson, J.D. (author), Manfra, M. J. (author)We investigate quantum Hall stripes under an in-plane magnetic field B in a variable-density two-dimensional electron gas. At filling factor ν=9/2, we observe one, two, and zero Binduced reorientations at low, intermediate, and high densities, respectively. The appearance of these distinct regimes is due to a strong density dependence of the...journal article 2017
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van Veen, J. (author), Proutski, A. (author), Karzig, Torsten (author), Pikulin, D. (author), Lutchyn, Roman M. (author), Nygård, Jesper (author), Krogstrup, P. (author), Geresdi, A. (author), Kouwenhoven, Leo P. (author), Watson, J.D. (author)Parity control of superconducting islands hosting Majorana zero modes (MZMs) is required to operate topological qubits made from proximitized semiconductor nanowires. We test this control by studying parity effects in hybrid InAs-Al single-Cooper-pair transistors (SCPTs) to evaluate the feasibility of this material system. In particular, we...journal article 2018
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van Veen, J. (author), de Jong, D. (author), Han, L. (author), Prosko, C.G. (author), Krogstrup, P. (author), Watson, J.D. (author), Kouwenhoven, Leo P. (author), Pfaff, W. (author)We report direct detection of charge tunneling between a quantum dot and a superconducting island through radio-frequency gate sensing. We are able to resolve spin-dependent quasiparticle tunneling as well as two-particle tunneling involving Cooper pairs. The quantum dot can act as an RF-only sensor to characterize the superconductor addition...journal article 2019
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de Jong, D. (author), van Veen, J. (author), Binci, L. (author), Singh, A. (author), Krogstrup, P. (author), Kouwenhoven, Leo P. (author), Pfaff, W. (author), Watson, J.D. (author)Dispersive sensing is a powerful technique that enables scalable and high-fidelity readout of solid-state quantum bits. In particular, gate-based dispersive sensing has been proposed as the readout mechanism for future topological qubits, which can be measured by single electrons tunneling through zero-energy modes. The development of such a...journal article 2019