Searched for: department%3A%22Kavli%255C+Institute%255C+of%255C+Nanoscience%22
(81 - 100 of 353)
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Peropadre, B. (author), Forn-Diaz, P. (author), Solano, E. (author), Garcia-Ripoll, J.J. (author)We propose different designs of switchable coupling between a superconducting flux qubit and a microwave transmission line. They are based on two or more loops of Josephson junctions which are directly connected to a closed (cavity) or open transmission line. In both cases the circuit induces a coupling that can be modulated in strength,...journal article 2010
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Van Tilburg, J.W.W. (author)For small magnetic memories, the ultimate limit is a single magnetic particle, a single electron spin. A lot of research is put in developing devices that can utilize such a single spin memory. At the same time, there is also interest from a more fundamental point of view: on these small scales, Quantum Mechanics starts to play a role. Devices...doctoral thesis 2010
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Götz, G.T.J. (author)We experimentally investigate Quantum Dots, formed in Carbon Nanotubes. The first part of this thesis deals with charge sensing on such quantum dots. The charge sensor is a metallic Single-electron-transistor, sensitive to the charge of a single electron on the quantum dot. We use this technique for real-time charge readout and precise tuning of...doctoral thesis 2010
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Johnson, B.C. (author), Tettamanzi, G.C. (author), Alves, A.D.C. (author), Thompson, S. (author), Yang, C. (author), Verduijn, J. (author), Mol, J.A. (author), Wacquez, R. (author), Vinet, M. (author), Sanquer, M. (author), Rogge, S. (author), Jamieson, D.N. (author)We demonstrate single dopant implantation into the channel of a silicon nanoscale metal-oxide-semiconductor field-effect-transistor. This is achieved by monitoring the drain current modulation during ion irradiation. Deterministic doping is crucial for overcoming dopant number variability in present nanoscale devices and for exploiting single...journal article 2010
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Van Weert, M. (author)The research described in this thesis is aimed at constructing a quantum interface between a single electron spin and a photon, using a nanowire quantum dot. Such a quantum interface enables information transfer from a local electron spin to the polarization of a photon for long distance readout. Important aspects for the realization of such a...doctoral thesis 2010
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Van Kouwen, M.P. (author)An important goal for nanoscale opto-electronics is the transfer of single electron spin states into single photon polarization states (and vice versa), thereby interfacing quantum transport and quantum optics. Such an interface enables new experiments in the field of quantum information processing. Single and entangled photon-pair generation...doctoral thesis 2010
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Xiao, J. (author), Bauer, G.E.W. (author), Uchida, K. (author), Saitoh, E. (author), Maekawa, S. (author)The spin Seebeck effect is a spin-motive force generated by a temperature gradient in a ferromagnet that can be detected via normal metal contacts through the inverse spin Hall effect [K. Uchida et al., Nature (London) 455, 778 (2008)]. We explain this effect by spin pumping at the contact that is proportional to the spin-mixing conductance of...journal article 2010
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Van Weert, M.H.M. (author), Den Heijer, M. (author), Van Kouwen, M.P. (author), Algra, R.E. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, L.P. (author), Zwiller, V. (author)We report voltage dependent photoluminescence experiments on single indium arsenide phosphide (InAsP) quantum dots embedded in vertical surround-gated indium phosphide (InP) nanowires. We show that by tuning the gate voltage, we can access different quantum dot charge states. We study the anisotropic exchange splitting by polarization analysis,...journal article 2010
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Martin, C.A. (author), Van Ruitenbeek, J.M. (author), Van der Zant, H.S.J. (author)We introduce a new device architecture for the independent mechanical and electrostatic tuning of nanoscale charge transport. In contrast to previous gated mechanical break junctions with suspended source–drain electrodes, the devices presented here prevent an electromechanical tuning of the electrode gap by the gate. This significant...journal article 2010
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Nakano, M. (author), Alves, H. (author), Molinari, A.S. (author), Ono, S. (author), Minder, N. (author), Morpurgo, A.F. (author)We investigated transport properties of organic heterointerfaces formed by single-crystals of two organic donor-acceptor molecules, tetramethyltetraselenafulvalene and 7,7,8,8-tetracyanoquinodimethane (TCNQ). Whereas the individual crystals have unmeasurably high resistance, the interface exhibits a resistivity of few tens of megohm with a...journal article 2010
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Tanner, M.G. (author), Natarajan, C.M. (author), Pottapenjara, V.K. (author), O'Connor, J.A. (author), Warburton, R.J. (author), Hadfield, R.H. (author), Baek, B. (author), Nam, S. (author), Dorenbos, S.N. (author), Bermúdez Ureña, E. (author), Zijlstra, T. (author), Klapwijk, T.M. (author), Zwiller, V. (author)Superconducting nanowire single-photon detectors (SNSPDs) have emerged as a highly promising infrared single-photon detector technology. Next-generation devices are being developed with enhanced detection efficiency (DE) at key technological wavelengths via the use of optical cavities. Furthermore, new materials and substrates are being explored...journal article 2010
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Dündar, M.A. (author), Christova, C. (author), Silov, A.Y. (author), Karouta, F. (author), Nötzel, R. (author), Wienk, M. (author), Salemink, H. (author), Van der Heijden, R. (author)Liquid crystal (LC, Merk 5 CB) is infiltrated into active, InAs quantum dots embedded, InGaAsP membrane type nanocavities to investigate the possible effect of the LC orientation on active cavity tuning. The tuning is demonstrated thermally and thermo-optically. The thermal tuning showed that the cavity modes can be tuned in opposite directions...conference paper 2010
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Oostinga, J.B. (author), Sacépé, B. (author), Craciun, M.F. (author), Morpurgo, A.F. (author)We investigate magnetotransport through graphene nanoribbons as a function of gate and bias voltage, and temperature. We find that a magnetic field systematically leads to an increase in the conductance on a scale of a few tesla. This phenomenon is accompanied by a decrease in the energy scales associated to charging effects, and to hopping...journal article 2010
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Seldenthuis, J.S. (author), Van der Zant, H.S.J. (author), Ratner, M.A. (author), Thijssen, J.M. (author)We have combined ab initio quantum chemistry calculations with a rate-equation formalism to analyze electroluminescence spectra in single-molecule junctions, measured recently by several groups in scanning tunneling microscope setups. In our method, the entire vibrational spectrum is taken into account. Our method leads to good quantitative...journal article 2010
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Nadj-Perge, S. (author), Frolov, S.M. (author), Van Tilburg, J.W.W. (author), Danon, J. (author), Nazarov, Y.V. (author), Algra, R. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, L.P. (author)We have achieved the few-electron regime in InAs nanowire double quantum dots. Spin blockade is observed for the first two half-filled orbitals, where the transport cycle is interrupted by forbidden transitions between triplet and singlet states. Partial lifting of spin blockade is explained by spin-orbit and hyperfine mechanisms that enable...journal article 2010
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Laakso, M.A. (author), Heikkilä, T.T. (author), Nazarov, Y.V. (author)We consider the fully overheated single-electron transistor, where the heat balance is determined entirely by electron transfers. We find three distinct transport regimes corresponding to cotunneling, single-electron tunneling, and a competition between the two. We find an anomalous sensitivity to temperature fluctuations at the crossover...journal article 2010
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Padurariu, C. (author), Nazarov, Y.V. (author)We propose and theoretically investigate superconducting spin qubits. Superconducting spin qubit consists of a single spin confined in a Josephson junction. We show that owing to spin-orbit interaction, superconducting phase difference across the junction can polarize this spin. We demonstrate that this enables single-qubit operations and more...journal article 2010
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Oostinga, J.B. (author)After the experimental discovery of graphene -a single atomic layer of graphite- a scientific rush started to explore graphene’s electronic behaviour. Graphene is a fascinating two-dimensional electronic system, because its electrons behave as relativistic particles. Moreover, it is a promising material for future high-speed nano-electronic...doctoral thesis 2010
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Recher, P. (author), Nazarov, Y.V. (author), Kouwenhoven, L.P. (author)We consider an optical quantum dot where an electron level and a hole level are coupled to respective superconducting leads. We find that electrons and holes recombine producing photons at discrete energies as well as a continuous tail. Further, the spectral lines directly probe the induced superconducting correlations on the dot. At energies...journal article 2010
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De Groot, P.C. (author), Van Loo, A.F. (author), Lisenfeld, J. (author), Schouten, R.N. (author), Lupa?cu, A. (author), Harmans, C.J.P.M. (author), Mooij, J.E. (author)We present experimental results on the crosstalk between two ac-operated dispersive bifurcation detectors, implemented in a circuit for high-fidelity readout of two strongly coupled flux qubits. Both phase-dependent and phase-independent contributions to the crosstalk are analyzed. For proper tuning of the phase the measured crosstalk is 0.1%...journal article 2010
Searched for: department%3A%22Kavli%255C+Institute%255C+of%255C+Nanoscience%22
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