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Relaxation of the resistive superconducting state in boron-doped diamond films

Kardakova, A. (author), Shishkin, A. (author), Semenov, A. (author), Goltsman, G.N. (author), Ryabchun, S. (author), Klapwijk, T.M. (author), Bousquet, J. (author), Eon, D. (author), Sacépé, B. (author), Klein, T. (author), Bustarret, E. (author)

We report a study of the relaxation time of the restoration of the resistive superconducting state in single crystalline boron-doped diamond using amplitude-modulated absorption of (sub-)THz radiation (AMAR). The films grown on an insulating diamond substrate have a low carrier density of about 2.5×1021cm?3 and a critical temperature of about 2K...

journal article 2016

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Giant negative magnetoresistance driven by spin-orbit coupling at the LaAlO3/SrTiO3 interface

Diez, M. (author), Rincon Vieira Lugarinho Monte, A.M. (author), Mattoni, G. (author), Cobanera, E. (author), Hyart, T. (author), Mulazimoglu, E. (author), Bovenzi, N. (author), Beenakker, C.W.J. (author), Caviglia, A. (author)

The LaAlO3=SrTiO3 interface hosts a two-dimensional electron system that is unusually sensitive to the application of an in-plane magnetic field. Low-temperature experiments have revealed a giant negative magnetoresistance (dropping by 70%), attributed to a magnetic-field induced transition between interacting phases of conduction electrons with...

journal article 2015

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Optomechanical response of a nonlinear mechanical resonator

Shevchuk, O. (author), Singh, V. (author), Steele, G.A. (author), Blanter, Y.M. (author)

We investigate theoretically in detail the nonlinear effects in the response of an optical/microwave cavity coupled to a Duffing mechanical resonator. The cavity is driven by a laser at a red or blue mechanical subband, and a probe laser measures the reflection close to the cavity resonance. Under these conditions, we find that the cavity...

journal article 2015

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Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films

Aqeel, A. (author), Vlietstra, N. (author), Heuver, J.A. (author), Bauer, G.E.W. (author), Noheda, B. (author), Van Wees, B.J. (author), Palstra, T.T.M. (author)

We report on the spin-Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in multiferroic CoCr2O4 (CCO) spinel thin films with Pt contacts. We observe a large enhancement of both signals below the spin-spiral (Ts=28K) and the spin lock-in (Tlock?in=14K) transitions. The SMR and SSE responses in the spin lock-in phase are one order of...

journal article 2015

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Hydrodynamics Versus Intracellular Coupling in the Synchronization of Eukaryotic Flagella

Quaranta, G. (author), Aubin, M.E. (author), Tam, D.S.W. (author)

The influence of hydrodynamic forces on eukaryotic flagella synchronization is investigated by triggering phase locking between a controlled external flow and the flagella of C. reinhardtii. Hydrodynamic forces required for synchronization are over an order of magnitude larger than hydrodynamic forces experienced in physiological conditions. Our...

journal article 2015

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Collision model for fully resolved simulations of flows laden with finite-size particles

Costa, P. (author), Boersma, B.J. (author), Westerweel, J. (author), Breugem, W.P. (author)

We present a collision model for particle-particle and particle-wall interactions in interface-resolved simulations of particle-laden flows. Three types of interparticle interactions are taken into account: (1) long- and (2) short-range hydrodynamic interactions, and (3) solid-solid contact. Long-range interactions are incorporated through an...

journal article 2015

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Closing the proximity gap in a metallic Josephson junction between three superconductors

Padurariu, C. (author), Jonkcheere, T. (author), Melin, R. (author), Feinberg, D. (author), Martin, T. (author), Nazarov, Y.V. (author)

We describe the proximity effect in a short disordered metallic junction between three superconducting leads. Andreev bound states in the multiterminal junction may cross the Fermi level. We reveal that for a quasicontinuous metallic density of states, crossings at the Fermi level manifest as a closing of the proximity-induced gap. We calculate...

journal article 2015

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Relative velocity distribution of inertial particles in turbulence: A numerical study

Perrin, V.E. (author), Jonker, H.J.J. (author)

The distribution of relative velocities between particles provides invaluable information on the rates and characteristics of particle collisions. We show that the theoretical model of Gustavsson and Mehlig [K. Gustavsson and B. Mehlig, J. Turbul. 15, 34 (2014)], within its anticipated limits of validity, can predict the joint probability...

journal article 2015

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Current-induced spin torque resonance of a magnetic insulator

Schreier, M. (author), Chiba, T. (author), Niedermayr, A. (author), Lotze, J. (author), Huebl, H. (author), Geprags, S. (author), Takahashi, S. (author), Bauer, G.E.W. (author), Gross, R. (author), Goennenwein, S.T.B. (author)

We report the observation of current-induced spin torque resonance in yttrium iron garnet/platinum bilayers. An alternating charge current at GHz frequencies in the platinum gives rise to dc spin pumping and spin Hall magnetoresistance rectification voltages, induced by the Oersted fields of the ac current and the spin Hall effect-mediated spin...

journal article 2015

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Exact coupling threshold for structural transition reveals diversified behaviors in interconnected networks

Sahneh, F.D. (author), Scoglio, C. (author), Van Mieghem, P. (author)

An interconnected network features a structural transition between two regimes [F. Radicchi and A. Arenas, Nat. Phys. 9, 717 (2013)]: one where the network components are structurally distinguishable and one where the interconnected network functions as a whole. Our exact solution for the coupling threshold uncovers network topologies with...

journal article 2015

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Thermodynamic magnon recoil for domain wall motion

Yan, P. (author), Cao, Y. (author), Sinova, J. (author)

We predict a thermodynamic magnon recoil effect for domain wall motions in the presence of temperature gradients. All current thermodynamic theories assert that a magnetic domain wall must move toward the hotter side, based on equilibrium thermodynamic arguments. Microscopic calculations, on the other hand, show that a domain wall can move...

journal article 2015

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From epidemics to information propagation: Striking differences in structurally similar adaptive network models

Trajanovski, S. (author), Guo, D. (author), Van Mieghem, P.F.A. (author)

The continuous-time adaptive susceptible-infected-susceptible (ASIS) epidemic model and the adaptive information diffusion (AID) model are two adaptive spreading processes on networks, in which a link in the network changes depending on the infectious state of its end nodes, but in opposite ways: (i) In the ASIS model a link is removed between...

journal article 2015

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Realization of Microwave Quantum Circuits Using Hybrid Superconducting Semiconducting Nanowire Josephson Elements

De Lange, G. (author), Van Heck, B. (author), Bruno, A. (author), Van Woerkom, D.J. (author), Geresdi, A. (author), Plissard, S.R. (author), Bakkers, E.P.A.M. (author), Akhmerov, A.R. (author), Di Carlo, L. (author)

We report the realization of quantum microwave circuits using hybrid superconductor-semiconductor Josephson elements comprised of InAs nanowires contacted by NbTiN. Capacitively shunted single elements behave as transmon circuits with electrically tunable transition frequencies. Two-element circuits also exhibit transmonlike behavior near zero...

journal article 2015

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Universal Quantum Transducers Based on Surface Acoustic Waves

Schuetz, M.J.A. (author), Kessler, E.M. (author), Giedke, G. (author), Vandersypen, L.M.K. (author), Lukin, M.D. (author), Cirac, J.I. (author)

We propose a universal, on-chip quantum transducer based on surface acoustic waves in piezoactive materials. Because of the intrinsic piezoelectric (and/or magnetostrictive) properties of the material, our approach provides a universal platform capable of coherently linking a broad array of qubits, including quantum dots, trapped ions, nitrogen...

journal article 2015

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Second-Harmonic Coherent Driving of a Spin Qubit in a Si/SiGe Quantum Dot

Scarlino, P. (author), Kawakami, E. (author), Ward, D.R. (author), Savage, D.E. (author), Lagally, M.G. (author), Friesen, M. (author), Coppersmith, S.N. (author), Eriksson, M.A. (author), Vandersypen, L.M.K. (author)

We demonstrate coherent driving of a single electron spin using second-harmonic excitation in a Si/SiGe quantum dot. Our estimates suggest that the anharmonic dot confining potential combined with a gradient in the transverse magnetic field dominates the second-harmonic response. As expected, the Rabi frequency depends quadratically on the...

journal article 2015

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Survival time of the susceptible-infected-susceptible infection process on a graph

Van de Bovenkamp, R. (author), Van Mieghem, P. (author)

The survival time T is the longest time that a virus, a meme, or a failure can propagate in a network. Using the hitting time of the absorbing state in an uniformized embedded Markov chain of the continuous-time susceptible-infected-susceptible (SIS) Markov process, we derive an exact expression for the average survival time E[T ] of a virus in...

journal article 2015

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Fast long-distance control of spin qubits by photon-assisted cotunneling

Stano, P. (author), Klinovaja, J. (author), Braakman, F.R. (author), Vandersypen, L.M.K. (author), Loss, D. (author)

We investigate theoretically the long-distance coupling and spin exchange in an array of quantum dot spin qubits in the presence of microwaves. We find that photon-assisted cotunneling is boosted at resonances between photon and energies of virtually occupied excited states and show how to make it spin selective. We identify configurations that...

journal article 2015

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Electronic Origins of Anomalous Twin Boundary Energies in Hexagonal Close Packed Transition Metals

De Jong, M. (author), Kacher, J. (author), Sluiter, M.H.F. (author), Qi, L. (author), Olmsted, D.L. (author), Van de Walle, A. (author), Morris, J.W. (author), Minor, A.M. (author), Asta, M. (author)

Density-functional-theory calculations of twin-boundary energies in hexagonal close packed metals reveal anomalously low values for elemental Tc and Re, which can be lowered further by alloying with solutes that reduce the electron per atom ratio. The anomalous behavior is linked to atomic geometries in the interface similar to those observed in...

journal article 2015

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Quantum transport in carbon nanotubes

Laird, E.A. (author), Kuemmeth, F. (author), Steele, G.A. (author), Grove-Rasmussen, K. (author), Nygard, J. (author), Flensberg, K. (author), Kouwenhoven, L.P. (author)

Carbon nanotubes are a versatile material in which many aspects of condensed matter physics come together. Recent discoveries have uncovered new phenomena that completely change our understanding of transport in these devices, especially the role of the spin and valley degrees of freedom. This review describes the modern understanding of...

journal article 2015

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Electric and Magnetic Tuning Between the Trivial and Topological Phases in InAs/GaSb Double Quantum Wells

Qu, F. (author), Beukman, A.J.A. (author), Nadj-Perge, S. (author), Wimmer, M.T. (author), Nguyen, B.M. (author), Yi, W. (author), Thorp, J. (author), Sokolich, M. (author), Kiselev, A.A. (author), Manfra, M.J. (author), Marcus, C.M. (author), Kouwenhoven, L.P. (author)

Among the theoretically predicted two-dimensional topological insulators, InAs/GaSb double quantum wells (DQWs) have a unique double-layered structure with electron and hole gases separated in two layers, which enables tuning of the band alignment via electric and magnetic fields. However, the rich trivial-topological phase diagram has yet to be...

journal article 2015