J. J. A. Baselmans

Enhancement of quasiparticle recombination in Ta and Al superconductors by implantation of magnetic and nonmagnetic atoms (2008)

Barends, R., Van Vliet, S., Baselmans, J. J. A., Yates, S. J. C., Gao, J. R., Klapwijk, T. M.

The quasiparticle recombination time in superconducting films, consisting of the standard electron-phonon interaction and a yet to be identified low temperature process, is studied for different...

Contribution of dielectrics to frequency and noise of NbTiN superconducting resonators (2008)

Barends, R., Hortensius, H. L., Zijlstra, T., Baselmans, J. J. A., Yates, S. J. C., Gao, J. R., ...

We study NbTiN resonators by measurements of the temperature dependent resonance frequency and frequency noise. Additionally, resonators are studied covered with SiOx dielectric layers of various...

Quasiparticle relaxation in optically excited high-Q superconducting resonators (2008)

Barends, R., Baselmans, J. J. A., Yates, S. J. C., Gao, J. R., Hovenier, J. N., Klapwijk, T. M.

The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response of the complex conductivity to photon flux. For tantalum and aluminium,...

IF impedance and mixer gain of NbN hot electron bolometers (2007)

Kooi, J. W., Baselmans, J. J. A., Hajenius, M., Gao, J. R., Klapwijk, T. M., Dieleman, P., ...

The intermediate frequency (IF) characteristics, the frequency dependent IF impedance, and the mixer conversion gain of a small area hot electron bolometer (HEB) have been measured and modeled. The...

Full characterization and analysis of a terahertz heterodyne receiver based on a NbN hot electron bolometer (2006)

Hajenius, M., Baselmans, J. J. A., Baryshev, A., Gao, J. R., Klapwijk, T. M., Kooi, J. W., ...

We present a complete experimental characterization of a quasioptical twin-slot antenna coupled small area (1.0×0.15 µm^2) NbN hot electron bolometer (HEB) mixer compatible with currently available...

Stability of heterodyne terahertz receivers (2006)

Kooi, J. W., Baselmans, J. J. A., Baryshev, A., Schieder, R., Hajenius, M., Gao, J. R., ...

In this paper we discuss the stability of heterodyne terahertz receivers based on small volume NbN phonon cooled hot electron bolometers (HEBs). The stability of these receivers can be broken down in...

Reduced noise in NbN hot-electron bolometer mixers by annealing (2006)

Yang, Z.Q., Hajenius, M., Baselmans, J.J.A., Gao, J.R., Voronov, B., Gol'tsman, G.N.

Low noise NbN superconducting hot electron bolometer mixers at 1.9 and 2.5 THz (2004)

Hajenius, M., Baselmans, J.J.A., Gao, J.R., Klapwijk, T.M., Voronov, B., ...

Electrical detection of spin accumulation and spin precession at room temperature in metallic spin valves (2002)

Jedema, F.J., Costache, M.V., Heersche, H.B., Baselmans, J.J.A., Wees, B.J. Van

We have fabricated a multiterminal lateral mesoscopic metallic spin valve demonstrating spin precession at room temperature (RT), using tunnel barriers in combination with metallic ferromagnetic...

Electrical detection of spin precession in a metallic mesoscopic spin valve (2002)

Jedema, F.J., Heersche, H.B., Filip, A.T., Baselmans, J.J.A., Wees, B.J. Van

To study and control the behaviour of the spins of electrons that are moving through a metal or semiconductor is an outstanding challenge in the field of ‘spintronics’, where possibilities for...

Direct demonstration of circulating currents in a controllable π-SQUID generated by a 0 to π transition of the weak links (2002)

Baselmans, J.J.A., Wees, B.J. Van, Klapwijk, T.M.

A controllable π-SQUID is a DC SQUID (direct-current superconducting quantum interference device) with two controllable π junctions as weak links. A controllable π junction consists of a...

Direct Observation of the Transition from the Conventional Superconducting State to the π State in a Controllable Josephson Junction (2002)

Baselmans, J.J.A., Heikkilä, T.T., Wees, B.J. Van, Klapwijk, T.M.

We measure the full supercurrent-phase relation of a controllable π junction around the transition from the conventional 0 state to the π state. We show that around the transition the Josephson...

Controllable π SQUID (2001)

Baselmans, J.J.A., Wees, B.J. Van, Klapwijk, T.M.

We have fabricated and studied a promising kind of direct current superconducting quantum interference device (dc-SQUID) in which the magnitude and sign of the critical current of the individual...

Nonequilibrium supercurrent transport in controllable superconductor–normal-metal–superconductor junctions (2001)

Baselmans, J.J.A., Wees, B.J. Van, Klapwijk, T.M.

We study the supercurrent through a superconductor (Nb)–normal-metal (Ti-Au bilayer)–superconductor junction as a function of the electron distribution in the normal region. The normal region of...

Energy Spectroscopy of Josephson Supercurrent (2000)

Morpurgo, A.F., Baselmans, J.J.A., Wees, B.J. Van, Klapwijk, T.M.

In this paper we review recent microscopic studies of supercurrent flow in Josephson junctions. In particular, we discuss a method that allows direct measurements of the contribution given to the...

Reversing the direction of the supercurrent in a controllable Josephson junction (1999)

Baselmans, J.J.A., Morpurgo, A.F., Wees, B.J. Van, Klapwijk, T.M.

When two superconductors are connected by a weak link, a supercurrent flows, the magnitude of which is determined by the difference in the macroscopic quantum phases of the superconductors. This...

Tunable supercurrent in superconductor/normal metal/superconductor Josephson junctions (1999)

Baselmans, J.J.A., Morpurgo, A.F., Wees, B.J. Van, Klapwijk, T.M.

When two superconductors are connected by a weak link a supercurrent flows determined by the difference in the macroscopic quantum phases of the superconductors. Originally, this phenomenon was...