70 citations · 168 across the 7 of their papers we have counts for
7 papers
Method for finding the critical temperature of the island in a SET structure
J. J. Toppari, T. Kühn, A. P. Halvari +1
We present a method to measure the critical temperature of the island of a superconducting single electron transistor. The method is based on a sharp change in the slope of the zer…
Turnstile behaviour of the Cooper-pair pump
J. J. Toppari, J. M. Kivioja, J. P. Pekola +1
We have experimentally studied the behaviour of the so-called Cooper pair pump (CPP) with three Josephson junctions, in the limit of small Josephson coupling EJ < EC. These experim…
Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor
J. J. Toppari, T. Kuhn, A. P. Halvari +3
We have fabricated and measured superconducting single-electron transistors with Al leads and Nb islands. At bias voltages below the gap of Nb we observe clear signatures of resona…
Connecting Berry's phase and the pumped charge in a Cooper pair pump
M. Aunola, J. J. Toppari
The properties of the tunnelling-charging Hamiltonian of a Cooper pair pump are well understood in the regime of weak and intermediate Josephson coupling, i.e. when $E_{\mathrm{J}}…
Decoherence in circuits of small Josephson junctions
J. P. Pekola, J. J. Toppari
We discuss dephasing by the dissipative electromagnetic environment and by measurement in circuits consisting of small Josephson junctions. We present quantitative estimates and de…
Arrays of Josephson junctions in an environment with vanishing impedance
M. Aunola, J. J. Toppari, J. P. Pekola
The Hamiltonian operator for an unbiased array of Josephson junctions with gate voltages is constructed when only Cooper pair tunnelling and charging effects are taken into account…