19 citations · 19 across the 3 of their papers we have counts for
7 papers
Electrons and holes in Si quantum well: a room-temperature transport and drag resistance study
M. Prunnila, S. J. Laakso, J. M. Kivioja +1
We investigate carrier transport in a single 22 nm-thick double-gated Si quantum well device, which has independent contacts to electrons and holes. Conductance, Hall density and H…
Double Gate Bias Dependency of Low Temperature Conductivity of SiO2-Si-SiO2 Quantum Wells
M. Prunnila, J. M. Kivioja, J. Ahopelto
The gate bias dependency of conductivity is examined in two Si quantum wells with well thickness tw = 7 nm and tw = 14 nm. The conductivity of the thinner device behaves smoothly w…
Energy Transport between Hole Gas and Crystal Lattice in Diluted Magnetic Semiconductor
J. M. Kivioja, M. Prunnila, S. Novikov +2
The temperature dependent energy transfer rate between charge carriers and lattice has been experimentally investigated in ferromagnetic semiconductors. Studied 100 nm thick low-te…
Shot-noise-driven escape in hysteretic Josephson junctions
J. P. Pekola, T. E. Nieminen, M. Meschke +3
We have measured the influence of shot noise on hysteretic Josephson junctions initially in macroscopic quantum tunnelling (MQT) regime. Escape threshold current into the resistive…
Observation of transition from escape dynamics to underdamped phase diffusion in a Josephson junction
J. M. Kivioja, T. E. Nieminen, J. Claudon +3
We have investigated the dynamics of underdamped Josephson junctions. In addition to the usual crossover between macroscopic quantum tunnelling and thermally activated (TA) behavio…
Evidence of Cooper pair pumping with combined flux and voltage control
Antti O. Niskanen, Jani M. Kivioja, H. Seppa +1
We have experimentally demonstrated pumping of Cooper pairs in a single-island mesoscopic structure. The island was connected to leads through SQUID (Superconducting Quantum Interf…