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9 papers · 1 filter
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…
Electron-Acoustic Phonon Energy Loss Rate in Multi-Component Electron Systems with Symmetric and Asymmetric Coupling Constants
Mika Prunnila
We consider electron-phonon (\textit{e-ph}) energy loss rate in 3D and 2D multi-component electron systems in semiconductors. We allow general asymmetry in the \textit{e-ph} coupli…
Spectroscopy of three strongly coupled flux qubits
A. O. Niskanen, K. Harrabi, F. Yoshihara +2
We have carried out spectroscopic measurements of a system of three strongly coupled four-junction flux qubits. The samples studied cover a wide range of parameters with the coupli…
High resolution superconducting single flux quantum comparator for sub kelvin temperatures
A. M. Savin, J. P. Pekola, T. Holmqvist +4
A design of subkelvin single flux quantum (SFQ) circuits with reduced power dissipation and additional cooling of shunt resistors for superconducting qubit control circuits has bee…
Decoherence of flux qubits due to 1/f flux noise
F. Yoshihara, K. Harrabi, A. O. Niskanen +2
We have investigated decoherence in Josephson-junction flux qubits. Based on the measurements of decoherence at various bias conditions, we discriminate contributions of different…