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11 papers · 2 filters
Spin torque and force due to current for general spin textures
Gen Tatara, Hiroshi Kohno, Junya Shibata +2
Non-adiabatic correction to spin transfer torque arising from fast-varying spin texture is calculated treating conduction electron fully quantum mechanically. The torque is non-loc…
Microscopic Calculation of Spin Torques and Forces
H. Kohno, G. Tatara, J. Shibata +1
Spin torques, that is, effects of conduction electrons on magnetization dynamics, are calculated microscopically in the first order in spatial gradient and time derivative of magne…
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…
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…
Full Counting Statistics of Interacting Electrons
D. A. Bagrets, Y. Utsumi, D. S. Golubev +1
In order to fully characterize the noise associated with electron transport, with its severe consequences for solid-state quantum information systems, the theory of full counting s…
Microscopic Calculation of Spin Torques in Disordered Ferromagnets
Hiroshi Kohno, Gen Tatara, Junya Shibata
Effects of conduction electrons on magnetization dynamics, represented by spin torques, are calculated microscopically in the first order in spatial gradient and time derivative of…