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Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger no-cloning theorem
Koji Azuma, Masato Koashi, Hosho Katsura +1
We investigate the cases where a set of states cannot be cloned by itself, but is clonable with the help of another system prepared in state . When $S…
Electron localization/delocalization in incommensurate helical magnets
Shu Tanaka, Hosho Katsura, Naoto Nagaosa
The electronic states in incommensurate (IC) helical magnets are studied theoretically from the viewpoint of the localization/delocalization. It is found that in the multi-band sys…
Dynamical magneto-electric coupling in helical magnets
Hosho Katsura, Alexander V. Balatsky, Naoto Nagaosa
Collective mode dynamics of the helical magnets coupled to electric polarization via spin-orbit interaction is studied theoretically. The soft modes associated with the ferroelectr…
Voltage dependence of Landau-Lifshitz-Gilbert damping of a spin in a current driven tunnel junction
Hosho Katsura, Alexander V. Balatsky, Zohar Nussinov +1
We present a theory of Landau-Lifshitz-Gilbert damping for a localized spin in the junction coupled to the conduction electrons in both leads under an applied volate…