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Nonadiabaticity in spin pumping under relaxation
Kazunari Hashimoto, Gen Tatara, Chikako Uchiyama
Using a minimum model consisting of a magnetic quantum dot and an electron lead, we investigate spin pumping by its precessing magnetization. Focusing on the "adiabaticity", which…
Dissipation Enhanced Asymmetric Transport in Quantum Ratchets
Gen Tatara, Macoto Kikuchi, Satoshi Yukawa +1
Quantum mechanical motion of a particle in a periodic asymmetric potential is studied theoretically at zero temperature. It is shown based on semi-classical approximation that the…
Quantum Ratchets
Satoshi Yukawa, Macoto Kikuchi, Gen Tatara +1
The concept of thermal ratchets is extended to the system governed by quantum mechanics. We study a tight-binding model with an asymmetric periodic potential contacting with a heat…