Quantum Mechanical Transitions in a Dissipative Environment
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概要
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We have constructed an algorithm to treat quantum mechanical dynamics, such as the nonadiabatic transitions in a dissipative environment, by making use of the formula of reduced density matrix, i.e., Quantum Master Equation (QME). We applied the method to investigate dynamics of magnetization of nanoscale magnets, such as Mn_<12> and Fe_8, in a time dependent field. Due to the discreteness of the energy levels in small systems the resonating tunneling phenomena play an important role. At relatively high temperatures the excited levels contribute to the transition and the transition rate depends significantly on the temperature. On the other hand, at very low temperatures the magnetization process does not depend on the temperature. Even at such a low temperature, the effect of environments is still relevant. We demonstrate such a process with the method of QME. We also analyze temperature dependent phenomena of hysteresis of the nanoscale magnets.
- 理論物理学刊行会の論文
- 2000-04-28
著者
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MIYASHITA Seiji
Department of Applied Physics, Graduate School of Engineering, The University of Tokyo
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Raedt Hans
Institute For Theoretical Physics And Materials Science Centre University Of Groningen
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Miyashita S
Univ. Tokyo Tokyo Jpn
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Miyashita Seiji
Department Of Physics University Of Tokyo
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Miyashita Seiji
Graduate School Of Human And Environmental Studies Kyoto University
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MIYASHITA Seiji
Physics Applied Department, University of Tokyo
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SAITO Keiji
Physics Applied Department, University of Tokyo
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De Raedt
Institute For Theoretical Physics And Materials Science Centre
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Saito Keiji
Physics Applied Department University Of Tokyo
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Miyashita Seiji
Physics Applied Department University Of Tokyo
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Miyashita Seiji
Crest Jst
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MIYASHITA Seiji
Department of Applied Physics, University of Tokyo
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MIYASHITA Seiji
Department of Applied Physics, School of Engineering, University of Tokyo
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MIYASHITA Seiji
Department of Physics, School of Science, The University of Tokyo
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MIYASHITA Seiji
Faculty of Integrated Human Studies, Kyoto University
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