Quantum Switching by Making Use of Adiabatic Changes: Landau–Zener–Stückelberg Mechanism and Rosen–Zener Mechanism
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概要
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A mechanism of switching between states of different magnetizations without hysteresis loss is proposed in quantum magnets. We use quantum mechanical dynamics at the avoided level crossing structure. There, the Landau–Zener–Stückelberg mechanism for the nonadiabatic transition plays an important role in changing quantum state. We demonstrate this mechanism in a Heisenberg spin model forming a dimer state, where the singlet and triplet states are switched to each other by applying a time-dependent external field. We also study the switching mechanism by rotating the direction of the field to control the gap due to the anisotropy of the Dzyaloshinskii–Moriya interaction.
- 2004-01-15
著者
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Miyashita Seiji
Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo
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Miyashita Seiji
Department of Applied Physics Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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