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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Instanton Paths and Coherent Quantum Tunneling in Antiferromagnetic Spin Clusters Subject to a Strong Magnetic Field
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Instanton Paths and Coherent Quantum Tunneling in Antiferromagnetic Spin Clusters Subject to a Strong Magnetic Field

机译：强磁场作用下反铁磁自旋簇的瞬时路径和相干量子隧穿

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摘要

The coherent quantum tunneling effects in antiferromagnets in the presence of a strong external magnetic field parallel to the easy axis have been investigated using the instanton formalism. In a wide field range including the region of the phase spin-flop transition, the tunneling is described by 180 degrees instantons for which the Euclidean action is real and destructive interference is absent. At the transition point, 90 degrees instantons describing the tunneling between the collinear and spin-flop states appear. The Euclidean action decreases, whereas the tunneling probability and tunneling level splitting in both phases increase significantly in the immediate vicinity of the spin-flop transition point. The possibility of observing the coherent tunneling effects for artificial small particles (magnetic dots) made of antiferromagnets is discussed.
机译：使用瞬时子形式主义研究了在平行于易轴的强外部磁场存在下反铁磁体中的相干量子隧穿效应。在包括相位自旋跃迁过渡的区域的宽视场范围内，隧穿用180度实例描述，其欧几里德作用是真实的，并且没有破坏性干扰。在过渡点处，出现描述共线和自旋状态之间隧穿的90度瞬间。欧几里得作用减小，而在两个相中的隧穿概率和隧穿能级分裂在自旋触发器转变点的紧邻处显着增加。讨论了观察由反铁磁体制成的人造小颗粒（磁性点）的相干隧道效应的可能性。

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