Eigenmodes in the long-time behavior of a coupled spin system measured with nuclear magnetic resonance.

Eigenmodes in the long-time behavior of a coupled spin system measured with nuclear magnetic resonance.
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用核磁共振测量耦合自旋系统长期行为的本征模

DOI:
10.1103/physrevlett.108.177602
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发表时间:
2012
影响因子:
8.6
通讯作者:
J. Haase
J. Haase
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
B. Meier;J. Kohlrautz;J. Haase

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本文用核磁共振方法研究了孤立立方晶格中偶极耦合核自旋的多体量子动力学。通过增加2个数量级的信噪比相比,以前的报告的自由感应衰减(FID)ofin,我们获得了新的见解,其长期的行为。我们确认FID的尾部是一个指数衰减的余弦,但我们的测量揭示了第二个衰减模式,具有可比的频率,但衰减常数的两倍。这一结果与最近的理论预测FID的混沌多体量子系统的时间演化的本征值。
The many-body quantum dynamics of dipolar coupled nuclear spinson an otherwise isolated cubic lattice are studied with nuclear magnetic resonance. By increasing the signal-to-noise ratio by 2 orders of magnitude compared with previous reports for the free induction decay (FID) ofinwe obtain new insight into its long-time behavior. We confirm that the tail of the FID is an exponentially decaying cosine, but our measurements reveal a second decay mode with comparable frequency but twice the decay constant. This result is in agreement with a recent theoretical prediction for the FID in terms of eigenvalues for the time evolution of chaotic many-body quantum systems.
核自旋的普遍长期行为在固体中衰变。
DOI: 10.1103/physrevlett.101.067601
发表时间: 2008
影响因子: 8.6
作者:
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