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arXiv 1304.7618quant-phcond-mat.mes-hall
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分子纳米磁体中线性叠加的尺寸

On the size of linear superpositions in molecular nanomagnets

Filippo Troiani, Paolo Zanardi

摘要:

分子纳米磁体是零维自旋系统,在低温下表现出量子力学行为。利用量子信息理论的措施,我们在这里量化的线性叠加的大小,可以在地面多重高,低自旋纳米磁体。在前一类体系中,我们主要关注Mn 12和Fe 8。进一步增加这种尺寸的一般标准也概述,并说明在自旋环的情况下。低自旋系统中线性叠加的实际特征(微观或宏观)本质上是不明确的。这里,这个问题是解决具体参考的Cr 7 Ni和V15分子,其特征在于S=1/2基态。在这两种情况下,我们得到的测量值都大于单个s=1/2自旋的测量值,但与组成自旋的数量和值不成比例。

英文摘要:

Molecular nanomagnets are zero-dimensional spin systems, that exhibit quantum mechanical behavior at low temperatures. Exploiting quantum-information theoretic measures, we quantify here the size of linear superpositions that can be generated within the ground multiplet of high- and low-spin nanomagnets. Amongst the former class of systems, we mainly focus on Mn12 and Fe8. General criteria for further increasing such sizes are also outlined, and illustrated in the case of spin rings. The actual character (micro or macroscopic) of linear superpositions in low-spin systems is inherently ill-defined. Here, this issue is addressed with specific reference to the Cr7Ni and V15 molecules, characterized by an S=1/2 ground state. In both cases, the measures we obtain are larger than those of a single s=1/2 spin, but not proportionate to the number and value of the constituent spins.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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