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arXiv 0809.0038cond-mat.str-el
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路径积分法研究关联在双量子点和光晶格自旋交换耦合中的作用

Path integral study of the role of correlation in exchange coupling of spins in double quantum dots and optical lattices

Lei Zhang, Matthew Gilbert, Jesper Pedersen, John Shumway

摘要:

我们探讨了双点和光晶格中自旋对的交换耦合。我们的算法使用的频率交换玻色子路径积分,评估与蒙特卡洛。该算法简单到可以作为一个“黑盒”计算器,但通过两粒子概率密度、瞬子的可视化和对关联函数,可以深入了解关联的作用。我们将问题映射到哈伯德模型,并看到交换和相关重新归一化的有效参数,显着降低U在较大的分离。

英文摘要:

We explore exchange coupling of a pair of spins in a double dot and in an optical lattice. Our algorithm uses the frequency of exchanges in a bosonic path integral, evaluated with Monte Carlo. This algorithm is simple enough to be a "black box" calculator, yet gives insights into the role of correlation through two-particle probability densities, visualization of instantons, and pair correlation functions. We map the problem to Hubbard model and see that exchange and correlation renormalize the effective parameters, dramatically lowering U at larger separations.

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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