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arXiv 1609.01650cond-mat.str-elcond-mat.stat-mech
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二维和三维kagome系统中的竞争磁序和自旋液体:伪费米子泛函重整化群观点

Competing magnetic orders and spin liquids in two- and three-dimensional kagome systems: A pseudo-fermion functional renormalization group perspective

Finn Lasse Buessen, Simon Trebst

摘要:

在二维和三维空间中,kagome晶格几何结构上的量子磁体是自旋系统的典型例子,在这些自旋系统中,几何挫折抑制了传统的磁有序,反而有利于低温下长距离纠缠自旋液体的出现。本文采用最近发展起来的赝费米子泛函重整化群(pf-FRG)方法研究了交换作用超过最近邻耦合的kagome和hyperkagome自旋系统的低温量子磁性.我们发现,次近邻耦合稳定的各种磁秩序,以及诱导额外的自旋液体制度,产生相当丰富的相图,我们的详细特征。在技术层面上,我们发现,PF-FRG的方法是在良好的定量协议与高温级数展开在其有效性范围内,它表现出系统的有限尺寸收敛的温度制度以下。我们讨论了显着的优势和目前的一些限制PF-FRG方法在正在进行的搜索非常规形式的量子磁性。

英文摘要:

Quantum magnets on kagome lattice geometries in two and three spatial dimensions are archetypal examples of spin systems in which geometric frustration inhibits conventional magnetic ordering and instead benefits the emergence of long-range entangled spin liquids at low temperature. Here we employ a recently developed pseudo-fermion functional renormalization group (pf-FRG) approach to study the low-temperature quantum magnetism of kagome and hyperkagome spin systems with exchange interactions beyond the nearest neighbor coupling. We find that next-nearest neighbor couplings stabilize a variety of magnetic orders as well as induce additional spin liquid regimes giving rise to rather rich phase diagrams, which we characterize in detail. On a technical level, we find that the pf-FRG approach is in excellent quantitative agreement with high-temperature series expansions over their range of validity and it exhibits a systematic finite-size convergence in the temperature regime below. We discuss notable advantages and some current limitations of the pf-FRG approach in the ongoing search for unconventional forms of quantum magnetism.

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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