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arXiv 1609.01922cond-mat.str-el
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Shastry-Sutherland磁体中的拓扑三重子模和束缚态

Topological Triplon Modes and Bound States in a Shastry-Sutherland Magnet

P. A. McClarty, F. Krüger, T. Guidi, S. F. Parker, K. Refson, A. W. Parker, D. Prabakharan, R. Coldea

摘要:

20世纪80年代的量子霍尔效应和21世纪的拓扑带绝缘体的发现是物理学的里程碑,丰富了我们对固体电子性质的看法。简而言之,这些发现告诉我们,结晶固体中的量子力学波函数可能携带非平凡的拓扑不变量,这些不变量对可观察的物理学有影响。最近的拓扑绝缘体革命的一个副作用是,这种物理学比十年前所认识的要广泛得多。例如,虽然拓扑绝缘体最初是在电子波函数的背景下研究的,但最近的工作导致了在玻色子系统中的拓扑绝缘体的建议:在光子晶体中,在晶体的振动模式中,以及在有序磁体的激发中。在这里,我们证实了最近的建议,在弱磁场中,二聚量子磁体SrCu $_{2}$(BO $_{3}$)$_2$是一个玻色拓扑绝缘体的非零的三重子带的陈数和拓扑保护的手征边缘激发。

英文摘要:

The twin discoveries of the quantum Hall effect, in the 1980's, and of topological band insulators, in the 2000's, were landmarks in physics that enriched our view of the electronic properties of solids. In a nutshell, these discoveries have taught us that quantum mechanical wavefunctions in crystalline solids may carry nontrivial topological invariants which have ramifications for the observable physics. One of the side effects of the recent topological insulator revolution has been that such physics is much more widespread than was appreciated ten years ago. For example, while topological insulators were originally studied in the context of electron wavefunctions, recent work has led to proposals of topological insulators in bosonic systems: in photonic crystals, in the vibrational modes of crystals, and in the excitations of ordered magnets. Here we confirm the recent proposal that, in a weak magnetic field, the dimerized quantum magnet SrCu$_{2}$(BO$_{3}$)$_2$ is a bosonic topological insulator with nonzero Chern number in the triplon bands and topologically protected chiral edge excitations.

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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