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arXiv 1302.0187cond-mat.str-el
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Na2IrO3中的隐准粒子和非相干光电子能谱

Hidden Quasiparticles and Incoherent Photoemission Spectra in Na2IrO3

Fabien Trousselet, Mona Berciu, Andrzej M. Oles, Peter Horsch

摘要:

我们研究了蜂窝晶格上的两种Heisenberg-Kitaev类t-J模型,重点研究了Na $_2$ IrO $_3$的Z形磁相,并利用精确对角化和变分方法研究了空穴的运动.谱函数与铜酸盐的谱函数有很大的不同,并且在高能量下由大的非相干谱权重主导,几乎不依赖于微观参数-锯齿形磁关联的普遍和通用特征。我们解释了为什么在低能量的准粒子强烈抑制的光电能谱,并确定一个模拟的赝能隙。我们指出,在两种不同的模型内获得的锯齿形相位的主要非相干光谱的定性特征是相似的,它们具有显着的相似性最近报道的角分辨光电子能谱的Na $_2$ IrO $_3$。

英文摘要:

We study two Heisenberg-Kitaev t-J-like models on a honeycomb lattice, focusing on the zigzag magnetic phase of Na$_2$IrO$_3$, and investigate hole motion by exact diagonalization and variational methods. The spectral functions are quite distinct from those of cuprates and are dominated by large incoherent spectral weight at high energy, almost independent of the microscopic parameters --- a universal and generic feature for zigzag magnetic correlations. We explain why quasiparticles at low energy are strongly suppressed in the photoemission spectra and determine an analog of a pseudogap. We point out that the qualitative features of the predominantly incoherent spectra obtained within the two different models for the zigzag phase are similar, and they have remarkable similarity to recently reported angular resolved photoemission spectra for Na$_2$IrO$_3$.

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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