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Band structure reconstruction across nematic order in high quality FeSe single crystal as revealed by optical spectroscopy study

  • Article
  • Physics & Astronomy
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Science Bulletin

Abstract

We perform an in-plane optical spectroscopy measurement on high quality FeSe single crystals grown by a vapor transport technique. Below the structural transition at \(T_{{\mathrm{s}}}\,{\sim }90\hbox { K}\), the reflectivity spectrum clearly shows a gradual suppression around \(400\hbox { cm}^{-1}\) and the conductivity spectrum shows a peak at higher frequency. The energy scale of this gap-like feature is comparable to the width of the band splitting observed by ARPES. The low-frequency conductivity consists of two Drude components and the overall plasma frequency is smaller than that of the FeAs based compounds, suggesting a lower carrier density or stronger correlation effect. The plasma frequency becomes even smaller below \(T_{\mathrm{s}}\) which agrees with the very small Fermi energy estimated by other experiments. Similar to iron pnictides, a clear temperature-induced spectral weight transfer is observed for FeSe, being indicative of strong correlation effect.

摘要

我们对用气相输运方法生长的高质量FeSe单晶样品进行了红外光谱的研究。在低温下的电子向列相中反射率谱在\(400\hbox { cm}^{-1}\) 附近受到明显压制, 同时电导率谱在较高能量位置出现了一个峰, 这表明低温下存在能带重构的现象。通过Drude-Lorentz拟合得到电导率上峰的中心位置约为65 meV, 这一能量和ARPES观察到的3d轨道能带劈裂的能量尺度相当。FeSe的低频电导率谱包含一个尖锐的和一个较宽的Drude峰, 其总的等离子体频率比其他的铁基超导体要小一些, 并且在电子向列相中进一步减小。这和其他实验中观察到低温下非常低的费米能一致。与其他FeAs超导体类似, FeSe的光电导率谱上有明显的谱重随着温度降低向高能转移的现象, 说明在FeSe中存在着很强的电子关联效应。

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (11120101003, 11327806), and the National Basic Research Program of China (2012CB821403).

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Authors and Affiliations

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Haipeng Wang

  2. International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China

    Zirong Ye, Yan Zhang & Nanlin Wang

  3. Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China

    Yan Zhang & Nanlin Wang

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  1. Haipeng Wang
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  2. Zirong Ye
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  3. Yan Zhang
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Correspondence to Nanlin Wang.

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Wang, H., Ye, Z., Zhang, Y. et al. Band structure reconstruction across nematic order in high quality FeSe single crystal as revealed by optical spectroscopy study. Sci. Bull. 61, 1126–1131 (2016). https://doi.org/10.1007/s11434-016-1102-2

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  • DOI: https://doi.org/10.1007/s11434-016-1102-2

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