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

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• 作者：Haipeng Wang ; Zirong Ye ; Yan Zhang ; Nanlin Wang
• 刊名：Chinese Science Bulletin
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：61
• 期：14
• 页码：1126-1131
• 全文大小：1,205 KB
• 刊物主题：Science, general; Life Sciences, general; Physics, general; Chemistry/Food Science, general; Earth Sciences, general; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9541
• 卷排序：61

文摘

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.KeywordsIron-based superconductorOptical spectroscopyNematic phaseBand reconstruction