Anomalous Nodal Gap in a Doped Spin-1/2 Antiferromagnetic Mott Insulator
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909892935155712 |
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| author | Hu, Yong Lane, Christopher Chen, Xiang Peng, Shuting Sun, Zeliang Hashimoto, Makoto Lu, Donghui Wu, Tao Markiewicz, Robert S. Chen, Xianhui Bansil, Arun Wilson, Stephen D. He, Junfeng |
| author_facet | Hu, Yong Lane, Christopher Chen, Xiang Peng, Shuting Sun, Zeliang Hashimoto, Makoto Lu, Donghui Wu, Tao Markiewicz, Robert S. Chen, Xianhui Bansil, Arun Wilson, Stephen D. He, Junfeng |
| contents | Many emergent phenomena appear in doped Mott insulators near the insulator-to-metal transition. In high-temperature cuprate superconductors, superconductivity arises when antiferromagnetic (AFM) order is gradually suppressed by carrier doping, and a $\textit{d}$-wave superconducting gap forms when an enigmatic nodal gap evolves into a point node. Here, we examine electron-doped Sr$_{2}$IrO$_{4}$, the 5$\textit{d}$-electron counterpart of cuprates, using angle-resolved photoemission spectroscopy. At low doping levels, we observe the formation of electronic states near the Fermi level, accompanied by a gap at the AFM zone boundary, mimicking the AFM gap in electron-doped cuprates. With increasing doping, a distinct gap emerges along the (0,0)-($π$,$π$) nodal direction, paralleling that observed in hole-doped cuprates. This anomalous nodal gap persists after the collapse of the AFM gap and gradually decreases with further doping. It eventually vanishes into a point node of the reported $\textit{d}$-wave gap. These observations replicate the characteristic features in both electron- and hole-doped cuprates, indicating a unified route toward nodal metallicity in doped spin-1/2 AFM Mott insulators. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_05390 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalous Nodal Gap in a Doped Spin-1/2 Antiferromagnetic Mott Insulator Hu, Yong Lane, Christopher Chen, Xiang Peng, Shuting Sun, Zeliang Hashimoto, Makoto Lu, Donghui Wu, Tao Markiewicz, Robert S. Chen, Xianhui Bansil, Arun Wilson, Stephen D. He, Junfeng Superconductivity Materials Science Strongly Correlated Electrons Many emergent phenomena appear in doped Mott insulators near the insulator-to-metal transition. In high-temperature cuprate superconductors, superconductivity arises when antiferromagnetic (AFM) order is gradually suppressed by carrier doping, and a $\textit{d}$-wave superconducting gap forms when an enigmatic nodal gap evolves into a point node. Here, we examine electron-doped Sr$_{2}$IrO$_{4}$, the 5$\textit{d}$-electron counterpart of cuprates, using angle-resolved photoemission spectroscopy. At low doping levels, we observe the formation of electronic states near the Fermi level, accompanied by a gap at the AFM zone boundary, mimicking the AFM gap in electron-doped cuprates. With increasing doping, a distinct gap emerges along the (0,0)-($π$,$π$) nodal direction, paralleling that observed in hole-doped cuprates. This anomalous nodal gap persists after the collapse of the AFM gap and gradually decreases with further doping. It eventually vanishes into a point node of the reported $\textit{d}$-wave gap. These observations replicate the characteristic features in both electron- and hole-doped cuprates, indicating a unified route toward nodal metallicity in doped spin-1/2 AFM Mott insulators. |
| title | Anomalous Nodal Gap in a Doped Spin-1/2 Antiferromagnetic Mott Insulator |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2511.05390 |