Landau-Level Quantization and Band Splitting of FeSe Monolayers Revealed by Scanning Tunneling Spectroscopy.

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-11-18 DOI:10.1021/acs.nanolett.4c04461

Wantong Huang, Haicheng Lin, Yuguo Yin, Cheng Zheng, Wei Chen, Lichen Ji, Jack Hughes, Fedor Kusmartsev, Anna Kusmartseva, Qi-Kun Xue, Xi Chen, Shuai-Hua Ji

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Abstract

Two-dimensional (2D) superconductors that reside on substrates must be influenced by Rashba spin-orbit coupling (SOC). The intriguing effect of Rashba-type SOCs on iron-based superconductors (IBSs) has remained largely a mystery. In this work, we unveil modified Landau-level spectroscopy and the intricate band splitting of FeSe monolayers through the precision of scanning tunneling spectroscopy, which unequivocally demonstrates the presence of Rashba SOC. The discovery sheds light on a nonparabolic electron band at the X and/orY point, displaying a distinctive Landau quantization behavior characterized by E_n ∝ (nB)^4/3. The theoretical model aligns with our experimental insights, positing that the k⁴-term of the electron band becomes predominant and profoundly reshapes the band structure. Our results underscore the pivotal role of the Rashba SOC effect on 2D superconductors and set the stage to probe new quantum states in systems with remarkably low carrier concentrations.

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扫描隧道光谱法揭示的 FeSe 单层朗道级量子化和带分裂。

位于基底上的二维（2D）超导体必须受到拉什巴自旋轨道耦合（SOC）的影响。拉什巴自旋轨道耦合（SOC）对铁基超导体（IBS）的奇妙影响在很大程度上仍是一个谜。在这项工作中，我们通过精确的扫描隧道光谱揭示了改良的朗道级光谱和 FeSe 单层错综复杂的能带分裂，明确证明了拉什巴 SOC 的存在。这一发现揭示了在 X 点和/或 Y 点的非抛物线电子带，显示出独特的朗道量子化行为，其特征为 En ∝ (nB)4/3。理论模型与我们的实验结果一致，认为电子带的 k4 项变得占主导地位，并深刻地重塑了电子带结构。我们的研究结果强调了拉什巴 SOC 效应在二维超导体中的关键作用，并为在载流子浓度极低的系统中探索新的量子态奠定了基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.