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Identifying the dominant pairing interaction in high-T_c FeSe superconductors through Leggett modes

机译：通过Leggett模式确定高T_c FeSe超导体中的主要配对相互作用

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摘要

Heavily electron-doped and single-layer FeSe superconduct at much higher temperatures than bulk FeSe. There have been a number of proposals attempting to explain the origin of the enhanced transition temperature, including the proximity to magnetic, nematic, and antiferro-orbital critical points, as well as possible strong interfacial phonon coupling in the case of single-layer FeSe. In this paper, we examine the effect of the various mechanisms in an effective two-band model. Within our model, the fluctuations associated with these instabilities contribute to different parts of the effective multiband interactions. We propose to use the collective phase fluctuation between the bands-the Leggett mode-as a tool to identify the dominant effective pairing interaction in these systems. The Leggett mode can be resolved by means of optical probes such as electronic Raman scattering. We point out that the Leggett mode in these systems, if present, shall manifest in the Raman B_(lg) channel.
机译：重电子掺杂和单层FeSe超导体的温度要比块状FeSe高得多。有许多建议试图解释转变温度升高的原因，包括接近磁性，向列和反铁轨道临界点，以及在单层FeSe情况下可能的强界面声子耦合。在本文中，我们研究了有效的两波段模型中各种机制的影响。在我们的模型中，与这些不稳定性相关的波动会影响有效多频段交互的不同部分。我们建议使用频带之间的集体相位波动（Leggett模式）作为一种工具来识别这些系统中的主要有效配对相互作用。可以通过光学探针（例如电子拉曼散射）解析Leggett模式。我们指出，这些系统中的Leggett模式（如果存在）将在拉曼B_（lg）通道中显示。

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  • 来源
    《Physical review》 |2018年第14期|687-694|共8页
  • 作者

    Wen Huang; Manfred Sigrist; Zheng-Yu Weng;

  • 作者单位

    Institute for Advanced Study, Tsinghua University, Beijing, 100084, China;

    Institut für Theoretische Physik, ETH-Zurich, CH-8093 Zurich, Switzerland;

    Institute for Advanced Study, Tsinghua University, Beijing, 100084, China,Collaborative Innovation Center of Quantum Matter, Tsinghua University, Beijing, 100084, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    144507.1-144507.8;

    机译：144507.1-144507.8;

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