Scholarlink

<p>Antiferromagnetic insulators present a promising alternative to ferromagnets due to their ultrafast spin dynamics essential for low-energy terahertz spintronic device applications. Magnons, i.e., quantized spin waves capable of transmitting information through excitations, serve as a key functional element in this paradigm. However, identifying external mechanisms to effectively tune magnon properties has remained a major challenge. Here we demonstrate that interfacial metal-insulator transitions offer an effective method for controlling the magnons of Sr<sub>2</sub>IrO<sub>4</sub>, a strongly spin-orbit coupled antiferromagnetic Mott insulator. Resonant inelastic x-ray scattering experiments reveal a significant softening of zone-boundary magnon energies in Sr<sub>2</sub>IrO<sub>4</sub> films epitaxially interfaced with metallic 4<i>d</i> transition-metal oxides. Therefore, the magnon dispersion of Sr<sub>2</sub>IrO<sub>4</sub> can be tuned by metal-insulator transitions of the 4<i>d</i> transition-metal oxides. We tentatively attribute this non-trivial behavior to a long-range phenomenon mediated by magnon-acoustic phonon interactions. Our experimental findings introduce a strategy for controlling magnons and underscore the need for further theoretical studies to better understand the underlying microscopic interactions between magnons and phonons.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Tunable magnons of an antiferromagnetic Mott insulator via interfacial metal-insulator transitions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月15日

查看全文
  • Sujan Shrestha,
  • Maryam Souri,
  • Christopher J. Dietl,
  • Ekaterina M. Pärschke,
  • Maximilian Krautloher,
  • Gabriel A. Calderon Ortiz,
  • Matteo Minola,
  • Xiatong Shi,
  • Alexander V. Boris,
  • Jinwoo Hwang,
  • Giniyat Khaliullin,
  • Gang Cao,
  • Bernhard Keimer,
  • Jong-Woo Kim,
  • Jungho Kim,
  • Ambrose Seo

摘要

Antiferromagnetic insulators present a promising alternative to ferromagnets due to their ultrafast spin dynamics essential for low-energy terahertz spintronic device applications. Magnons, i.e., quantized spin waves capable of transmitting information through excitations, serve as a key functional element in this paradigm. However, identifying external mechanisms to effectively tune magnon properties has remained a major challenge. Here we demonstrate that interfacial metal-insulator transitions offer an effective method for controlling the magnons of Sr2IrO4, a strongly spin-orbit coupled antiferromagnetic Mott insulator. Resonant inelastic x-ray scattering experiments reveal a significant softening of zone-boundary magnon energies in Sr2IrO4 films epitaxially interfaced with metallic 4d transition-metal oxides. Therefore, the magnon dispersion of Sr2IrO4 can be tuned by metal-insulator transitions of the 4d transition-metal oxides. We tentatively attribute this non-trivial behavior to a long-range phenomenon mediated by magnon-acoustic phonon interactions. Our experimental findings introduce a strategy for controlling magnons and underscore the need for further theoretical studies to better understand the underlying microscopic interactions between magnons and phonons.