Scholarlink

<p>The broken inversion symmetry in monolayer transition metal dichalcogenides (TMDs) permits light of specific helicities to address valley-polarized excitonic states, which could serve as inherent information carriers. Achieving large valley energy splitting and long valley lifetimes at room temperature is essential for practical valleytronic applications, yet remains challenging due to strong intervalley interactions. To tackle this, we coupled a single chiral plasmonic nano-resonator with monolayer MoS<sub>2</sub> to prolong the latter’s valley polarization through chiral plasmon-valley exciton selective coupling. Our findings show that the selective coupling significantly prolongs the valley exciton population contrast lifetime in the coupled MoS<sub>2</sub>, originating from valley energy splitting induced by the selective coupling that breaks the energy degeneracy between the valleys. The experimental results are further corroborated by an effective model, revealing distinct coupling strengths for the K and <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({{{{\rm{K}}}}}^{{\prime} }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="normal">K</mi> </mrow> <mrow> <mo>′</mo> </mrow> </msup> </math></EquationSource> </InlineEquation> valleys and a strong relation between plasmon-exciton energy detuning and valley polarization. This work offers new possibilities for information encoding and storage by exploiting the valley degree of freedom in cavity-coupled low-dimensional semiconductors.</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

Extended valley lifetime and giant energy splitting induced by chiral plasmon-valley exciton selective coupling

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月13日

查看全文
  • Jiahe Liu,
  • Feihong Liu,
  • Tingyang Xing,
  • Yifan Wang,
  • Zhiwei Peng,
  • Liang Guo,
  • Chen Hu,
  • Wang Yao,
  • Xiang Zhang,
  • Dangyuan Lei

摘要

The broken inversion symmetry in monolayer transition metal dichalcogenides (TMDs) permits light of specific helicities to address valley-polarized excitonic states, which could serve as inherent information carriers. Achieving large valley energy splitting and long valley lifetimes at room temperature is essential for practical valleytronic applications, yet remains challenging due to strong intervalley interactions. To tackle this, we coupled a single chiral plasmonic nano-resonator with monolayer MoS2 to prolong the latter’s valley polarization through chiral plasmon-valley exciton selective coupling. Our findings show that the selective coupling significantly prolongs the valley exciton population contrast lifetime in the coupled MoS2, originating from valley energy splitting induced by the selective coupling that breaks the energy degeneracy between the valleys. The experimental results are further corroborated by an effective model, revealing distinct coupling strengths for the K and \({{{{\rm{K}}}}}^{{\prime} }\) K ′ valleys and a strong relation between plasmon-exciton energy detuning and valley polarization. This work offers new possibilities for information encoding and storage by exploiting the valley degree of freedom in cavity-coupled low-dimensional semiconductors.