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<p>Transition metal dichalcogenides and related layered materials in their monolayer and a few layers thicknesses regime provide a promising optoelectronic platform for exploring the excitonic- and many-body physics. Here, we have investigated the effects of nanoparticle-induced local strain on the optical properties of exciton, <i>X</i><sup>0</sup>, and trion, <i>X</i><sup>−</sup>, in monolayer WS<sub>2</sub>. Biaxial tensile strain up to 2.0% was quantified and verified by monitoring the changes in three prominent Raman modes of WS<sub>2</sub>: <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43246_2025_809_Article_IEq1.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\({{{{\rm{E}}}}}_{2g}^{1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mi mathvariant="normal">E</mi> </mrow> <mrow> <mn>2</mn> <mi>g</mi> </mrow> <mrow> <mn>1</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation>(Γ), A<sub>1<i>g</i></sub>, and 2LA(M). We obtained an increase of 34 meV in <i>X</i><sup>−</sup> binding energy with an average tuning rate of 17.5 ± 2.5 meV/% strain across all the samples irrespective of the surrounding dielectric environment of monolayer WS<sub>2</sub> and the sample preparation conditions. Strain-induced linewidth broadening and deformation potentials of both <i>X</i><sup>0</sup> and <i>X</i><sup>−</sup> emission elucidate that <i>X</i><sup>−</sup> binding energy increases due to strain-enhanced electron–phonon coupling. This work holds relevance for future <i>X</i><sup>−</sup>-based nano-opto-electro-mechanical systems and devices.</p>

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Large trion binding energy in monolayer WS2 via strain-enhanced electron–phonon coupling

  • 期刊论文

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  • 发表日期：

    2025年4月29日

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  • Yunus Waheed,
  • Sumitra Shit,
  • Jithin T. Surendran,
  • Indrajeet D. Prasad,
  • Kenji Watanabe,
  • Takashi Taniguchi,
  • Santosh Kumar

摘要

Transition metal dichalcogenides and related layered materials in their monolayer and a few layers thicknesses regime provide a promising optoelectronic platform for exploring the excitonic- and many-body physics. Here, we have investigated the effects of nanoparticle-induced local strain on the optical properties of exciton, X0, and trion, X−, in monolayer WS2. Biaxial tensile strain up to 2.0% was quantified and verified by monitoring the changes in three prominent Raman modes of WS2: \({{{{\rm{E}}}}}_{2g}^{1}\) E 2 g 1 (Γ), A1g, and 2LA(M). We obtained an increase of 34 meV in X− binding energy with an average tuning rate of 17.5 ± 2.5 meV/% strain across all the samples irrespective of the surrounding dielectric environment of monolayer WS2 and the sample preparation conditions. Strain-induced linewidth broadening and deformation potentials of both X0 and X− emission elucidate that X− binding energy increases due to strain-enhanced electron–phonon coupling. This work holds relevance for future X−-based nano-opto-electro-mechanical systems and devices.