Scholarlink

<p>The nature of the dominant pairing mechanism in some two-dimensional transition metal dichalcogenides is still debated. Focusing on monolayer 1H-NbSe<sub>2</sub>, we show that superconductivity can be induced by the Coulomb interaction when accounting for screening effects on the trigonal lattice with multiple orbitals. Using ab initio based tight-binding parametrizations for the relevant low-energy <i>d</i>-bands, we evaluate the screened interaction microscopically. In the direct space, we find pronounced Friedel oscillations, a key to the Kohn-Luttinger mechanism for superconductivity. The momentum-resolved gap equations predict at the critical temperature <i>T</i><sub>c</sub> two degenerate solutions of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41467_2025_63319_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\({E}^{{\prime} }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi>E</mi> </mrow> <mrow> <mo>′</mo> </mrow> </msup> </math></EquationSource> </InlineEquation> symmetry, signalling the unconventional nature of the pairing. Their complex linear combination, i.e., a chiral gap with <i>p</i>-like symmetry, provides the ground state of the model. Our prediction of a fully gapped chiral phase well below <i>T</i><sub>c</sub> is in good agreement with the spectral function extracted from tunnelling spectroscopy measurements.</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

Friedel oscillations and chiral superconductivity in monolayer NbSe2

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月5日

查看全文
  • Julian Siegl,
  • Anton Bleibaum,
  • Wen Wan,
  • Marcin Kurpas,
  • John Schliemann,
  • Miguel M. Ugeda,
  • Magdalena Marganska,
  • Milena Grifoni

摘要

The nature of the dominant pairing mechanism in some two-dimensional transition metal dichalcogenides is still debated. Focusing on monolayer 1H-NbSe2, we show that superconductivity can be induced by the Coulomb interaction when accounting for screening effects on the trigonal lattice with multiple orbitals. Using ab initio based tight-binding parametrizations for the relevant low-energy d-bands, we evaluate the screened interaction microscopically. In the direct space, we find pronounced Friedel oscillations, a key to the Kohn-Luttinger mechanism for superconductivity. The momentum-resolved gap equations predict at the critical temperature Tc two degenerate solutions of \({E}^{{\prime} }\) E ′ symmetry, signalling the unconventional nature of the pairing. Their complex linear combination, i.e., a chiral gap with p-like symmetry, provides the ground state of the model. Our prediction of a fully gapped chiral phase well below Tc is in good agreement with the spectral function extracted from tunnelling spectroscopy measurements.