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<p>Band degeneracy-driven topological phases in condensed matter physics have paved the way for a distinct type of Weyl systems. Ongoing research delves into quasi-particles beyond Dirac and Weyl semimetals, investigating their interactions and necessitating the discovery of new quantum materials. Furthermore, the coexistence of Type-I and II Weyl crossings in magnetic Weyl systems, protected by nonsymmorphic crystalline symmetry, represents a rare and intriguing combination. Our study focuses on the experimentally synthesized non-centrosymmetric chalcopyrite MnGeAs<sub>2</sub>, characterized by broken time-reversal symmetry. Notably, the Type-I and -II gapless Weyl nodal line co-occur in this material, and they exhibit resilience against the strong spin-orbit coupling (SOC) protected by the nonsymmorphic <i>d</i>-glide mirror symmetry. Moreover, the calculated Berry curvature-driven anomalous Hall conductivity (AHC) attains a substantial value of approximately 300 S/cm near the Type-I Weyl nodal line at 26 meV below the E<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_18272_Article_IEq4.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="11" /> </InlineMediaObject> <EquationSource Format="TEX">\(_f\)</EquationSource> </InlineEquation>. Further, the AHC gets enhanced to 350 S/cm for the mimicked thin film variant of the MnGeAs<InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_18272_Article_IEq5.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation>. This study provides insights into the relatively less-explored Weyl nodal line semimetals robust against the strong SOC.</p>

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Nonsymmorphic symmetry enforced Weyl nodal metal in chalcopyrite MnGeAs2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月6日

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  • Surasree Sadhukhan,
  • Sudipta Kanungo

摘要

Band degeneracy-driven topological phases in condensed matter physics have paved the way for a distinct type of Weyl systems. Ongoing research delves into quasi-particles beyond Dirac and Weyl semimetals, investigating their interactions and necessitating the discovery of new quantum materials. Furthermore, the coexistence of Type-I and II Weyl crossings in magnetic Weyl systems, protected by nonsymmorphic crystalline symmetry, represents a rare and intriguing combination. Our study focuses on the experimentally synthesized non-centrosymmetric chalcopyrite MnGeAs2, characterized by broken time-reversal symmetry. Notably, the Type-I and -II gapless Weyl nodal line co-occur in this material, and they exhibit resilience against the strong spin-orbit coupling (SOC) protected by the nonsymmorphic d-glide mirror symmetry. Moreover, the calculated Berry curvature-driven anomalous Hall conductivity (AHC) attains a substantial value of approximately 300 S/cm near the Type-I Weyl nodal line at 26 meV below the E \(_f\) . Further, the AHC gets enhanced to 350 S/cm for the mimicked thin film variant of the MnGeAs \(_2\) . This study provides insights into the relatively less-explored Weyl nodal line semimetals robust against the strong SOC.