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@ARTICLE{Wang:1018651,
      author       = {Wang, Xiao and Zhu, Fengfeng and Yang, Xiuxian and Meven,
                      Martin and Mi, Xinrun and Yi, Changjiang and Song, Junda and
                      Mueller, Thomas and Schmidt, Wolfgang and Schmalzl, Karin
                      and Ressouche, Eric and Xu, Jianhui and He, Mingquan and
                      Shi, Youguo and Feng, Wanxiang and Mokrousov, Yuriy and
                      Blügel, Stefan and Roth, Georg and Su, Yixi},
      title        = {{F}lat band-engineered spin-density wave and the emergent
                      multi-$k$ magnetic state in the topological kagome metal
                      {M}n$_{3}${S}n},
      publisher    = {arXiv},
      reportid     = {FZJ-2023-04954},
      year         = {2023},
      abstract     = {Magnetic kagome metals, in which topologically non-trivial
                      band structures and electronic correlation are intertwined,
                      have recently emerged as an exciting platform to explore
                      exotic correlated topological phases, that are usually not
                      found in weakly interacting materials described within the
                      semi-classical picture of electrons. Here, via a
                      comprehensive single-crystal neutron diffraction and
                      first-principles density functional theory study of the
                      archetypical topological kagome metal Mn$_3$Sn, which is
                      also a magnetic Weyl fermion material and a promising chiral
                      magnet for antiferromagnetic spintronics, we report the
                      realisation of an emergent spin-density wave (SDW) order, a
                      hallmark correlated many-body phenomenon, that is engineered
                      by the Fermi surface nesting of topological flat bands. We
                      further reveal that the phase transition, from the
                      well-known high-temperature coplanar and non-collinear k = 0
                      inverse triangular antiferromagnetic order to a double-$k$
                      non-coplanar modulated incommensurate magnetic structure
                      below $T_1$ = 280 K, is primarily driven by the SDW
                      instability. The double-$k$ nature of this complex
                      low-temperature magnetic order, which can be regarded as an
                      intriguing superposition of a longitudinal SDW with a
                      modulation wavevector k$_L$ and a transverse incommensurate
                      helical magnetic order with a modulation wavevector k$_T$,
                      is unambiguously confirmed by our observation of the
                      inter-modulation high-order harmonics of the type of
                      2k$_L$+k$_T$. This discovery not only solves a long-standing
                      puzzle concerning the nature of the phase transition at
                      $T_1$, but also provides an extraordinary example on the
                      intrinsic engineering of correlated many-body phenomena in
                      topological matter. The identified multi-$k$ magnetic state
                      can be further exploited for the engineering of the new
                      modes of magnetization and chirality switching in
                      antiferromagnetic spintronics.},
      keywords     = {Strongly Correlated Electrons (cond-mat.str-el) (Other) /
                      Materials Science (cond-mat.mtrl-sci) (Other) /
                      Superconductivity (cond-mat.supr-con) (Other) / FOS:
                      Physical sciences (Other)},
      cin          = {JCNS-FRM-II / JCNS-2 / JCNS-ILL / MLZ / PGI-1 / IAS-1 /
                      JARA-FIT / JARA-HPC},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)JCNS-ILL-20110128
                      / I:(DE-588b)4597118-3 / I:(DE-Juel1)PGI-1-20110106 /
                      I:(DE-Juel1)IAS-1-20090406 / $I:(DE-82)080009_20140620$ /
                      $I:(DE-82)080012_20140620$},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632) / 5211 - Topological Matter
                      (POF4-521)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632 /
                      G:(DE-HGF)POF4-5211},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101 / EXP:(DE-MLZ)DNS-20140101 /
                      EXP:(DE-Juel1)ILL-IN12-20150421},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.48550/ARXIV.2306.04312},
      url          = {https://juser.fz-juelich.de/record/1018651},
}