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@ARTICLE{Orenstein:631494,
      author       = {Orenstein, Gal and Krapivin, Viktor and Huang, Yijing and
                      Zhang, Zhuquan and de la Peña Muñoz, Gilberto and Duncan,
                      Ryan A. and Nguyen, Quynh and Stanton, Jade and Teitelbaum,
                      Samuel and Yavas, Hasan and Sato, Takahiro and Hoffmann,
                      Matthias C. and Kramer, Patrick and Zhang, Jiahao and
                      Cavalleri, Andrea and Comin, Riccardo and Dean, Mark P. M.
                      and Disa, Ankit S. and Först, Michael and Johnson, Steven
                      L. and Mitrano, Matteo and Rappe, Andrew M. and Reis, David
                      A. and Zhu, Diling and Nelson, Keith A. and Trigo, Mariano},
      title        = {{O}bservation of polarization density waves in
                      {S}r{T}i{O}$_3$},
      journal      = {Nature physics},
      volume       = {21},
      number       = {6},
      issn         = {1745-2473},
      address      = {Basingstoke},
      publisher    = {Nature Publishing Group},
      reportid     = {PUBDB-2025-02006},
      pages        = {961 - 965},
      year         = {2025},
      note         = {Waiting for fulltext},
      abstract     = {The nature of the incipient ferroelectric transition in
                      SrTiO$_3$ has been a long-standing puzzle in condensed
                      matter physics. One explanation involves the competition
                      between ferroelectricity and an instability characterized by
                      the mesoscopic modulation of the polarization. These
                      polarization density waves, which should intensify near the
                      quantum critical point, break local inversion symmetry and
                      are difficult to characterize with conventional X-ray
                      scattering methods. Here we probe inversion symmetry
                      breaking at finite momenta and visualize the instability of
                      the polarization at the nanometre scale in SrTiO$_3$ by
                      combining a femtosecond X-ray free-electron laser with
                      terahertz coherent control methods. We found polar-acoustic
                      collective modes that are soft, particularly at the tens of
                      nanometre scale. These precursor collective excitations
                      provide evidence for the conjectured mesoscopic-modulated
                      phase in SrTiO$_3$.},
      cin          = {DOOR ; HAS-User / Eur.XFEL / MPSD},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      $I:(DE-H253)Eur_XFEL-20120731$ / I:(DE-H253)MPSD-20120731},
      pnm          = {6G13 - Accelerator of European XFEL (POF4-6G13)},
      pid          = {G:(DE-HGF)POF4-6G13},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1038/s41567-025-02874-0},
      url          = {https://bib-pubdb1.desy.de/record/631494},
}