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@ARTICLE{Yachmenev:639388,
      author       = {Yachmenev, Andrey and Yang, Guang},
      title        = {{N}uclear spin symmetry breaking and spin polarization in
                      rotational energy level clusters},
      journal      = {Physical review research},
      volume       = {7},
      number       = {3},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {PUBDB-2025-04482},
      pages        = {L032047},
      year         = {2025},
      abstract     = {We present the first quantum mechanical study of hyperfine
                      effects in the rotational cluster states of a symmetric
                      triatomic molecule H$_2$⁡S. Rotational clusters arise from
                      spontaneous symmetry breaking induced by
                      high-angular-momentum rotational motions in certain rigid
                      molecules, resulting in dynamic enantiomorphism driven by
                      kinetic distortion effects. Hyperfine interactions in the
                      cluster states lead to collision-free breaking of nuclear
                      spin symmetry, with the magnitude of nuclear spin ortho-para
                      mixing significantly exceeding that in other states with
                      same or lower angular momentum. The ortho-para mixing
                      induces nuclear spin polarization in the laboratory frame
                      and gives rise to two sets of enantiomers, which have
                      different energies and oppositely oriented nuclear spin
                      projections. Although hyperfine interactions preserve
                      parity, they lift the degeneracy of opposite-parity cluster
                      states. This phenomenon, previously observed experimentally,
                      is explained as a result of tunneling between rotating
                      enantiomers, facilitated by the Pauli exclusion principle.},
      cin          = {FS-CFEL-CMI},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-CFEL-CMI-20220405},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/k7nd-nnxg},
      url          = {https://bib-pubdb1.desy.de/record/639388},
}