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Left: Transverse Peierls transition driven chiral lattice distortions. The colored circles represent distorted atoms with different z-axis coordinates. The electron-TA phonon coupling induces a chiral CDW, TA phonon softening, and an s-wave electronic gap function (colormap in the center) that preserve the screw C4 symmetry. Right: Temperature dependent phonon dispersion shows a large energy renormalization on TA modes, whereas the longitudinal acoustic (LA) phonon is hardened.
Scientific Achievement: The electron-transverse acoustic (TA) phonon coupling is found to create a chiral charge density wave (CDW) in the topological magnet EuAl4.
Significance and Impact: The new mechanism opens a new avenue to realizing chiral and nematic phenomena and may enable energy-efficient microelectronics.
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