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Disorder and diffuse scattering in single-chirality ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">TaSe</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow><mml:mtext>I</mml:mtext></mml:math> crystals
The chiral charge density wave material (TaSe${}_{4}$)${}_{2}$I contains a half-filled Ta $d$-orbital, which creates Weyl points in a metallic band structure. However, historical measurements show insulating electrical transport. The authors use single-crystal diffraction and transmission electron microscopy to show that large single crystals have pristine chirality: they can exhibit a …