Two-dimensional topological nodal line semimetal in layered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>X</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Y</mml:mi></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>X</mml:mi><mml:mspace width="0.28em"/><mml:mo>=</mml:mo><mml:mspace width="0.28em"/><mml:mi>Ca</mml:mi></mml:math>, Sr, and Ba;<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Y</mml:mi><mml:mspace width="0.28em"/><mml:mo>=</mml:mo><mml:mspace width="0.28em"/><mml:mi>As</mml:mi></mml:math>, Sb, and Bi)
Chengwang Niu(Shandong University), Yuriy Mokrousov(Forschungszentrum Jülich), Patrick M. Buhl(Forschungszentrum Jülich), Daniel Wortmann(Forschungszentrum Jülich), Ying Dai(Shandong University), Stefan Blügel(Forschungszentrum Jülich), Gustav Bihlmayer(Forschungszentrum Jülich)
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