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Evidence for bulk nodal loops and universality of Dirac-node arc surface states in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ZrGe</mml:mi><mml:msub><mml:mi>X</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math> ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>X</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mtext>S</mml:mtext></mml:mrow></mml:math> , Se, Te)
We have performed angle-resolved photoemission spectroscopy (ARPES) on layered ternary compounds $\mathrm{ZrGe}{X}_{c}$ (${X}_{c}=\text{S}$, Se, and Te) with square Ge lattices. ARPES measurements with bulk-sensitive soft-x-ray photons revealed a quasi-two-dimensional bulk-band structure with the bulk nodal loops protected by glide mirror symmetry of the crystal lattice. Moreover, high-resolution ARPES measurements near …