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The chain-type nodal loops in the reciprocal space can generate exotic nodalchain fermions. Here, we report that Li2XY (X = Ca, Ba; Y = Si, Ge) compoundsare ideal inner nodal chain semimetals. Their band structures are composed oftwo connecting nodal loops with either hybrid or type-I band dispersion. Thesignatures of the nodal chain, such as the nontrivial surface states, are quitepronounced in these Li2XY compounds since there is only a single inner nodalchain without other extraneous bands near the Fermi level. These compounds areexisting materials and ambient-stable, which is available to realize theexperimental detection of inner nodal chain fermions or further the practicalapplications.

Ideal inner nodal chain semimetals in Li2XY (X = Ca, Ba; Y = Si, Ge) materials