Frontiers Ideal phononic charge-two nodal point and long nontrivial surface arcs in Na2Zn2O3
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Topological nodal-point phononic systems - ScienceDirect
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Ideal nodal-net, nodal-chain, and nodal-cage phonons in some realistic materials - Physical Chemistry Chemical Physics (RSC Publishing) DOI:10.1039/D2CP00731B
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Physical Review Materials - Volume 5 Issue 12