176 citations · 596 across the 25 of their papers we have counts for
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cond-mat.mes-hall2019★ 42 cited
Pfaffian formalism for higher-order topological insulators
Heqiu Li, Kai Sun
We generalize the Pfaffian formalism, which has been playing an important role in the study of time-reversal invariant topological insulators (TIs), to 3D chiral higher-order topol…
cond-mat.str-el2019★ 7 cited
Diagnosis of topological nodal lines with nontrivial monopole charge in the presence of rotation symmetries
Heqiu Li, Chen Fang, Kai Sun
We discuss a general diagnosis scheme for topological nodal lines protected by time-reversal symmetry and space-inversion symmetry, in the absence of spin-orbit coupling. It is sho…