3 papers
cond-mat.mtrl-sci2022
Nodal lines in momentum space: topological invariants and recent realizations in photonic and other systems
Haedong Park, Wenlong Gao, Xiao Zhang +1
Topological insulators constitute one of the most intriguing phenomena in modern condensed matter theory. The unique and exotic properties of topological states of matter allow for…
cond-mat.mes-hall2021
Sign freedom of non-Abelian topological charges in phononic and photonic topological insulators
Haedong Park, Sang Soon Oh
The topological nature of nodal lines in a three-band system can be described by non-Abelian topological charges called quaternion numbers. Due to the gauge freedom of the eigensta…
physics.optics2021
Non-Abelian charged nodal links in dielectric photonic crystal
Haedong Park, Stephan Wong, Xiao Zhang +1
A nodal link is a special form of a line degeneracy (a nodal line) between adjacent bands in the momentum space of a three-dimensional topological crystal. Unlike nodal chains or k…