67 citations · 112 across the 7 of their papers we have counts for
4 papers · 1 filter
Unconventional topological phase transition of the Hopf insulator
Sunje Kim, Ysun Choi, Hyeongmuk Lim +1
The topological phase transition between two band insulators is mediated by a gapless state whose low-energy band structure normally contains sufficient information for describing…
Quantum Valley Hall effect without Berry curvature
Rasoul Ghadimi, Chiranjit Mondal, Sunje Kim +1
The quantum valley Hall effect (QVHE) is characterized by the valley Chern number (VCN) in a way that one-dimensional (1D) chiral metallic states are guaranteed to appear at the do…
Real Hopf Insulator
Hyeongmuk Lim, Sunje Kim, Bohm-Jung Yang
Establishing the fundamental relation between the homotopy invariants and the band topology of Hamiltonians has played a critical role in the recent development of topological phas…
Linking structures of doubly charged nodal surfaces in centrosymmetric superconductors
Sunje Kim, Dong-Choon Ryu, Bohm-Jung Yang
In topological semimetals and nodal superconductors, band crossings between occupied and unoccupied bands form stable nodal points/lines/surfaces carrying quantized topological cha…