Topological zero-reflection points in multi-terminal quantum wire junctions
The study investigates exact zero-reflection points in multi-terminal quantum wire junctions with dihedral symmetry for N $\ge$ 4 terminals. Analysis of the scattering matrix reveals these reflectionless points are topologically protected by an integer winding number, ensuring stability against weak disorder. The work also explores how time-reversal symmetry breaking via magnetic flux can induce additional zero-reflection regimes.