Layer-parity-defined surface polarization in Nb${}_3$Cl${}_8$ for excitonic modulation at van der Waals interfaces

Xinyue Huang, Hansheng Xu, Yuchen Gao +10

The intrinsic symmetry breaking in the breathing kagome lattice of layered Nb${}_3$Cl${}_8$ provides a unique mechanism for realizing electrically polar surfaces. In each monolayer, th…