Many-body quadrupolar sum rule for higher-order topological insulators
W Lee, GY Cho, B Kang - Physical Review B, 2022 - APS
The modern theory of polarization establishes the bulk-boundary correspondence for the
bulk polarization. In this paper, we attempt to extend it to a sum rule of the bulk quadrupole …
bulk polarization. In this paper, we attempt to extend it to a sum rule of the bulk quadrupole …