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Optically Active Fractional Wannier-Center Displacement Drives Giant Second-Harmonic Generation
Hongsheng Pang, Lixin He
Electric polarization is a static ground-state Berry-phase property, whereas second-harmonic generation (SHG) and shift current are dynamical optical responses. Their connection is…
Insulator-to-Metal Transitions Driven by Quantized Formal Polarization Mismatch
Hongsheng Pang, Lixin He
We propose a mechanism for insulator-to-metal (IM) transitions driven by the mismatch of quantized formal polarization (QFP), a symmetry-protected bulk invariant. For a material wi…
Quantized Polarization Redefines Polar Interfaces
Hongsheng Pang, Lixin He
In crystalline solids, the electronic polarization follows the \emph{generalized Neumann's principle}, under which all crystallographic point groups can, in principle, support ferr…
Generalized Neumann's Principle as a Unified Framework for Fractional Quantum and Conventional Ferroelectricity
Hongsheng Pang, Lixin He
Monolayer InSe exhibits unexpected in-plane polarization, despite having symmetry, a feature that was traditionally considered forbidden by symmetry. To explain thi…
Tuning of Berry Curvature Dipole in TaAs slabs: An effective Route to Enhance Nonlinear Hall Response
Hongsheng Pang, Gan Jin, Lixin He
In materials without inversion symmetry, Berry curvature dipole (BCD) arises from the uneven distribution of Berry curvature in momentum space. This leads to nonlinear anomalous Ha…