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Second harmonic generation via double topological disclination states.

Lanxin Luo, Xiaoyu Dai, Weipeng Hu

|January 16, 2025

Summary

Researchers explored second harmonic generation in topological disclination states (TDS) within topological insulators. They demonstrated a method using coupled TDS to achieve efficient and robust nonlinear effects, opening new avenues for topological defect research.

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Area of Science:

Condensed Matter Physics
Nonlinear Optics
Topological Materials

Background:

Topological insulators (TIs) exhibit unique edge and corner states with distinct properties.
Topological disclination states (TDS) in TIs are known for strong localization.
Second harmonic generation (SHG) has been observed in other topological states but not TDS.

Purpose of the Study:

To investigate and demonstrate second harmonic generation (SHG) in topological disclination states (TDS).
To propose a novel scheme for achieving SHG in TDS by coupling double TDS.
To explore the potential of TDS for nonlinear optical applications.

Main Methods:

Theoretical proposal of a scheme involving the coupling of double TDS.
Analysis of the conditions required for SHG in the coupled TDS system.
Investigation of the conversion efficiency and robustness of the generated SHG.

Main Results:

A scheme for satisfying the SHG condition in coupled double TDS was successfully proposed.
High conversion efficiency for SHG was demonstrated.
The generated SHG exhibited strong robustness against disorder due to doubly resonant TDS.

Conclusions:

The study successfully demonstrates SHG in topological disclination states (TDS) for the first time.
Coupling double TDS provides an effective route to achieve efficient and robust nonlinear optical effects.
This work offers a new perspective on nonlinear phenomena in topological states and topological defects.