Electrically Tunable and Reconfigurable Topological Edge State Lasers

Understand

We report an actively tunable topological edge mode laser in a one-dimensional Su-Schrieffer-Heeger (SSH) laser chain, where the SSH chain is realized in an electrically-injected Fabry-Perot (FP) laser chain.

• A non-Hermitian SSH model is developed to investigate the SSH laser chain with tunable active topological defect.
• We theoretically demonstrate topological edge mode phase transition in the SSH laser chain.
• The phase transition manifested in the tight binding SSH laser chain is observed experimentally and agreed well with the theoretical predictions.