Site‐Controlled Excitation in Su–Schrieffer–Heeger Model‐Based Topological Lasers

We propose a novel topological laser design based on the Su–Schrieffer–Heeger (SSH) model that enables dynamically tunable domain walls through modulation of intra‐cell and inter‐cell coupling coefficients. By incorporating artificial gauge fields to control coupling phases, domain walls can be precisely positioned, overcoming the fixed‐position limitation in conventional systems. We develop a domain wall dynamics model using laser rate equations and demonstrate that selective pumping at domain wall positions provides enhanced topological protection compared with uniform pumping schemes. Numerical simulations confirm robust single‐mode lasing with controllable emission locations.