Akademik Veri Yönetim Sistemi
Physica E: Low-Dimensional Systems and Nanostructures, cilt.182, 2026 (SCI-Expanded, Scopus)
In this study, we derive analytical results for two-dimensional single-layer orthorhombic monochalcogenides in the presence of substrate-induced electron surface optical (SO) phonon interactions. The Lee–Low–Pines variational approximation within conventional polaron theory is employed to examine substrate effects within a low-energy effective model. Based on this framework, we construct a phonon-dressed Hamiltonian to elucidate the influence of SO phonons on the electronic band structure. We further investigate the bulk photovoltaic effect, focusing on the shift-current mechanism by which illumination generates a coherent zero-bias direct current. Our results demonstrate that substrate-induced SO phonons not only renormalize the band structure of inversion symmetry–breaking systems but also give rise to a stable photocurrent under light exposure, corresponding to a phonon-assisted second-order nonlinear optical response. These findings reveal that the shift current is highly sensitive to structural modifications, offering a viable route for tuning photovoltaic performance in two-dimensional materials.