Presentation Information
[17a-M_178-7]Shift Current in Two-Dimensional Ferroelectric Multidomain Structures
〇(DC)Tomoaki Kameda1, Katsunori Wakabayashi1 (1.Kwansei Gakuin Univ.)
Keywords:
shift current,two-dimensional ferroelectric,multidomain structure
he bulk photovoltaic effect (BPVE) is a nonlinear optical phenomenon in which a direct current is generated under uniform light irradiation without applying an external electric field. One representative contribution to the BPVE is the shift current, which originates from the real-space displacement of the electronic charge center during optical excitation. Owing to its geometric origin described by the Berry connection of bulk wave functions, the shift current is expected to be robust against scattering and promising for high-efficiency optoelectronic applications.
Ferroelectric materials ubiquitously host multidomain structures and domain walls, where recent experiments have revealed nonlinear optical responses distinct from bulk properties, attracting growing interest in the role of domain structures in the BPVE. In addition, two-dimensional ferroelectric materials such as SnS and GeS have recently attracted attention due to their potential for device miniaturization and novel functionalities.
In this study, we theoretically investigate the mechanism of shift-current generation in multidomain structures of two-dimensional ferroelectrics by employing a two-dimensional Su–Schrieffer–Heeger model with explicitly introduced polarization domains.
Ferroelectric materials ubiquitously host multidomain structures and domain walls, where recent experiments have revealed nonlinear optical responses distinct from bulk properties, attracting growing interest in the role of domain structures in the BPVE. In addition, two-dimensional ferroelectric materials such as SnS and GeS have recently attracted attention due to their potential for device miniaturization and novel functionalities.
In this study, we theoretically investigate the mechanism of shift-current generation in multidomain structures of two-dimensional ferroelectrics by employing a two-dimensional Su–Schrieffer–Heeger model with explicitly introduced polarization domains.