Polarized photoluminescence spectroscopy in WS2,WSe2 atomic layers and heterostructures by cylindrical vector beams

• 作者: Lijun Wu Cuihuan Ge Kai Braun Mai He Siman Liu Qingjun Tong Xiao Wang Anlian Pan
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: SPECIAL TOPIC—Optical field manipulation
• 页码范围: 45-52
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/abf3b6

摘要

Due to the large exciton binding energy,two-dimensional (2D) transition metal dichalcogenides (TMDCs) provide an ideal platform for studying excitonic states and related photonics and optoelectronics.Polarization states lead to distinct light-matter interactions which are of great importance for device applications.In this work,we study polarized photo-luminescence spectra from intralayer exciton and indirect exciton in WS2 and WSe2 atomic layers,and interlayer exciton in WS2/WSe2 heterostructures by radially and azimuthally polarized cylindrical vector laser beams.We demonstrated the same in-plane and out-of-plane polarization behavior from the intralayer and indirect exciton.Moreover,with these two laser modes,we obtained interlayer exciton in WS2/WSe2 heterostructures with stronger out-of-plane polarization,due to the formation of vertical electric dipole moment.