Exciton-plasmon polariton coupling and hot carrier generation in two-dimensional SiB semiconductors: a first-principles study

Nanophotonics

article

Ali Ramazani¹  Farzaneh Shayeganfar²  Jaafar Jalilian³  Nicholas X. Fang¹ 

[1] Department of Mechanical Engineering, Massachusetts Institute of Technology;Department of Civil and Environmental Engineering, Rice University;Department of Physics, College of Sciences, Yasouj University

关键词: surface plasmon;    hot carrier;    valley polaritons;    luminescence;    strain engineering;   

DOI  :  10.1515/nanoph-2019-0363

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Exciton (strong electron–hole interactions) and hot carriers (HCs) assisted by surface plasmon polaritons show promise to enhance the photoresponse of nanoelectronic and optoelectronic devices. In the current research, we develop a computational quantum framework to study the effect of coupled exciton and HCs on the photovoltaic energy distribution, scattering process, polarizability, and light emission of two-dimensional (2D) semiconductors. Using a stable 2D semiconductor (semihydrogenated SiB) as our example, we theoretically show that external strain and thermal effect on the SiB can lead to valley polarized plasmon quasiparticles and HC generation. Our results reveal that the electron–phonon and electron–electron (e–e) interactions characterize the correlation between the decay rate, scattering of excitons, and generation of HCs in 2D semiconductors. Moreover, phonon assisted luminescence spectra of SiB suggest that light emission can be enhanced by increasing strain and temperature. The polarized plasmon with strong coupling of electronic and photonics states in SiB makes it as a promising candidate for light harvesting, plasmonic photocurrent devices, and quantum information.

【 授权许可】

CC BY