Room-Temperature Bound Exciton with Long Lifetime in Monolayer GaN

CORC > 宁波材料技术与工程研究所 > 中国科学院宁波材料技术与工程研究所 > 2018专题

	Room-Temperature Bound Exciton with Long Lifetime in Monolayer GaN
	Zhang, Hao; Peng, Bo; Shao, Hezhu; Xu, Ke; Ni, Gang; Wu, Liangcai; Li, Jing; Lu, Hongliang; Jin, Qingyuan; Zhu, Heyuan
刊名	ACS PHOTONICS
	2018
卷号	5 期号:10 页码:4081-4088
关键词	1st Principles Calculations Ab-initio Calculation Energy Semiconductors Excitations Insulators Absorption Spectra
英文摘要	The synthesis of two-dimensional GaN offers new opportunities for this important commercial semiconductor in optoelectronic devices because the extreme quantum confinement enables additional control of its optical properties. Using first-principles calculations based on many body Green's function theory, we demonstrate that in monolayer GaN, a large band gap of 5.387 eV is governed by enhanced electron electron correlations. Strong electron hole interactions due to weak screening lead to strongly bound excitons with a large binding energy of 1.272 eV. These tightly bound excitons result in strong absorption peaks in the middle ultraviolet region. The dynamical screening between electron hole pairs is totally different from bare Coulomb interaction. Long quasiparticle (quasielectron, quasihole, and exciton) lifetimes are observed as a result of the many-body interactions. Because of the large binding energies, long exciton lifetimes, and large quantum degeneracy, an excitonic Bose Einstein condensate can be observed experimentally. Our results indicate the importance of many-body effects in exploring the optical performance of novel GaN optoelectronic nanodevices.
学科主题	Biophysics ; Biotechnology & Applied Microbiology ; Chemistry ; Electrochemistry ; Science & Technology - Other Topics
语种	英语
公开日期	2018-12-04
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/17147]
专题	2018专题
推荐引用方式 GB/T 7714	Zhang, Hao,Peng, Bo,Shao, Hezhu,et al. Room-Temperature Bound Exciton with Long Lifetime in Monolayer GaN[J]. ACS PHOTONICS,2018,5(10):4081-4088.
APA	Zhang, Hao.,Peng, Bo.,Shao, Hezhu.,Xu, Ke.,Ni, Gang.,...&Zhu, Heyuan.(2018).Room-Temperature Bound Exciton with Long Lifetime in Monolayer GaN.ACS PHOTONICS,5(10),4081-4088.
MLA	Zhang, Hao,et al."Room-Temperature Bound Exciton with Long Lifetime in Monolayer GaN".ACS PHOTONICS 5.10(2018):4081-4088.