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	Room temperature broadband terahertz gains in graphene heterostructures based on inter-layer radiative transitions
	Tang, Linlong1,2; Du, Jinglei1; Shi, Haofei2; Wei, Dongshan2; Du, Chunlei2
	2014-10-01
摘要	We exploit inter-layer radiative transitions to provide gains to amplify terahertz waves in graphene heterostructures. This is achieved by properly doping graphene sheets and aligning their energy bands so that the processes of stimulated emissions can overwhelm absorptions. We derive an expression for the gain estimation and show the gain is insensitive to temperature variation. Moreover, the gain is broadband and can be strong enough to compensate the free carrier loss, indicating graphene based room temperature terahertz lasers are feasible. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
DOI	10.1063/1.4900487
发表期刊	AIP ADVANCES
ISSN	2158-3226
卷号	4期号:10页码:7
通讯作者	Tang, LL (reprint author), Sichuan Univ, Coll Phys & Technol, Key Lab High Energy Dens Phys & Technol, Chengdu 610064, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000344588200039
语种	英语