title: Tunable electronic and optical properties of monolayer silicane under tensile strain: a many-body study.
abstract: The electronic structure and optical response of silicane to strain are investigated by employing first-principles calculations based on many-body perturbation theory. The bandgap can be efficiently engineered in a broad range and an indirect to direct bandgap transition is observed under a strain of 2.74%; the semiconducting silicane can even be turned into a metal under a very large strain. The transitions derive from the persistent downward shift of the lowest conduction band at the Γ-point upon an increasing strain. The quasi-particle bandgaps of silicane are sizable due to the weak dielectric screening and the low dimension; they are rapidly reduced as strain increases while the exciton bound energy is not that sensitive. Moreover, the optical absorption edge of the strained silicane significantly shifts towards a low photon energy region and falls into the visible light range, which might serve as a promising candidate for optoelectronic devices.
authors.affiliation: Department of Physics & Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 211189, China.
authors.forename: Huabing
authors.initials: H
authors.lastname: Shu
authors.affiliation: Department of Physics & Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 211189, China.
authors.forename: Shudong
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Physics & Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 211189, China.
authors.forename: Yunhai
authors.initials: Y
authors.lastname: Li
authors.affiliation: Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.
authors.forename: Joanne
authors.initials: J
authors.lastname: Yip
authors.affiliation: Department of Physics & Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 211189, China.
authors.forename: Jinlan
authors.initials: J
authors.lastname: Wang