Stacking up Electron-Rich and Electron-Deficient Monolayers to Achieve Extraordinary Mid- to Far-Infrared Excitonic Absorption: Interlayer Excitons in the C3 B/ C3 N Bilayer

Tang，Zhao1; Cruz，Greis J.1; Jia，Fanhao1,2; Wu，Yabei3; Xia，Weiyi4; Zhang，Peihong1

2023-04-01

10.1103/PhysRevApplied.19.044085

Physical Review Applied   影响因子和分区

2331-7019

2331-7019

Our ability to efficiently detect and generate far-infrared (i.e., terahertz) radiation is vital in areas spanning from biomedical imaging to interstellar spectroscopy. Despite decades of intense research, bridging the terahertz gap between electronics and optics remains a major challenge due to the lack of robust materials that can efficiently operate in this frequency range, and two-dimensional (2D) type-II heterostructures may be ideal candidates to fill this gap. Herein, using highly accurate many-body perturbation theory within the GW plus Bethe-Salpeter equation approach, we predict that a type-II heterostructure consisting of an electron-rich C3N and an electron deficient C3B monolayers can give rise to extraordinary optical activities in the mid- to far-infrared range. C3N and C3B are two graphene-derived 2D materials that have attracted increasing research attention. Although both C3N and C3B monolayers are moderate-gap 2D materials, and they couple only through the rather weak van der Waals interactions, the bilayer heterostructure surprisingly supports extremely bright, low-energy interlayer excitons with large binding energies of 0.2-0.4 eV, offering an ideal material with interlayer excitonic states for mid- to far-infrared applications at room temperature. We also investigate in detail the properties and formation mechanism of the inter- and intralayer excitons.

SCI ; EI

英语

其他

National Science Foundation[DMREF-1626967] ; National Natural Science Foundation of China["12104207","11929401"]

Physics

Physics, Applied

WOS:001011196400003

AMER PHYSICAL SOC

20231914071405

Binding energy ; Electrons ; Graphene ; Medical imaging ; Monolayers ; Perturbation techniques ; Terahertz spectroscopy ; Terahertz waves ; Van der Waals forces

Biomedical Engineering:461.1 ; Electromagnetic Waves:711 ; Imaging Techniques:746 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Products Generally:804 ; Mathematics:921 ; Mechanics:931.1 ; Atomic and Molecular Physics:931.3

2-s2.0-85158892635

Scopus

1.Department of Physics,University at Buffalo,State University of New York,Buffalo,14260,United States
2.School of Materials Science and Engineering,International Centre of Quantum and Molecular Structures,Shanghai University,Shanghai,200444,China
3.Department of Materials Science and Engineering,Guangdong Provincial Key Lab for Computational Science and Materials Design,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
4.Ames Laboratory,U.S. Department of Energy,Iowa State University,Ames,50011,United States

Tang，Zhao,Cruz，Greis J.,Jia，Fanhao,et al. Stacking up Electron-Rich and Electron-Deficient Monolayers to Achieve Extraordinary Mid- to Far-Infrared Excitonic Absorption: Interlayer Excitons in the C3 B/ C3 N Bilayer[J]. Physical Review Applied,2023,19(4).

Tang，Zhao,Cruz，Greis J.,Jia，Fanhao,Wu，Yabei,Xia，Weiyi,&Zhang，Peihong.(2023).Stacking up Electron-Rich and Electron-Deficient Monolayers to Achieve Extraordinary Mid- to Far-Infrared Excitonic Absorption: Interlayer Excitons in the C3 B/ C3 N Bilayer.Physical Review Applied,19(4).

Tang，Zhao,et al."Stacking up Electron-Rich and Electron-Deficient Monolayers to Achieve Extraordinary Mid- to Far-Infrared Excitonic Absorption: Interlayer Excitons in the C3 B/ C3 N Bilayer".Physical Review Applied 19.4(2023).