Electronic and Optical Properties of Graphene Quantum Dots: The Role of Many-Body Effects

2015 ◽  
Vol 119 (9) ◽  
pp. 4983-4989 ◽  
Author(s):  
Yunhai Li ◽  
Huabing Shu ◽  
Shudong Wang ◽  
Jinlan Wang
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Many Body ◽  
Electronic And Optical Properties ◽  
Many Body Effects

scholarly journals Electronic and optical properties of cadmium fluoride: The role of many-body effects

2013 ◽  
Vol 87 (7) ◽  
Author(s):  
Giancarlo Cappellini ◽  
Jürgen Furthmüller ◽  
Emiliano Cadelano ◽  
Friedhelm Bechstedt
Keyword(s):  
Optical Properties ◽  
Many Body ◽  
Cadmium Fluoride ◽  
Electronic And Optical Properties ◽  
Many Body Effects

Revealing the role of nitrogen dopants in tuning the electronic and optical properties of graphene quantum dots via a TD-DFT study

2020 ◽  
Vol 22 (48) ◽  
pp. 28230-28237
Author(s):  
Min Yang ◽  
Zan Lian ◽  
Chaowei Si ◽  
Bo Li
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Nitrogen Doping ◽  
Graphene Quantum Dots ◽  
Dft Study ◽  
Electronic And Optical Properties ◽  
Td Dft

The tunable electronic and optical properties of graphene quantum dots achieved by nitrogen doping

Tuning the electronic and optical properties of hexagonal boron-nitride nanosheet by inserting graphene quantum dots

2018 ◽  
Vol 32 (06) ◽  
pp. 1850084 ◽  
Author(s):  
Yi-Min Ding ◽  
Jun-Jie Shi ◽  
Min Zhang ◽  
Meng Wu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Graphene Quantum Dots ◽  
Band Gaps ◽  
Hybrid Structures ◽  
Electronic And Optical Properties ◽  
Boron Nitride Nanosheet ◽  
Optoelectronic Nanodevices

It is difficult to integrate two-dimensional (2D) graphene and hexagonal boron-nitride (h-BN) in optoelectronic nanodevices, due to the semi-metal and insulator characteristic of graphene and h-BN, respectively. Using the state-of-the-art first-principles calculations based on many-body perturbation theory, we investigate the electronic and optical properties of h-BN nanosheet embedded with graphene dots. We find that C atom impurities doped in h-BN nanosheet tend to phase-separate into graphene quantum dots (QD), and BNC hybrid structure, i.e. a graphene dot within a h-BN background, can be formed. The band gaps of BNC hybrid structures have an inverse relationship with the size of graphene dot. The calculated optical band gaps for BNC structures vary from 4.71 eV to 3.77 eV, which are much smaller than that of h-BN nanosheet. Furthermore, the valence band maximum is located in C atoms bonded to B atoms and conduction band minimum is located in C atoms bonded to N atoms, which means the electron and hole wave functions are closely distributed around the graphene dot. The bound excitons, localized around the graphene dot, determine the optical spectra of the BNC hybrid structures, in which the exciton binding energies decrease with increase in the size of graphene dots. Our results provide an important theoretical basis for the design and development of BNC-based optoelectronic nanodevices.

Electronic and optical properties of semiconductor and graphene quantum dots

2011 ◽  
Vol 7 (3) ◽  
pp. 328-352 ◽  
Author(s):  
Wei-dong Sheng ◽  
Marek Korkusinski ◽  
Alev Devrim Güçlü ◽  
Michal Zielinski ◽  
Pawel Potasz ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Electronic And Optical Properties

scholarly journals Optical properties of graphene nanoribbons: The role of many-body effects

2008 ◽  
Vol 77 (4) ◽  
Author(s):  
Deborah Prezzi ◽  
Daniele Varsano ◽  
Alice Ruini ◽  
Andrea Marini ◽  
Elisa Molinari
Keyword(s):  
Optical Properties ◽  
Graphene Nanoribbons ◽  
Many Body ◽  
Many Body Effects
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