scholarly journals Robustness of edge states in graphene quantum dots

2010 ◽  
Vol 82 (4) ◽  
Author(s):  
M. Wimmer ◽  
A. R. Akhmerov ◽  
F. Guinea
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Edge States

Formation mechanism of graphene quantum dots and their edge state conversion probed by photoluminescence and Raman spectroscopy

2016 ◽  
Vol 4 (46) ◽  
pp. 10852-10865 ◽  
Author(s):  
Gone Rajender ◽  
P. K. Giri
Keyword(s):  
Quantum Dots ◽  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Formation Mechanism ◽  
Graphene Quantum Dots ◽  
Edge State ◽  
Edge States ◽  
Gas Environment

The formation mechanism of graphene quantum dots (GQDs) from a graphene oxide (GO) precursor is elucidated and the inter-conversion of edge states in GQDs by annealing under a controlled gas environment is studied by various microscopic and spectroscopic tools.

Mixed magnetic edge states in graphene quantum dots

2021 ◽  
Author(s):  
Junyao Li ◽  
Xiaofeng Liu ◽  
Lingyun Wan ◽  
Xinming Qin ◽  
Wei Hu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Density Functional ◽  
Large Scale ◽  
Graphene Quantum Dots ◽  
Density Functional Theory Calculations ◽  
Edge States ◽  
Functional Theory ◽  
Spin Polarized ◽  
Spin Arrangement ◽  
Magnetic States

Abstract Graphene quantum dots (GQDs) exhibit abundant magnetic edge states with promising applications in spintronics. Hexagonal zigzag GQDs possess a ground state with an antiferromagnetic (AFM) inter-edge coupling, followed by a metastable state with ferromagnetic (FM) inter-edge coupling. By analyzing the Hubbard model and performing large-scale spin-polarized density functional theory calculations containing thousands of atoms, we predict a series of new mixed magnetic edge states of GQDs arising from the size effect, namely mix-n, where n is the number of spin arrangement parts at each edge, with parallel spin in the same part and anti-parallel spin between adjacent parts. In particular, we demonstrate that the mix-2 state of bare GQDs (C6N2) appears when N ≥ 4 and the mix-3 state appears when N ≥ 6, where N is the number of six-membered-ring at each edge, while the mix-2 and mix-3 magnetic states appear in the hydrogenated GQDs with N = 13 and N = 15, respectively.

Preparation of Graphene Quantum Dots and Their Biological Applications

2016 ◽  
Vol 31 (4) ◽  
pp. 337 ◽  
Author(s):  
SUN Xiao-Dan ◽  
LIU Zhong-Qun ◽  
YAN Hao
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Biological Applications

Effect of graphene quantum dots on intestinal imaging and mesenteric microcirculation in mice

2014 ◽  
Vol 35 (4) ◽  
pp. 372
Author(s):  
Yong-qiang MA ◽  
Zhen-guo WANG ◽  
Xue-li GOU ◽  
Na LI ◽  
Ya-qiang FENG ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Mesenteric Microcirculation
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