scholarly journals Band structure of a two-dimensional Dirac semimetal from cyclotron resonance

2017 ◽  
Vol 96 (15) ◽  
Author(s):  
A. M. Shuvaev ◽  
V. Dziom ◽  
N. N. Mikhailov ◽  
Z. D. Kvon ◽  
Y. Shao ◽  
...  
Keyword(s):  
Band Structure ◽  
Cyclotron Resonance ◽  
Two Dimensional ◽  
Dirac Semimetal

scholarly journals Effects of Dirac cone tilt in a two-dimensional Dirac semimetal

2018 ◽  
Vol 98 (19) ◽  
Author(s):  
Zhao-Kun Yang ◽  
Jing-Rong Wang ◽  
Guo-Zhu Liu
Keyword(s):  
Two Dimensional ◽  
Dirac Cone ◽  
Dirac Semimetal

scholarly journals Transformation Between 2D and 3D Covalent Organic Frameworks via Reversible [2+2] Cycloaddition

2020 ◽  
Author(s):  
Thaksen Jadhav ◽  
Yuan Fang ◽  
Cheng-Hao Liu ◽  
Afshin Dadvand ◽  
Ehsan Hamzehpoor ◽  
...  
Keyword(s):  
Band Structure ◽  
Absorption Edge ◽  
Room Temperature ◽  
Three Dimensional ◽  
Cross Linking ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Doping Behavior ◽  
2D Polymers ◽  
2D And 3D

We report the first transformation between crystalline vinylene-linked two-dimensional (2D) polymers and crystalline cyclobutane-linked three-dimensional (3D) polymers. Specifically, absorption-edge irradiation of the 2D poly(arylenevinylene) covalent organic frameworks (COFs) results in topological [2+2] cycloaddition cross-linking the π-stacked layers in 3D COFs. The reaction is reversible and heating to 200°C leads to a cycloreversion while retaining the COF crystallinity. The resulting difference in connectivity is manifested in the change of mechanical and electronic properties, including exfoliation, blue-shifted UV-Vis absorption, altered luminescence, modified band structure and different acid-doping behavior. The Li-impregnated 2D and 3D COFs show a significant ion conductivity of 1.8×10<sup>−4</sup> S/cm and 3.5×10<sup>−5</sup> S/cm, respectively. Even higher room temperature proton conductivity of 1.7×10<sup>-2</sup> S/cm and 2.2×10<sup>-3</sup> S/cm was found for H<sub>2</sub>SO<sub>4</sub>-treated 2D and 3D COFs, respectively.

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