Magneto-electronic properties of multilayer graphenes

Lin, Chiun-Yan; Wu, Jhao Ying; Ou, Yih Jon; Chiu, Yu Huang; Lin, Ming–Fa

doi:10.1039/c5cp05013h

Cited by 63 publications

(89 citation statements)

References 241 publications

(962 reference statements)

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“…This singularity in energy dispersion lies at the origin of its diamagnetic susceptibility [37][38][39]. Although few-layer graphene (FLG) is more complicated, the zero band gap is retained [39]. Consequently, FLG also exhibits strong orbital diamagnetism which, unlike the case of a metal, overcomes its paramagnetic spin-spin coupling [38,39], and has been predicted to circulate at the edges of larger FLG flakes at room temperature considered here [40].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Even though the structural nature of electronic interactions of polyaromatic carbon and hydrocarbons are of fundamental interest [37][38][39], and lie at the heart of a huge range of research and potential applications [18], NMR has been little considered nor understood.…”

Section: Introductionmentioning

confidence: 99%

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NMR detects molecular interactions of graphene with aromatic and aliphatic hydrocarbons in water

et al. 2017

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IntroductionThe non-covalent interactions between polyaromatic carbon and the hydrocarbon-based structure of organic molecules are both of fundamental interest and a promising means of modifying graphene-based electronics [1][2][3][4][5][6][7], spintronics [8][9][10], optoelectronics and sensors [11][12][13][14]. The high relative surface area of graphene is attractive for the sequestration of xenobiotics in environmental [15][16][17] AbstractPolyaromatic carbon is widely held to be strongly diamagnetic and hydrophobic, with textbook van der Waals and 'π-stacked' binding of hydrocarbons, which disrupt their self-assembled supramolecular structures. The NMR of organic molecules sequestered by polyaromatic carbon is expected to be dominated by shielding from the orbital diamagnetism of π electrons. We report the first evidence of very different polar and magnetic behavior in water, wherein graphene remained well-dispersed after extensive dialysis and behaved as a 1 H-NMR-silent ghost. Magnetic effects dominated the NMR of organic structures which interacted with graphene, with changes in spinspin coupling, vast increase in relaxation, line broadening and decrease in NMR peak heights when bound to graphene. However, the interactions were weak, reversible and did not disrupt organic self-assemblies reliant on hydrophobic 'π-stacking', even when substantially sequestered on the surface of graphene by the high surface area available. Interacting assemblies of aromatic molecules retained their strongly-shielded NMR signals and remained within self-assembled structures, with slower rates of diffusion from association with graphene, but with no further shielding from graphene. Binding to graphene was selective for positively-charged organic assemblies, weaker for non-aromatic and negligible for strongly-negatively-charged molecules, presumably repelled by a negative zeta potential of graphene in water. Stronger binders, or considerable excess of weaker binders readily reversed physisorption, with no evidence of structural changes from chemisorption. The fundamental nature of these different electronic interactions between organic and polyaromatic carbon is considered with relevance to electronics, charge storage, sensor, medical, pharmaceutical and environmental research.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NMR detects molecular interactions of graphene with aromatic and aliphatic hydrocarbons in water

et al. 2017

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“…The Hamiltonin is built from the tight-binding functions on the distinct sublattices and layers, in which all the interactions and external fields are taken into account simultaneously. This method can deal with the the magnetic quantization of electronic states even in the presence of complicated geometric structures and external fields [30,31].…”

Section: Introductionmentioning

confidence: 99%

“…These will be directly reflected in the diverse magnetic quantization phenomena. The generalized tight-binding (TB) model is further developed to explore the essential properties in detail [30]. The Hamiltonin is built from the tight-binding functions on the distinct sublattices and layers, in which all the interactions and external fields are taken into account simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Field-induced diverse quantizations in monolayer and bilayer black phosphorus

Chen

Gumbs

et al. 2017

Phys. Rev. B

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Electronic properties of few-layer phosphorenes are investigated by the generalized tight-binding model. They are greatly diversified by the electric and magnetic fields (E z and B z ). The E z -induced gap transition, Dirac cones, oscillatory bands and critical points are present in bilayer system, but absent in monolayer one. The diverse magnetic quantization phenomena cover the coexistent two subgroups of Landau levels, the uniform and non-uniform energy spacings, and the crossing and anti-crossing behaviors. Specifically, the wavefunctions exhibit the dramatic changes between the well-behaved and multi-mode oscillations. The feature-rich energy spectra are reveled in density of states as .many special structures which could be verified from scanning tunneling spectroscopy.

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