Opto-electronic properties of twisted bilayer graphene quantum dots

Tiutiunnyk, A.; Duque, C.A.; Caro-Lopera, Francisco J.; Correa, J.D.

doi:10.1016/j.physe.2019.03.028

Cited by 33 publications

(21 citation statements)

References 37 publications

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“…Graphene quantum dots (GQDs) are graphenes with finite size, which can be fabricated by bottom-up and top-down synthesis approaches [1,2]. Several theoretical studies were already performed studying the electronic and optical properties of GQDs [3][4][5][6][7], analyzing the influence of size, shape, functional groups and gas adsorption on electronic and optical properties.…”

Section: Introductionmentioning

confidence: 99%

Density functional theory model for carbon dot surfaces and their interaction with silver nanoparticles

Ambrusi

Arroyave

Centurión

et al. 2019

Physica E: Low-dimensional Systems and Nanostructures

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Density functional theory (DFT) and time dependent density functional theory (TDDFT) calculations were performed to represent carbon dots surfaces. The addition of different oxygen functional groups to the aromatic carbon core structure and the stability in the interaction with silver nanoparticles was also investigated. Adsorption energies were evaluated in order to compare the competition for adsorption sites on silver surface with D-glucose and D-gluconate ion molecules. The -COOH and -COO groups and the interaction of the latter with silver were proposed to explain some features of the UV-visible absorption spectra, which could also contribute to an explanation for the charge observed on carbon dot surfaces.

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Section: Introductionmentioning

confidence: 99%

Density functional theory model for carbon dot surfaces and their interaction with silver nanoparticles

Ambrusi

Arroyave

Centurión

et al. 2019

Physica E: Low-dimensional Systems and Nanostructures

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“…and twisted [24] BLG. The properties of two or more coupled quantum dots in BLG have also been studied experimentally and theoretically [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Electronic properties of bilayer graphene with magnetic quantum structures studied using the Dirac equation

Park,

Kim,

Kim

2021

Preprint

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The electronic properties of bilayer graphene with a magnetic quantum dot and a magnetic quantum ring are investigated. The eigenenergies and wavefunctions of quasiparticle states are calculated analytically by solving decoupled fourth-order differential equations. For the magnetic quantum dot, in the case of a negative inner magnetic field, two peculiar characteristics of the eigenenergy evolution are found: (i) the energy eigenstates change in a stepwise manner owing to energy anticrossing and (ii) the quantum states approach zero energy. For the magnetic quantum ring, there is an angular momentum transition of eigenenergy as the inner radius of the ring varies, and the Aharonov-Bohm effect is observed in the eigenenergy spectra for both positive and negative magnetic fields inside the inner radius.

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“…The effect of twisting on the electronic and transport properties of bilayer graphene (BLG) nanostructures has also been recently addressed in Refs. [31][32][33][34][35][36][37]. Within today's technology, such as nanolithography, it is possible to realize such two-dimensional nanostructures on a scale of a few tens [38,39] or even only a few [40,41] nanometers as well as in different types of graphene layer stackings [42,43].…”

Section: Introductionmentioning

confidence: 99%

Isolated and hybrid bilayer graphene rings

Mirzakhani,

da Costa,

Peeters

2021

Preprint

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Using the continuum model, we investigate the electronic properties of two types of bilayer graphene ring (BLGR) geometries: (i) an isolated BLGR and (ii) a monolayer graphene (MLG) ring put on top of an infinite graphene sheet. Solving the Dirac-Weyl equation in the presence of a perpendicular magnetic field and applying infinite-mass boundary condition at the ring boundaries, we obtain analytical results for the energy levels and corresponding wave spinors for both structures. Our results show that the presence of interface boundary in a hybrid BLGR modifies drastically the energy levels as compared to that of an isolated BLGR. The intervalley symmetry E K e (m) = −E K h (m) between the electron (e) and hole (h) states (m being the angular momentum quantum number) is found for the energy spectrum of an isolated BLGR, while it is broken for the hybrid BLGR. Our analytical results agree with those obtained within the tight-binding model (TBM). Sizeable and magnetically tunable band gap, in contrast to that in the zero-width BLGR model, is predicted for both ring structures, which experimentally can be measured in, e.g., magnetotransport measurements.

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Opto-electronic properties of twisted bilayer graphene quantum dots

Cited by 33 publications

References 37 publications

Density functional theory model for carbon dot surfaces and their interaction with silver nanoparticles

Density functional theory model for carbon dot surfaces and their interaction with silver nanoparticles

Electronic properties of bilayer graphene with magnetic quantum structures studied using the Dirac equation

Isolated and hybrid bilayer graphene rings

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