Tailoring plasmon excitations in $$\alpha -{\mathcal {T}}_3$$ armchair nanoribbons

Iurov, Andrii; Zhemchuzhna, Liubov; Gumbs, Godfrey; Huang, Danhong; Fekete, Paula; Anwar, Farhana; Dahal, Dipendra; Weekes, Nicholas

doi:10.1038/s41598-021-99596-z

Cited by 26 publications

(11 citation statements)

References 92 publications

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“…[30][31][32][33][34][35][36][37][38][39][40] and plasmon excitations were studied in Refs. [37,38,[41][42][43][44]. In 3D, similar multifold energy spectra with spin-1 and even higher-spin fermions were proposed in Ref.…”

Section: Introductionsupporting

confidence: 74%

Optical conductivity of bilayer dice lattices

Sukhachov¹,

Oriekhov²,

Gorbar³

2023

Preprint

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We calculate optical conductivity for bilayer dice lattices whose commensurate stackings and effective models in the vicinity of band-crossing points were considered in our previous work [1]. The inter-band optical conductivity reveals a rich activation behavior unique for each of the four stackings. We found that the intermediate energy band, which corresponds to the flat band of a single-layer dice lattice, plays a different role for different stackings. The results for effective and tight-binding models are found to be in qualitative agreement for some of the stackings and the reasons for the discrepancies for others are identified. Our findings propose optical conductivity as an effective tool to distinguish between different stackings in bilayer dice lattices.

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Section: Introductionsupporting

confidence: 74%

Optical conductivity of bilayer dice lattices

Sukhachov¹,

Oriekhov²,

Gorbar³

2023

Preprint

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“…For a finite-angle collision, however, a complete transmission also appears for an oblique (not a normal) incidence due to presence of Fabry-Perot resonances. Such a Klein-tunneling behavior was investigated for all Dirac-cone materials and nano-ribbons [49,53,54], including transport in Kekulé-distorted graphene nanoribbons [49]. Specifically, a magic transmission was demonstrated for α-T 3 materials and dice lattice [55][56][57][58], in additional to unusual tunneling behavior of anisotropic Dirac electrons [59][60][61].…”

Section: Of 15mentioning

confidence: 98%

Application of WKB Theory to Investigating Electron Tunneling in Kek-Y Graphene

Iurov¹,

Zhemchuzhna²,

Gumbs³

et al. 2023

Preprint

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In this paper, we have constructed a WKB approximation for graphene having a Y-shaped Kekul\'e lattice distortion and a special folding of the $\mbox{\boldmath$K$}$ and $\mbox{\boldmath$K$}^\prime$ valleys, which leads to very specific linear energy dispersions with two non-equivalent pairs of subbands. These obtained semi-classical results, which include the action, electron momentum and wave functions, are utilized to analyze the dynamics of electron tunneling through non-square potential barriers. In particular, we explore resonant scattering of an electron by a potential barrier built on Kekul\'e-distorted graphene. Mathematically, a group of consecutive equations for a semi-classical action have been solved by following a perturbation approach under the condition of small strain-induced coupling parameter $\Delta_0 \ll 1$ (a good fit to its actual value $\Delta_0 \backsim 0.1$). Specifically, we consider a generalized model for Kek-Y graphene with two arbitrary Fermi velocities. The dependence of the electron transmission amplitude on the potential profile $V(x)$ and band parameters of Kekul\'e-patterned graphene has been explored and analyzed in details.

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“…Electron-photon dressed states have been studied in a variety of two-dimensional materials 23 , 24 , including nanotubes 25 – 27 , graphene 14 , 28 – 30 , silicene 31 , transitional-metal dichalcogenides 32 , dice lattice and materials 33 – 37 , various types of nanoribbons 38 – 40 , anisotropic phosphorene 41 and etc. 42 – 45 Particularly, the effect of a circularly-polarized dressing field was examined in silicene, as one of the isotropic limiting cases of 1T -MoS .…”

Section: Introductionmentioning

confidence: 99%

Floquet engineering of tilted and gapped Dirac bandstructure in 1T$$^\prime$$-MoS$$_2$$

Iurov

Zhemchuzhna

Gumbs

et al. 2022

Sci Rep

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We have developed a rigorous theoretical formalism for Floquet engineering, investigating, and subsequently tailoring most crucial electronic properties of 1T$$^\prime$$ ′ -MoS$$_2$$ 2 by applying an external high-frequency dressing field within the off-resonance regime. It was recently demonstrated that monolayer semiconducting 1T$$^\prime$$ ′ -MoS$$_2$$ 2 exhibits tunable and gapped spin- and valley-polarized tilted Dirac bands. The electron-photon dressed states depend strongly on the polarization of the applied irradiation and reflect a full complexity of the low-energy Hamiltonian for non-irradiated material. We have calculated and analyzed the properties of the electron dressed states corresponding to linear and circular polarization of a dressing field by focusing on their symmetry, anisotropy, tilting, direct and indirect band gaps. Circularly polarized dressing field is known for transition into a new electronic state with broken time-reversal symmetry and a non-zero Chern number, and therefore, the combination of these topologically non-trivial phases and transitions between them could reveal some truly unique and previously unknown phenomena and applications. We have also computed and discussed the density of states for various types of 1T$$^\prime$$ ′ -MoS$$_2$$ 2 materials and its modification in the presence of a dressing field.

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Tailoring plasmon excitations in $$\alpha -{\mathcal {T}}_3$$ armchair nanoribbons

Cited by 26 publications

References 92 publications

Optical conductivity of bilayer dice lattices

Optical conductivity of bilayer dice lattices

Application of WKB Theory to Investigating Electron Tunneling in Kek-Y Graphene

Floquet engineering of tilted and gapped Dirac bandstructure in 1T$$^\prime$$-MoS$$_2$$

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