Tailoring plasmon excitations in α − T3 armchair nanoribbons

Abstract

We have calculated and investigated the electronic states, dynamical polarization function and the plasmon excitations for α − T3 nanoribbons with armchair-edge termination. The obtained plasmon dispersions are found to depend significantly on the number of atomic rows across the ribbon and the energy gap which is also determined by the nanoribbon geometry. The bandgap appears to have the strongest effect on both the plasmon dispersions and their Landau damping. We have determined the conditions when relative hopping parameter α of an α − T3 lattice has a strong effect on the plasmons which makes our material distinguished from graphene nanoribbons. Our results for the electronic and collective properties of α − T3 nanoribbons are expected to find numerous applications in the development of the next-generation electronic, nano-optical and plasmonic devices.

Plasmon damping rates in Coulomb-coupled two-dimensional layers in a heterostructure

“…Several investigations have been carried out on both graphene and silicene with respect to transport phenomena [9][10][11][12][13][14][15][16][17] , as well as their magnetic and electric field effects [18][19][20][21][22][23][24][25] , the fabrication process [26][27][28][29] , and on plasmonic behavior [30][31][32][33][34][35][36][37][38] . An intensive literature search on the plasmonic studies suggests that no study on the plasmon dispersion and its rate of damping was carried out for composite silicene and graphene materials.…”

Developing a semiclassical Wentzel-Kramers-Brillouin theory for $α-\mathcal{T}_3$ model

“…The effect and the "weight" of the electron transition from and into this flat band is defined by a quantum phase φ and ranges from 0 (graphene with a completely uncoupled flat band) and a dice lattice with φ = π/4 and the strongest possible effect of the flat band. These highly unusual energy dispersions result in unique and truly fascinating electronic, [29][30][31][32][33][34][35][36] transport, [37][38][39][40] optical, [41][42][43][44] and magnetic, [45][46][47][48][49][50][51] properties of these innovative materials, which are very different from those in graphene. 52 Together with tilted Dirac cone materials [53][54][55] and topological Dirac semimetals 56,57 , α − T 3 materials are considered the most promising and innovating low-dimensional lattices at the preset time.…”

Floquet engineering of titled and gapped Dirac materials

“…The electron-photon dressed states been studied in a variety of two-dimensional materials: 18,19 nanotubes, [20][21][22] graphene, 14,[23][24][25] silicene, 26 transitional metal dichalcogenides, 27 dice lattice and α−T 3 , [28][29][30][31][32] various types of nanoribbons [33][34][35] , anisotropic phosphorene 36 and others. [37][38][39][40] The effect of circularly polarized dressing field was examined in silicene, one of the isotropic limiting cases for 1T -MoS 2 .…”