Diverse magnetic quantization in bilayer silicene

Do, Thi-Nga; Shih, Po Hsin; Gumbs, Godfrey; Huang, Danhong; Chiu, Chi-Tsung; Lin, Ming–Fa

doi:10.1103/physrevb.97.125416

Cited by 29 publications

(38 citation statements)

References 51 publications

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“…For example, the chemisorption-diversified fundamental properties are clearly revealed in the hydrogenated and oxidized silicene systems [115,114]. For pristine bilayer silicenes, their band properties across the Fermi level are predicted to be very sensitive to the stacking configurations, e.g., a semimetal with some free carrier densities [116], and a finite indirect-gap/direct-gap semiconductor [∼, 0.5 − 1.0 eV [107,117], being in sharp contrast with a very narrow gap of monolayer system [∼, 5 meV; [108]]. On the other hand, the third and fourth methods are quite efficient in studying the diverse physical phenomena after getting a set of reliable parameters for all the intrinsic interactions.…”

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confidence: 99%

“…The more complex interlayer hopping integrals and enhanced spin-orbital couplings, due to the rich bucklings and stackings, are very difficult to obtain even for bilayer silicenes. Up to date, the effective-mass can only deal with the fundamental properties for monolayer silicene under the external electric and magnetic fields, covering the in-orbital-induced slight separation of Dirac points, gatevoltage-created state splitting [117], and the magnetic-field-generated degenerate Landau levels and specific selection rule [117]. There are no excellent parameters for two pairs of low-lying valence and conduction bands in AAV and AB-stacked systems.…”

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confidence: 99%

“…However, the first pair nearest to the Fermi level is well fitted for the non-monotonous energy dispersions and the irregular/normal valleys. Apparently, the diversified Coulomb excitations and magnetic quantizations are effectively solved by the generalized tight-binding model, e.g., the diverse [momentum, frequency]-phase diagrams in monolayer silicene under the composite effects of spin-orbital interactions, electric potentials and magnetic fields, the inter-Landau-level and electron-gas-like magnetoplasmon modes with the rather strong electron-hole dampings for the same system [118], and the spin-and valley-split Landau levels of bilayer silicenes in the frequent non-crossings, crossings and anti-crossings [117]. The systematic investigations will be made on the fundamental properties of AA-and AB-stacked bilayer systems.…”

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confidence: 99%

“…However, it is almost impossible to induce the dispersionless Landau levels in nanotube surfaces under various high magnetic fields[85]. Dimensionality and magnetic quantization have a great influence on the van Have singularities of the density of states (DOS), so the magneto-electronic specific heats would be very different between these two systems.2.4 Electron energy loss spectroscopy and light inelastic scatteringsElectron energy loss spectroscopy [EELS; [96, 97, 86, 87, 88, 89, 94, 90, 91, 92, 93, 95] and inelastic x-ray scatterings [IXS;[107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122, 123,124]] are the only two available tools in delicately examining excitation spectra of condensed-matter systems. They have successfully identified the reliable Coulomb excitations and phonon dispersion spectra in any dimensional materials, being supported by the theoretical predictions[88, 89, 94, 90,92, 95].…”

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confidence: 99%

“…The inelastic X-ray scatterings [IXS] are capable of directly detecting the behaviors of dynamic charge screenings in crystal/non-crystal systems. They are successfully conducted on a wide range of physical phenomena, e.g., phonon energy dispersions in solids[107, 108], carrier dynamics of disordered materials[109, 110, 111, 112] & biological structures[107], and electronic excitations in condensed-matter systems[113,114,115,116,117,118,119].The transferred energy and momentum are available parameters and can cover the whole spectra of the dielectric responses. The uniform x-ray beam line is designed to provide a super-high photon flux within the typical wave-vector range of the first Brillouin zone.…”

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confidence: 99%

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Low dimensional materials have attracted great research interest from both theoretical and experimental point of views. These materials exhibit novel physical and chemical properties due to the confinement effect in low dimensions. The experimental observations of graphene open a new platform to study the physical properties of materials restricted to two dimensions. This featured article provides a review on the novel properties of quasi one‐dimensional (1D) material known as graphene nanoribbon. Graphene nanoribbons can be obtained by unzipping carbon nanotubes (CNT) or cutting the graphene sheet. Alternatively, it is also called the finite termination of graphene edges. It gives rise to different edge geometries, namely zigzag and armchair, among others. There are various physical and chemical techniques to realize these materials. Depending on the edge type termination, these are called the zigzag and armchair graphene nanoribbons (ZGNR and AGNR). These edges play an important role in controlling the properties of graphene nanoribbons. The present review article provides an overview of the electronic, transport, optical, and magnetic properties of graphene nanoribbons. However, there are different ways to tune these properties for device applications. Here, some of them, such as external perturbations and chemical modifications, are highlighted. Few applications of graphene nanoribbon have also been briefly discussed.

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Interband and intraband transition, dynamical polarization and screening of the monolayer and bilayer silicene in low-energy tight-binding model

2018

Indian J Phys

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We investigate the interband and intraband transition of the monolayer and AB-stacked bilayer silicene in low-energy tight-binding model under the electric field, where we focus on the dynamical polarization function, screening due to the charged impurity, and the plasmon dispersion. We obtain the logarithmically divergen polarization function within the random-phase-approximation (RPA) whose logarithmic singularities corresponds to the discontinuities of the first derivative which is at the momentum q = 2kF in static case and indicate the topological phase transition point from the gapless semimetal to the gapped band insulator. We also obtain the power-law-dependent Friedel oscillation which can be enhanced by increasing the Rashba-coupling, that can contribute to the screened potential of the charged impurity which scale as ∼ r −1/2 in the short distance from the impurity and scale as ∼ r −1/3 in the long distance from the impurity. In the single-particle excitation regime with the electron-hole continuum, the interband and intraband transition happen, and the plasmon dispersion, which we mainly focus on the optical plasmon (which ∼ √ q in long-wavelength limit) in this paper, start to damped into the electron-hole pairs due to the nonzero imaginary part of the polarization function. In low-frequency regime where the collective behavior and optical properties of the Dirac material relys more on the frequency than the fine structure constant, the intraband transition is dominate and it's found that completely undamped in the static case (ω = 0), which is due to the absence of the imaginary dynamic polarization. We also observe the linear (weakly damped) plasmon model for the classical bilayer silicene which is similar to the high-energy π-plasmon or the case of conducting substrate which with strong metallic screening in the bulk semiconductor. For the large carrier density, we find the plasmon diapersion has ωp ∼ n 1/2 which consistent with the quadratic dispersion around the Dirac-point like the bilayer silicene with the effective mass about the interlayer hopping (esperially when taking the Rashba-coupling and exchange field into consider) or the normal two-dimension electron gas, while in the little concentration limit, ωp ∼ n 1/4 which consistent with the linear dispersion like the monolayer silicene. Under the nonmagnetic impurity scattering, the Thomas-Fermi decay and Friedel oscillation can easily be observed due to the strong spin-orbit couopling of the bilayer silicene even we don't take the Rashba-coupling into consider. *

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Diverse magnetic quantization in bilayer silicene

Cited by 29 publications

References 51 publications

Diverse Quantization Phenomena in Layered Materials

Diverse Quantization Phenomena in Layered Materials

Electronic, transport, magnetic, and optical properties of graphene nanoribbons and their optical sensing applications: A comprehensive review

Interband and intraband transition, dynamical polarization and screening of the monolayer and bilayer silicene in low-energy tight-binding model

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