Strong two-dimensional plasmon in Li-intercalated hexagonal boron-nitride film with low damping

Lončarić, Ivor; Rukelj, Zoran; Silkin, V. M.; Despoja, Vito

doi:10.1038/s41699-018-0078-y

Cited by 22 publications

(16 citation statements)

References 65 publications

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“…Recently, a new class of structurally stable quasi-2D conductors were presented [1][2][3][4] with a free-electron-like conduction band. These systems are realized as three layered crystal heterostructures held together by the van der Waals interaction.…”

Section: Introductionmentioning

confidence: 99%

Dynamical conductivity of lithium-intercalated hexagonal boron nitride films: A memory function approach

Rukelj

2020

Phys. Rev. B

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This work is a study of dynamical conductivity of a quasi-two-dimensional heterostructure Li(BN) 8 . The conducting electrons have a free-electron-like parabolic dispersion and are assumed to scatter only on acoustic phonons. The approach used to derive the generalized Drude relation with frequency and temperature dependent relaxation consists of defining the induced current density as a function of the electron-hole operator. This element is proportional to the perturbating electric field and is decomposed into the zeroth and second order of the electron-phonon interaction. The electron-hole operator is then evaluated using the Heisenberg equation. The connection between the electron-hole operator and the memory function is shown. The analytical properties of the imaginary and real part of the frequency and temperature dependent memory function, that describe electron scattering on acoustic and optical phonons, are examined in detail. Finally, the dynamical conductivity of Li(BN) 8 is calculated, with the explanation of all relevant features originating from the memory function.

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Section: Introductionmentioning

confidence: 99%

Dynamical conductivity of lithium-intercalated hexagonal boron nitride films: A memory function approach

Rukelj

2020

Phys. Rev. B

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“…[8][9][10] Consequently, h-BNNSs share many common properties with graphene, such as outstanding mechanical strength, good optical property, and high thermal conductivity. 11,12 However, h-BNNSs also have higher oxidation resistance and better chemical stability which are different from graphene, 13,14 making them promising in some harsh environment applications. Besides, the lamellar structure of h-BNNSs which is also entirely assembled by means of weak van der Waals forces is similar to those of graphene and molybdenum disulfide.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous production and functionalization of hexagonal boron nitride nanosheets by solvent-free mechanical exfoliation for superlubricant water-based lubricant additives

Chun

et al. 2019

npj 2D Mater Appl

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Hexagonal boron nitride nanosheets (h-BNNSs), with a crystal lattice structure similar to graphene by over 98%, exhibit good lubrication properties as lubricant additives. However, the poor dispersibility in solvents has limited their wide practical applications as lubricant additives. In the present report, water dispersible Pebax functionalized h-BNNSs (Pebax-BNNSs) have been prepared through a one-step solvent-free mechanical exfoliation process which relies on a simple exfoliation of h-BN layers by shearing force in molten Pebax at 200°C. In this process, Pebax molecules can synchronously react with the dangling bonds formed during the exfoliation process to achieve in situ functionalization of h-BNNSs. The reciprocating friction tests demonstrate that the as-obtained Pebax-BNNSs possess excellent antifriction and antiwear performance as water-based lubricant additive with a low concentration of 0.3 mg/mL under atmospheric condition. The friction coefficients can be <0.01, achieving superlubrication. Further systematical investigations on the wear traces, wear debris, and counter balls propose a "dispersion-compensation-filling repairment" friction mechanism. All these results demonstrate that h-BNNSs can achieve superlubrication as water-based lubricant additives via facile surface modification, making them very promising candidates as lubricant additives in practical applications.

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“…To calculate the ground-state electronic density we use a 21 × 21 × 1 Monkhorst-Pack K-point mesh [74] of the first BZ. For norm-conserving pseudopotentials and alkaline, alkalineearth, and lighter atoms in the III, IV, V, and VI columns of the periodic table (Al, C, S, P, O, B, …) the plane-wave cutoff energy of 50 Ry is a well-converged value for the ground-state band structure E nK and KS wave function φ * nK (r) calculations [33,[75][76][77]. For charge vertices (18) and then response function (17) calculations the plane-wave cutoff energy can be even reduced, in comparison with that used in the ground-state calculation, and the dielectric response calculation will still be well converged [33].…”

Section: A Computational Detailsmentioning

confidence: 99%

Wake potential in graphene-insulator-graphene composite systems

et al. 2019

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We study the wake potential produced by an external charged particle that moves parallel to various sy 1-Al 2 O 3-sy 2 sandwich-like composites, where the system sy i (with i = 1, 2) may be vacuum, pristine graphene, or doped graphene. The effective dielectric function of the composites is obtained using three complementary methods for graphene's electronic response, based on the massless Dirac fermions (MDF) method, the extended hydrodynamic (eHD) model, and the ab initio approach. Three velocity regimes are explored with respect to the threshold for excitations of the Dirac plasmon in graphene, given by its Fermi velocity v F. In the low-velocity regime (below v F), only the transverse optical (TO) phonons in the Al 2 O 3 layer contribute to the wake potential in the surface with sy 2 (which is nearest to the charged particle), in a manner that is only sensitive to the composition of that system: if sy 2 is vacuum, the TO phonons give rise to intense oscillations in the wake potential, which are strongly suppressed if sy 2 is pristine or doped graphene. For intermediate velocities (above v F), the hybridized plasmon-TO phonon modes on both surfaces contribute to the wake potential in the surface with sy 2 , with the most dominant contribution coming from the hybridized Dirac-like plasmonic modes. In the high-velocity regime (well above v F), the highest-lying hybridized Dirac plasmon gives the dominant contribution to the wake potential, which exhibits a typical V-shaped wave-front pattern that lags behind the charged particle. It is found that the MDF method agrees very well with the results of the ab initio method for small and intermediate velocities. However, in the high-velocity regime, the high-energy π plasmon in graphene introduces new features in the wake potential in the form of fast oscillations, just behind the charged particle. Those oscillations in the wake potential are well described by both the eHD and the ab initio method, proving that the π plasmon indeed behaves as a collective mode.

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Strong two-dimensional plasmon in Li-intercalated hexagonal boron-nitride film with low damping

Cited by 22 publications

References 65 publications

Dynamical conductivity of lithium-intercalated hexagonal boron nitride films: A memory function approach

Dynamical conductivity of lithium-intercalated hexagonal boron nitride films: A memory function approach

Simultaneous production and functionalization of hexagonal boron nitride nanosheets by solvent-free mechanical exfoliation for superlubricant water-based lubricant additives

Wake potential in graphene-insulator-graphene composite systems

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