Silicene: Recent theoretical advances

Voon, L. C. Lew Yan; Zhu, Jiajie; Schwingenschlögl, Udo

doi:10.1063/1.4944631

Cited by 102 publications

(52 citation statements)

References 184 publications

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“…20 Theoretical studies have predicted that both silicene and germanene exhibit linear band dispersions near the Fermi level similar to graphene. 21,22 During the large-area synthesis of these two-dimensional materials, as-grown structural defects are often the first concern in the context of their practical applications. In addition, structural defects in two-dimensional materials can also be produced during the materials processing (e.g., heavy ion bombardment, high-energy electron irradiation and cold plasma treatment).…”

Section: Introductionmentioning

confidence: 99%

Electronic and magnetic properties of graphene, silicene and germanene with varying vacancy concentration

Ali

Liu

et al. 2017

AIP Advances

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The experimental realization of two-dimensional materials such as graphene, silicene and germanene has attracted incredible interest ranging from understanding their physical properties to device applications. During the fabrication and processing of these two-dimensional materials, structural defects such as vacancies may be produced. In this work we have systemically investigated the formation energies, electronic and magnetic properties of graphene, silicene and germanene with vacancies in the framework of spin polarized density functional theory. It is found that the magnetic moment of graphene and silicene with vacancies decreases with the increase in the concentration of vacancies. However, germanene remains non-magnetic irrespective of the vacancy concentration. Low-buckled silicene and germanene with vacancies may possess remarkable band gaps, in contrast to planar graphene with vacancies. With the formation of vacancies silicene and germanene demonstrate a transition from semimetal to semiconductor, while graphene turns to be metallic.

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Section: Introductionmentioning

confidence: 99%

Electronic and magnetic properties of graphene, silicene and germanene with varying vacancy concentration

Ali

Liu

et al. 2017

AIP Advances

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“…In this respect, we need to numerically calculate Eq. (5). Note that, for T > 0, the effect of temperature on the chemical potential, µ, must be taken into account.…”

Section: Resultsmentioning

confidence: 99%

A theoretical study of collective plasmonic excitations in double-layer silicene at finite temperature

Dadkhah

Vazifehshenas

Farmanbar

et al. 2019

Journal of Applied Physics

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We explore the temperature-dependent plasmonic modes of an n-doped double-layer silicene system which is composed of two spatially separated single layers of silicene with a distance large enough to prevent the interlayer electron tunneling. By applying an externally applied electric field, we numerically obtain the poles of the loss function within the so-called random phase approximation, to investigate the effects of temperature and geometry on the plasmon branches in three different regimes: topological insulator, valley-spin polarized metal, and band insulator. Also, we present the finite-temperature numerical results along with the zero-temperature analytical ones to support a discussion of the distinct effects of the external electric field and temperature on the plasmon dispersion. Our results show that at zero temperature both the acoustic and optical modes decrease by increasing the applied electric field and experience a discontinuity at the valley-spin polarized metal phase as the system transitions from a topological insulator to a band insulator. At finite temperature, the optical plasmons are damped around this discontinuity and the acoustic modes may exhibit a continuous transition. Moreover, while the optical branch of plasmons changes nonmonotonically and noticeably with temperature, the acoustic branch dispersion displays a negligible growth with temperature for all phases of silicene. Furthermore, our finite-temperature results indicate that the dependency of two plasmonic branches on the interlayer separation is not affected by temperature at long wavelengths; the acoustic mode energy varies slightly with increasing the interlayer distance, whereas the optical mode remains unchanged. arXiv:1811.12792v1 [cond-mat.mes-hall] 30 Nov 2018

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“…But near the so-called Dirac point, where valence and conduction bands meet, the electronic band structure is linear, just as it is in graphene. 12 Because no double bonds exist in the lattice and Si remains tetrahedrally coordinated, the Si atoms must be "functionalized," or bonded to some other molecule or lattice. To date, no one has experimentally synthesized free-standing silicene.…”

Section: Honeycomb Siliconmentioning

confidence: 99%