Evidence of graphene-like electronic signature in silicene nanoribbons

Padova, Paola De; Quaresima, C.; Ottaviani, Carlo; Sheverdyaeva, P. M.; Moras, Paolo; Carbone, C.; Topwal, D.; Olivieri, Bruno; Kara, Abdelkader; Oughaddou, Hamid; Aufray, B.; Lay, G. Le

doi:10.1063/1.3459143

Cited by 592 publications

(476 citation statements)

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“…The metastable lattice that we find is the same as the "low-buckled" structure found by Cahangirov et al 3 The experimental results for the lattice parameter depend on the choice of substrate on which the silicene is grown. 5,6 The extent to which theoretical results obtained for freestanding silicene are applicable to the silicene samples that have been produced to date is therefore unclear.…”

Section: A Comparison With Theoretical and Experimental Results In Tmentioning

confidence: 99%

“…1,2 A close relative of graphene, a 2D honeycomb lattice of Si atoms called silicene, 3 does not occur in nature, but nanoribbons of silicene have been synthesized on metal surfaces. [4][5][6] Due to the similarity of the lattice structures, the band structure of silicene resembles that of graphene, featuring Dirac-type electron dispersion in the vicinity of the corners of its hexagonal Brillouin zone (BZ). 7 Moreover, silicene has been shown theoretically to be metastable as a freestanding 2D crystal, 3 implying that it is possible to transfer silicene onto an insulating substrate and gate it electrically.…”

Section: Introductionmentioning

confidence: 99%

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Electrically tunable band gap in silicene

2012

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We report calculations of the electronic structure of silicene and the stability of its weakly buckled honeycomb lattice in an external electric field oriented perpendicular to the monolayer of Si atoms. The electric field produces a tunable band gap in the Dirac-type electronic spectrum, the gap being suppressed by a factor of about eight by the high polarizability of the system. At low electric fields, the interplay between this tunable band gap, which is specific to electrons on a honeycomb lattice, and the Kane-Mele spin-orbit coupling induces a transition from a topological to a band insulator, whereas at much higher electric fields silicene becomes a semimetal.

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Section: A Comparison With Theoretical and Experimental Results In Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrically tunable band gap in silicene

2012

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“…[39][40][41][42] Most recently, possibility of various combinations of MX 2 type single-layer transitionmetal oxides and dichalcogenides, stable even in freestanding form, was also predicted. 43 The recent synthesis of silicene, [44][45][46] the silicon analogue of graphene has opened a new avenue to nanoscale material research. Though the nanotube 47 and fullerene 48 forms of silicon were synthesized earlier, monolayer silicon was presumed not to exist in a freestanding form.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of alkali, alkaline-earth, and 3dtransition metal atoms on silicene

2013

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The adsorption characteristics of alkali, alkaline earth and transition metal adatoms on silicene, a graphene-like monolayer structure of silicon, are analyzed by means of first-principles calculations. In contrast to graphene, interaction between the metal atoms and the silicene surface is quite strong due to its highly reactive buckled hexagonal structure. In addition to structural properties, we also calculate the electronic band dispersion, net magnetic moment, charge transfer, workfunction and dipole moment of the metal adsorbed silicene sheets. Alkali metals, Li, Na and K, adsorb to hollow site without any lattice distortion. As a consequence of the significant charge transfer from alkalis to silicene metalization of silicene takes place. Trends directly related to atomic size, adsorption height, workfunction and dipole moment of the silicene/alkali adatom system are also revealed. We found that the adsorption of alkaline earth metals on silicene are entirely different from their adsorption on graphene. The adsorption of Be, Mg and Ca turns silicene into a narrow gap semiconductor. Adsorption characteristics of eight transition metals Ti, V, Cr, Mn, Fe, Co, Mo and W are also investigated. As a result of their partially occupied d orbital, transition metals show diverse structural, electronic and magnetic properties. Upon the adsorption of transition metals, depending on the adatom type and atomic radius, the system can exhibit metal, half-metal and semiconducting behavior. For all metal adsorbates the direction of the charge transfer is from adsorbate to silicene, because of its high surface reactivity. Our results indicate that the reactive crystal structure of silicene provides a rich playground for functionalization at nanoscale.

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“…7,10 We have shown that their reactivity towards molecular oxygen is substantially less than that of silicon. 11 In addition, angle-resolved photoelectron spectroscopy (ARPES) measurements showed quantum confined electronic states of a onedimensional character 12 with a dispersion along the length of the NRs, in the vicinity of the X-point of the Brillouin zone suggesting a behavior analogous to the Dirac cones of graphene. 12 On the Ag(111) surface, a continuous two dimensional (2D) sheet of silicene presenting a (2√3x2√3) R30° superstructure, has been observed by scanning tunneling microscopy (STM).…”

mentioning

confidence: 99%

“…11 In addition, angle-resolved photoelectron spectroscopy (ARPES) measurements showed quantum confined electronic states of a onedimensional character 12 with a dispersion along the length of the NRs, in the vicinity of the X-point of the Brillouin zone suggesting a behavior analogous to the Dirac cones of graphene. 12 On the Ag(111) surface, a continuous two dimensional (2D) sheet of silicene presenting a (2√3x2√3) R30° superstructure, has been observed by scanning tunneling microscopy (STM). 9 Following our pioneering work, several groups have successfully grown silicene on Ag(111) and reported the existence of different ordered phases 13-16 (2√3x2√3) R30°, (4x4), and (√13x√13) R13.9°.…”

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Combined AFM and STM measurements of a silicene sheet grown on the Ag(111) surface

Majzik

Tchalala

Švec

et al. 2013

J. Phys.: Condens. Matter

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In this Letter, we present the first non-contact atomic force microscopy (nc-AFM) of a silicene on silver (Ag) surface, obtained by combining non-contact atomic force microscopy (nc-AFM) and scanning tunneling microscopy (STM). STM images over large areas of silicene grown on Ag(111) surface show both (√13x√13)R13.9° and (4x4) superstructures.For the widely observed (4x4) structure, the nc-AFM topography shows an atomic-scale contrast inversion as the tip-surface distance is decreased. At the shortest tip-surface distance, the nc-AFM topography is very similar to the STM one. The observed structure in the nc-AFM topography is compatible with only one out of two silicon atoms being visible. This indicates unambiguously a strong buckling of the silicene honeycomb layer.

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Evidence of graphene-like electronic signature in silicene nanoribbons

Cited by 592 publications

References 16 publications

Electrically tunable band gap in silicene

Electrically tunable band gap in silicene

Adsorption of alkali, alkaline-earth, and 3dtransition metal atoms on silicene

Combined AFM and STM measurements of a silicene sheet grown on the Ag(111) surface

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