Tunable periodic graphene antidot lattices fabricated by e-beam lithography and oxygen ion etching

Liu, L.Z.; Tian, Shuang; Long, Yun; Li, W.X.; Yang, He; Li, J.J.; Gu, Changzhi

doi:10.1016/j.vacuum.2014.01.015

Cited by 31 publications

(25 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1c, which have the Dirac cone located at K (K′) point due to the sublattice equivalence. The recent advances of nanotechnologies [28][29][30][31] show the feasibilities of regularly arranging antidots in silicene sheet, making silicene nanomesh. This would impose new Born-von Karman boundary conditions to form silicene superlattice [32][33][34] .…”

Section: Energy Band Folding and Bandgap Openingmentioning

confidence: 99%

“…Hence, it would be interesting if the bandgap could be switched on/off for a specific silicene-based nanomaterial toward different application demands. Recently, many experimental studies reported the synthesis of 2D nanomeshes by using nanotechnologies [28][29][30][31] .…”

Section: Introductionmentioning

confidence: 99%

“…Kim et al 30 also successfully nanoperforated the nanomesh by using the cylinder-forming diblock copolymer templates. A method combining the e-beam lithography and the oxygen reactive ion etching was proved efficiently in making tunable periodic superlattices 31 . These studies shed light on the feasibility in producing superlattice structures with nice precision in fabricating regular patterns.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Band Gap on/off Switching of Silicene Superlattice

et al. 2015

View full text Add to dashboard Cite

On the basis of density functional theory calculations with generalized gradient approximation, we have investigated in detail the cooperative effects of uniaxial strain and degenerate perturbation on manipulating bandgap in silicene. The uniaxial strain would split π bands into π a and π z bands making Dirac cone to move. Then, the hexagonal antidot would split π a (π z ) bands into π a1 and π a2 (π z1 and π z2 ) bands accounting for the bandgap opening in the superlattices with Dirac cone being folded to Γ point, which is a different mechanism as compared to the sublattice equivalence breaking. The energy interval between the split π a and π z bands could be tuned to switch bandgap on/off, suggesting a reversible switch between the high charge carrier velocity properties of massless Fermions attributed to linear energy dispersion relation around Dirac point and the high on/off properties associated with sizable bandgap. Even more, the gap width could be continuously tuned by manipulating strain, showing fascinating application potentials.

show abstract

Section: Energy Band Folding and Bandgap Openingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Band Gap on/off Switching of Silicene Superlattice

et al. 2015

View full text Add to dashboard Cite

show abstract

“…GNM displays promising advantages relative to existing graphene. Some techniques have been developed to fabricate and operate such nanomesh lattices, for example, electron-beam irradiation etching, 18 oxygen reactive ion etching, 19 atomic force microscopy etching, 20 laser shock, 21 block copolymer lithography, 14,22 nanoimprint lithography, 23 and nanosphere lithography. 24 These experimental progresses in fabricating GNM shed light on the feasibility of GNM applied in nanodevices.…”

Section: Introductionmentioning

confidence: 99%

The effect of different hydrogen terminations on the structural and electronic properties in the triangular array graphene nanomeshes

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Secondly, graphene is amiable to nano structuring [5][6][7]. One idea is to introduce a regular array of holes, also known as antidot lattice, into graphene, with the remaining body dubbed as graphene nanomesh [8][9][10][11][12][13][14][15][16]. Depending on the hole alignment, the band structure of superstructured graphene can be either gapless or gapped, and in gapped cases the gap size is tunable [8,9,[17][18][19][20][21][22][23][24][25].Historically, gap introduction in a honeycomb lattice model, or mass attachment to emergent relativistic electrons, has been cornerstones in discovering new topological phases of matter.…”

mentioning

confidence: 99%

Counterpropagating topological interface states in graphene patchwork structures with regular arrays of nanoholes

et al. 2018

View full text Add to dashboard Cite

Triangular and honeycomb lattices are dual to each other -if we puncture holes into a featureless plane in a regular triangular alignment, the remaining body looks like a honeycomb lattice, and vice versa, if the holes are in a regular honeycomb alignment, the remaining body has a feature of triangular lattice. In this work, we reveal that the electronic states in graphene sheets with nanosized holes in triangular and honeycomb alignments are also dual to each other in a topological sense. Namely, a regular hole array perforated in graphene can open a band gap in the energymomentum dispersion of relativistic electrons in the pristine graphene, and the insulating states induced by triangular and honeycomb hole arrays are distinct in topology. In a graphene patchwork with regions of these two hole arrays put side by side counterpropagating topological currents emerge at the domain wall. This observation indicates that the cerebrated atomically thin sheet is where topological physics and nanotechnology meet.Electrons behave as waves in microscopic world, and a regular array of scattering centers causes quantum interference, i.e., Bragg reflection, which governs the electron propagation in terms of energy and momentum. This explains band gaps and band insulators in crystals where ions are regularly aligned. The same principle is effective even if we zoom out a little bit: starting from Bloch waves, with which angstrom-scale structures of the underlying crystal are already taken into account, superstructures in micro-or meso-scopic scales can induce new band gaps and modify the electron propagation. The first example is the superlattice invented by Leo Esaki in order to control properties of semiconductors [1].In this regard, graphene -mono atomic sheet of carbon atoms in honeycomb structure [2] -is a promising playground. First, the honeycomb array of scattering centers is responsible for the most striking feature of graphene, emergent relativistic fermion [3,4] appearing as an isolated gap closing point associated with linear dispersion (Dirac cone) in the band structure. Secondly, graphene is amiable to nano structuring [5][6][7]. One idea is to introduce a regular array of holes, also known as antidot lattice, into graphene, with the remaining body dubbed as graphene nanomesh [8][9][10][11][12][13][14][15][16]. Depending on the hole alignment, the band structure of superstructured graphene can be either gapless or gapped, and in gapped cases the gap size is tunable [8,9,[17][18][19][20][21][22][23][24][25].Historically, gap introduction in a honeycomb lattice model, or mass attachment to emergent relativistic electrons, has been cornerstones in discovering new topological phases of matter. For instance, with an appropriate time reversal symmetry (TRS) breaking term, the honeycomb lattice model can derive the quantum anomalous Hall state [26], which is a typical topological state characterized by the Chern number [27]. When the spinorbit coupling (SOC) is considered in a honeycomb lattice model, one obtains the qua...

show abstract

Tunable periodic graphene antidot lattices fabricated by e-beam lithography and oxygen ion etching

Cited by 31 publications

References 25 publications

Band Gap on/off Switching of Silicene Superlattice

Band Gap on/off Switching of Silicene Superlattice

The effect of different hydrogen terminations on the structural and electronic properties in the triangular array graphene nanomeshes

Counterpropagating topological interface states in graphene patchwork structures with regular arrays of nanoholes

Contact Info

Product

Resources

About