Dirac Cones and Minigaps for Graphene on Ir(111)

Pletikosić, Ivo; Kralj, Marko; Pervan, Petar; Brako, R.; Coraux, Johann; N’Diaye, Alpha T.; Busse, Carsten; Michely, Thomas

doi:10.1103/physrevlett.102.056808

Cited by 574 publications

(691 citation statements)

References 33 publications

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“…2(a), electronic structure of the MG/Pt/Ir(111) system is characterized by the pronounced branch of the π state of graphene, which has the binding The most pronounced replica marked as "R" reaches a BE of 0.8 eV at k = 1.4Å −1 . It has been shown [33,34], that the main branch of the π state exhibits minigaps, opened in regions of the intersections with the replicated bands. For the MG/Ir(111) the intersection between the main branch and the replica of the π state in the¯ K direction takes place at the BE of 1 eV, and the width of the minigap was established around 0.23 eV [34].…”

Section: Resultsmentioning

confidence: 99%

Variation of the character of spin-orbit interaction by Pt intercalation underneath graphene on Ir(111)

et al. 2015

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The modification of the graphene spin structure is of interest for novel possibilities of application of graphene in spintronics. The most exciting of them demand not only high value of spin-orbit splitting of the graphene states, but non-Rashba behavior of the splitting and spatial modulation of the spin-orbit interaction. In this work we study the spin and electronic structure of graphene on Ir(111) with intercalated Pt monolayer. Pt interlayer does not change the 9.3 × 9.3 superlattice of graphene, while the spin structure of the Dirac cone becomes modified. It is shown that the Rashba splitting of the π state is reduced, while hybridization of the graphene and substrate states leads to a spin-dependent avoided-crossing effect near the Fermi level. Such a variation of spin-orbit interaction combined with the superlattice effects can induce a topological phase in graphene.

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Section: Resultsmentioning

confidence: 99%

Variation of the character of spin-orbit interaction by Pt intercalation underneath graphene on Ir(111)

et al. 2015

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“…In other words, we only need to include the G = 0 components in Eq. (6). This means that for the systems considered herein, LFEs in the graphene plane may be neglected.…”

Section: Methodsmentioning

confidence: 99%

“…Graphene is a very simple, strong, and easily synthesized material, [1][2][3][4][5][6] which makes it interesting for many practical applications, [7][8][9][10] culminating in the award of a Nobel prize in 2011. 11,12 For example, bilayer and monolayer graphene on substrates 13 have become promising materials for both nanoelectronics 14 and optoelectronics.…”

Section: Introductionmentioning

confidence: 99%

TDDFT study of time-dependent and static screening in graphene

et al. 2012

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Time-dependent density functional theory (TDDFT) within the random phase approximation (RPA) is used to obtain the time evolution of the induced potential produce by the sudden formation of a C 1s core hole inside a graphene monolayer, and to show how the system reaches the equilibrium potential. The characteristic oscillations in the time-dependent screening potential are related to the excitations of π and σ + π plasmons as well as the low energy 2D plasmons in doped graphene. The equilibrium RPA screened potential is compared with the DFT effective potential, yielding good qualitative agreement. The self energy of a point charge near a graphene monolayer is shown to demonstrate an image potential type behavior, Ze/(z − z 0 ), down to very short distances (4 a.u.) above the graphene layer. Both results are found to agree near quantitatively with the DFT ground state energy shift of a Li + ion placed near a graphene monolayer.

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“…Moreover, electrons from the metal substrate can interact with π electrons in graphene, resulting in charge transfer, strong electron-phonon scattering, band hybridization and in some cases even the absence of Dirac cone [5][6][7] . Even on the most weakly interacting substrate like Ir(111), clear distortion of the graphene dispersion has also been reported 8 . The interaction between graphene and the metal substrate is therefore a major obstacle that needs to be overcome for investigating the fundamental physics of pristine graphene and for realizing its potential applications.…”

Section: Introductionmentioning

confidence: 99%

Monolayer charge-neutral graphene on platinum with extremely weak electron-phonon coupling

et al. 2015

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Epitaxial growth of graphene on transition metal substrates is an important route for obtaining large scale graphene. However, the interaction between graphene and the substrate often leads to multiple orientations, distorted graphene band structure, large doping and strong electron-phonon coupling. Here we report the growth of monolayer graphene with high crystalline quality on Pt(111) substrate by using very low concentration of internal carbon source with high annealing temperature. The controlled growth leads to electronically decoupled graphene: it is nearly charge neutral and has extremely weak electron-phonon coupling (coupling strength λ ≈ 0.056) as revealed by angle-resolved photoemission spectroscopic measurements. The thermodynamics and kinetics of carbon diffusion process is investigated by DFT calculation. Such graphene with negligible graphene-substrate interaction provides an important platform for fundamental research as well as device applications when combined with nondestructive sample transfer technique.

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Dirac Cones and Minigaps for Graphene on Ir(111)

Cited by 574 publications

References 33 publications

Variation of the character of spin-orbit interaction by Pt intercalation underneath graphene on Ir(111)

Variation of the character of spin-orbit interaction by Pt intercalation underneath graphene on Ir(111)

TDDFT study of time-dependent and static screening in graphene

Monolayer charge-neutral graphene on platinum with extremely weak electron-phonon coupling

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