Local gating of decoupled graphene monolayers

Lüdtke, T.; Schmidt, Hennrik; Barthold, P.; Haug, Rolf J.

doi:10.1016/j.physe.2009.11.130

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…The proportionally corresponding evolution of top and bottom layers' charge carrier concentration is described via a screening model based on a parallel plate capacitor and in account of the small (and energy‐dependent) DOS in the individual monolayer dispersions . The degree of experimental control has since been improved by additional application of a top‐gate; the descriptive screening model may be further refined, e.g. in accounting for reduction of Fermi velocities as described in the following.…”

Section: Electronic Properties and Magnetotransportmentioning

confidence: 99%

Twisted Bilayer Graphene: Interlayer Configuration and Magnetotransport Signatures

Rode¹,

Смирнов²,

Belke³

et al. 2017

Annalen der Physik

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Twisted Bilayer Graphene may be viewed as very first representative of the now booming class of artificially layered 2D materials. Consisting of two sheets from the same structure and atomic composition, its decisive degree of freedom lies in the rotation between crystallographic axes in the individual graphene monolayers. Geometrical consideration finds angle-dependent Moiré patterns as well as commensurate superlattices of opposite sublattice exchange symmetry. Beyond the approach of rigidly interposed lattices, this review takes focus on the evolving topic of lattice corrugation and distortion in response to spatially varying lattice registry. The experimental approach to twisted bilayers requires a basic control over preparation techniques; important methods are summarized and extended on in the case of bilayers folded from monolayer graphene via AFM nanomachining. Central morphological parameters to the twisted bilayer, rotational mismatch and interlayer separation are studied in a broader base of samples. Finally, experimental evidence for a number of theoretically predicted, controversial electronic scenarios are reviewed; magnetotransport signatures are discussed in terms of Fermi velocity, van Hove singularities and Berry phase and assessed with respect to the underlying experimental conditions, thereby referring back to the initially considered variations in relaxed lattice structure.

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Section: Electronic Properties and Magnetotransportmentioning

confidence: 99%

Twisted Bilayer Graphene: Interlayer Configuration and Magnetotransport Signatures

Rode¹,

Смирнов²,

Belke³

et al. 2017

Annalen der Physik

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“…In the third step, another layer of polymethylmethacrylate (PMMA) was deposited on top of the flake to enable the fabrication of a topgate (TG) using the PMMA as an insulator. [19][20][21] The chromium/gold topgate was evaporated over one arm of the ring (see Fig. 1(b)).…”

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confidence: 99%

Aharonov-Bohm effect in an electron-hole graphene ring system

Смирнов

Schmidt

Haug

2012

Applied Physics Letters

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Aharonov-Bohm oscillations are observed in a graphene quantum ring with a top gate covering one arm of the ring. As graphene is a gapless semiconductor this geometry allows to study not only the quantum interference of electrons with electrons or holes with holes but also the unique situation of quantum interference between electrons and holes. The period and amplitude of the observed Aharonov-Bohm oscillations are independent of the sign of the applied gate voltage showing the equivalence between unipolar and dipolar interference.Comment: 4 pages, 3 figure

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“…However, recent investigations, based on a detailed treatment of the screened Coulomb interaction [28][29][30]54,55 and on a consideration of a multi-band pairing 31,54 or pairing with nonzero momentum 56 suggest that the transition temperature T c can be sufficiently big for the experimental observation of the excitonic insulator in the considered system. Together with recent experimental realization of the two-layer graphene system [32][33][34][35][36][37] it provides a hope that the phase diagram of the excitonic insulator, Fig. 1(b), under favorable conditions 57-60 will be observed experimentally.…”

Section: Resultsmentioning

confidence: 88%

“…Recently the two-layer graphene system has been obtained experimentally. [32][33][34][35][36][37] In this paper, we extend the existing theory of the excitonic insulator state in a two-layer graphene system: we analyze a symmetry of the excitonic insulator and classify its phases. As a result a phase diagram of the excitonic insulator is built, that takes into account the effect of the symmetry breaking due to the Zeeman splitting and the asymmetry between electron/hole densities in the layer 1 and 2.…”

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confidence: 99%

Phases of the excitonic condensate in two-layer graphene

2012

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Two graphene monolayers that are oppositely charged and placed close to each other are considered. Taking into account valley and spin degeneracy of electrons we analyze the symmetry of the excitonic insulator states in such a system and build a phase diagram that takes into account the effect of the symmetry breaking due to the external in-plane magnetic field and the carrier density imbalance between the layers.

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Local gating of decoupled graphene monolayers

Cited by 4 publications

References 22 publications

Twisted Bilayer Graphene: Interlayer Configuration and Magnetotransport Signatures

Twisted Bilayer Graphene: Interlayer Configuration and Magnetotransport Signatures

Aharonov-Bohm effect in an electron-hole graphene ring system

Phases of the excitonic condensate in two-layer graphene

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