From One Electron to One Hole: Quasiparticle Counting in Graphene Quantum Dots Determined by Electrochemical and Plasma Etching

Neubeck, S.; Пономаренко, Л. А.; Freitag, F.; Giesbers, A. J. M.; Zeitler, U.; Морозов, С. В.; Blake, P.; Geǐm, A. K.; Новоселов, К. С.

doi:10.1002/smll.201000291

Cited by 103 publications

(84 citation statements)

References 27 publications

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“…The majority of devices were fabricated by connecting graphene islands with narrow constrictions to graphene leads. 40,221,[242][243][244][245][246][247][248][249][250][251][252][254][255][256][257][258][259][260][261][262][263][264][265][266][267][268][269][270][271][272][273][276][277][278] Various designs also used gated regions: top gates on a single layer ribbon 253 and split gates on bilayer graphene. 61,234,274 Other designs used a single constriction as a quantum dot 240,241,275 or high resistive contacts.…”

Section: A Device Geometriesmentioning

confidence: 99%

“…61,234,274 Other designs used a single constriction as a quantum dot 240,241,275 or high resistive contacts. 279 Patterns were designed with the aim of fabricating single 40,61,234,[240][241][242][243][244][245][246][247][248][249]251,252,[258][259][260]263,[265][266][267][268]271,[274][275][276][277][278][279] or serial double quantum dots. 221,250,[253][254][255]257,261,262,264,267,269,270,…”

Section: A Device Geometriesmentioning

confidence: 99%

“…40,45,61,221,234,[275][276][277][278][279]) and one (see Refs. 251,256,and 271) or multiple (see Refs.…”

Section: A Device Geometriesmentioning

confidence: 99%

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Localized charge carriers in graphene nanodevices

Bischoff

Varlet

Simonet

et al. 2015

Applied Physics Reviews

100

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Graphene—two-dimensional carbon—is a material with unique mechanical, optical, chemical, and electronic properties. Its use in a wide range of applications was therefore suggested. From an electronic point of view, nanostructured graphene is of great interest due to the potential opening of a band gap, applications in quantum devices, and investigations of physical phenomena. Narrow graphene stripes called “nanoribbons” show clearly different electronical transport properties than micron-sized graphene devices. The conductivity is generally reduced and around the charge neutrality point, the conductance is nearly completely suppressed. While various mechanisms can lead to this observed suppression of conductance, disordered edges resulting in localized charge carriers are likely the main cause in a large number of experiments. Localized charge carriers manifest themselves in transport experiments by the appearance of Coulomb blockade diamonds. This review focuses on the mechanisms responsible for this charge localization, on interpreting the transport details, and on discussing the consequences for physics and applications. Effects such as multiple coupled sites of localized charge, cotunneling processes, and excited states are discussed. Also, different geometries of quantum devices are compared. Finally, an outlook is provided, where open questions are addressed.

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Section: A Device Geometriesmentioning

confidence: 99%

Section: A Device Geometriesmentioning

confidence: 99%

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Localized charge carriers in graphene nanodevices

Bischoff

Varlet

Simonet

et al. 2015

Applied Physics Reviews

100

View full text Add to dashboard Cite

show abstract

“…The modulation of the band gap of GQDs by various means has attracted great interest for potential applications. The band gap properties of GQDs are caused by quantum confinement effects [6][7][8]. In general, the band gap or the PL emission of GQDs can be modulated by their size and chemical functionalization.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Photoluminescence of Graphene Quantum Dots by Fluorination

Luo

et al. 2017

Journal of Nanomaterials

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Fluorinated graphene quantum dots (F-GQDs) were prepared by mixing GQDs and XeF 2 in a facile gaseous phase heating method. The F-GQDs with excellent water solubility have a F/C atomic ratio of 84.25% and a diameter of 2-6 nm. The photoluminescence (PL) properties of GQDs and F-GQDs were investigated systematically. The results showed that the PL emission of the F-GQDs exhibited an obvious blue-shift of 90 nm compared to that of the GQDs.

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“…The quantum confinement caused by reduced dimensionality of these structures opens a tunable bandgap 7,17 . Several studies have characterized the electronic properties of GNF 5,18-39 and some have shed light on their optical features [20][21][22][23][24]27,33,34,[40][41][42][43][44] .…”

Section: Introductionmentioning

confidence: 99%

Optical properties of graphene nanoflakes: Shape matters

Wettstein

Bonafé

Oviedo

et al. 2016

The Journal of Chemical Physics

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In recent years there has been significant debate on whether the edge type of graphene nanoflakes (GNFs) or graphene quantum dots (GQDs) are relevant for their electronic structure, thermal stability, and optical properties. Using computer simulations, we have proven that there is a fundamental difference in the absorption spectra between samples of the same shape, similar size but different edge type, namely, armchair or zigzag edges. These can be explained by the presence of electronic structures near the Fermi level which are localized on the edges. These features are also evident from the dependence of band gap on the GNF size, which shows three very distinct trends for different shapes and edge geometries.

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From One Electron to One Hole: Quasiparticle Counting in Graphene Quantum Dots Determined by Electrochemical and Plasma Etching

Cited by 103 publications

References 27 publications

Localized charge carriers in graphene nanodevices

Localized charge carriers in graphene nanodevices

Tuning the Photoluminescence of Graphene Quantum Dots by Fluorination

Optical properties of graphene nanoflakes: Shape matters

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