Electronic transport measurements in graphene nanoribbons. Introduction graphene nanoribbons, quasionedimensional structures of carbon, are fascinating materials. We demonstrate the possibility to tune the electronic transport properties of graphene monolayers and multilayers by functionalisation with fluorine. Transfer matrix approach to onedimensional electron transport in graphene sheets with piecewise constant potentials s. Rossi, electronic transport in two dimensional graphene, arxiv. Liquid gated three dimensional graphene network transistor liquid gated three dimensional graphene network transistor ameri, shideh kabiri.
Electron transport measurements on graphene,, are abundant precisely because they are easier to perform and reveal a wealth of information about the underlying electronic system. Here we report on our search for alternative substrates. At liquid helium temperatures near 4 k, transport experiments on graphene sheets of several microns in length and. Two dimensional graphenehbcn based devices with large.
Review modern physics electronic transport in twodimensional graphene. An alternative way to understand the quantum hall effect is to study edge transport. Electron transport in two dimensional materials by kyunghoon lee a dissertation submitted in partial fulfillment of the requirements for the degree of doctor of philosophy electrical engineering in the university of michigan 2015 doctoral committee. Electronic transport in graphenebased heterostructures. The discovery of unusual heat conduction properties of graphene has led to a surge of theoretical and experimental studies of phonon transport in twodimensional material systems. Although these systems share a similar underlying electronic structure, whose exact details depend on confinement effects, crucial differences.
Electronic transport in two dimensional graphene s. The rapidly developing graphene thermal field spans from theoretical physics to practical engineering applications. With its rst experimental discovery in 2004, graphene takes its place as the twodimensional member in the family of graphitic carbon allotropes. From these calculations, the effective masses and velocities of the carriers have been estimated, and compared with available experimental measurements, for each of these structures. Transport properties of graphene with onedimensional.
Offprint transport properties of graphene with onedimensional charge defects aires ferreira, xiangfan xu, changlin tan, sukang bae, n. Twodimensional peculiarities of phonon transport in graphene translate into extremely high values of phonon thermal conductivity, large average phonon mean free path and unusually strong dependence of the thermal conductivity on. Theory of quantum transport in twodimensional graphite 3 fig. However, it is crucial to modify the semimetallic electronic structure of graphene to exploit its full potential for many electronic. For monolayer samples, with increasing the fluorine content, we observe a transition from electronic transport through mott variable range hopping vrh in two dimensions to efrosshklovskii vrh. Theory for electron transport in graphene sciencedirect. In this way we can pattern nanoribbons, rings, as well as other nanostructures. Hwang, and enrico rossi1 1condensed matter theory center, department of physics, university of maryland, college park, md 207424111 2center for nanoscale science and technology, national institute of standards and technology. Twodimensional graphenebased transistors with high ionio. In this letter, we study the surface morphology of 2d bn, gallium selenide gase, and transition metal dichalcogenides tungsten disulfide. Electrical noise and transport properties of graphene. Ruoff,7 vittorio pellegrini1,6 graphene and related twodimensional crystals and hybrid systems showcase several key. Electronic transport in two dimensional graphene request pdf.
An effective route to tuning the thermal transport properties of graphene bingyang cao, wenjun yao, zhenqiang ye key laboratory for thermal science and power engineering of ministry of education, department of engineering mechanics, tsinghua university, beijing. Our study reveals a variety of unusual phenomena that are characteristic of twodimensional dirac fermions. Dimensional crossover of thermal transport in fewlayer. Various methods have been developed for patterning graphene sheets into prototype devices such as quantum. Especially in future electronic devices compatible with and extending silicon technology, due to the outstanding electronic transport properties of graphene. While significant exploratory research in 2d materials has been achieved, the understanding of 2d electronic transport and carrier dynamics remains in a nascent stage. Ghazanfari physics department, islamic azad university arsf science and research branch. Carrier transport in twodimensional graphene layers. While boron nitride bn substrates have been utilized to achieve high electronic mobilities in graphene field effect transistors, it is unclear how other layered two dimensional 2d crystals influence the electronic performance of graphene. Twodimensional graphene, carbon nanotubes, and graphene nanoribbons represent a novel class of low dimensional materials that could serve as building blocks for future carbonbased nanoelectronics. Transfer matrix approach to onedimensional electron. The study is performed by means of a multiscale approach leveraging abinitio simulations to capture the physics at the atomic scale, and tightbinding simulations to compute transport.
The 2016 gordon conference on two dimensional electronics beyond graphene will present cuttingedge research addressing the fundamental properties and potential uses of ultrathin layered systems with a fundamental band gap including transition metal dichalcogenides, group v systems including phosphorene, and related isoelectronic structures. The devices fabricated by encapsulating graphene with molybdenum or tungsten. Twodimensional gas of massless dirac fermions in graphene. Nanostructures based on graphene have an enormous potential for applications. Review 2d materials graphene, related twodimensional crystals, and hybrid systems for energyconversion and storage francesco bonaccorso,1,2 luigi colombo,3 guihua yu,4 meryl stoller,5 valentina tozzini,6 andrea c. Hexagonal boron nitride is the only substrate that has so far allowed graphene devices exhibiting micrometerscale ballistic transport. The transistor is made of graphene foam, which is a complex three. A comparison of neutral and charged species of one and. Indeed, even when the bulk of the graphene sheet is in a gapped quantum hall phase, charge carriers can still propagate in one dimensional channels along the edges of the sample. Pdf electronic transport in two dimensional graphene. A comparison of neutral and charged species of one and twodimensional models of graphene nanoribbons using multireference theory. Thermal transport in solids is described by thermal conductivity k through the empirical fourier law, which states that j q dkrt, where the heat flux j q is the amount of heat. Geometric influence on electrical and magneto transport properties has been investigated in three types of systems.
Comprehensive overview of electronic transport in graphene. An attempt has been made to explain the gradual change in the electronic properties from the twodimensional. Theory of quantum transport in twodimensional graphite. The electronic properties of graphene nanoribbons, however, in general di er from those of a 2d sheet due to a nanoribbons nite width. Tuning the electronic transport properties of graphene. Graphene with antidots, twodimensional electron gas and threedimensional carbon nanostructures by lei wang bachelor of science shandong university of science and technology, 2008 master of science chinese academy of sciences, 2011 submitted in partial fulfillment of the requirements. Thermal transport in graphene, fewlayer graphene and. Two dimensional 2d materials have captured the attention of the scientific community due to the wide range of unique properties at nanometerscale thicknesses. Pdf electronic transport in twodimensional graphene.
Electronic and transport properties of kinked graphene. Dorgan dissertation submitted in partial fulfillment of the requirements for the degree of doctor of philosophy in electrical and computer engineering in the graduate college of the university of illinois at urbanachampaign, 2014 urbana, illinois. Iannaccone dipartimento di ingegneria dellinformazione. Energy bands of a metallic carbon nanotube with circumference l. The metallic nature of graphene 1,2 differs from that of two dimensional 2d nanostructures based on transition metal dichalcogenide tmd layer materials, such as mos 2, ws 2, and res 2. The energy dispersion and density of states in the vicinity of k and k points obtained in a kp scheme. Graphene is the latest sensation with unusual properties, such as halfinteger quantum hall effect and ballistic electron transport. This result is a consequence of the twodimensional nature of phonons in graphene, and provides fundamental understanding of thermal transport in twodimensional materials. This twodimensional material which is the parent of all graphitic carbon forms is strictly expected to comprise a single layer, but there is considerable interest in investigating twolayer and fewlayer. We present a performance assessment of graphenehexagonal boron nitride heterojunctions based transistors able to provide large current modulation. Liquid gated three dimensional graphene network transistor. Electronic and transport properties of defected graphene. Twodimensional thermal transport in graphene sciencedirect.
Twodimensional electronic transport and surface electron. Electronic and transport properties of defected graphene nanoribbons narjes gorjizadeh 1, yoshiyuki kawazoe 1 and amir a. Farajian 2 1tohoku university, 2wright state university, 1japan 2u. Electronic properties of graphene encapsulated with.
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