Imaging and Tuning Molecular Levels at the Surface of a Gated
... Figure S2: DFT calculated LDOS for (a) LUMO for CVB/graphene, (b) LUMO+1 for CVB/graphene, (c) LUMO for a free-standing CVB layer, (d) LUMO+1 for a free-standing CVB layer, (e) LUMO for an isolated free-standing CVB molecule, and (f) LUMO+1 for an isolated free-standing CVB molecule. In order to ca ...
... Figure S2: DFT calculated LDOS for (a) LUMO for CVB/graphene, (b) LUMO+1 for CVB/graphene, (c) LUMO for a free-standing CVB layer, (d) LUMO+1 for a free-standing CVB layer, (e) LUMO for an isolated free-standing CVB molecule, and (f) LUMO+1 for an isolated free-standing CVB molecule. In order to ca ...
Two-Dimensional Schrodinger Scattering and Electron Transport in Graphene
... at least, two-dimensional graphite has been studied since the late 1940s and is widely used for describing properties of various carbon-based materials. An interesting property of Graphene is that the charge carriers are relativistic. Even though they are not actually travelling at relativistic spee ...
... at least, two-dimensional graphite has been studied since the late 1940s and is widely used for describing properties of various carbon-based materials. An interesting property of Graphene is that the charge carriers are relativistic. Even though they are not actually travelling at relativistic spee ...
TiO2-graphene oxide nanocomposite as advanced photocatalytic
... been well documented that GO is heavily oxygenated graphene that is readily exfoliated in water to yield stable dispersions consisting mostly of single-layer sheets. The use of graphene oxide as the nanoscale substrates for the formation of nonocomposites with metal oxides is widely explored due to ...
... been well documented that GO is heavily oxygenated graphene that is readily exfoliated in water to yield stable dispersions consisting mostly of single-layer sheets. The use of graphene oxide as the nanoscale substrates for the formation of nonocomposites with metal oxides is widely explored due to ...
Electron Thermionic Emission from Graphene and a Thermionic
... (log-log scale) for various Φ ¼ 3, 4, and 5 eV (solid lines) at fixed EF ¼ 0.083 eV, and vf ¼ 106 m=s. The results based on the RD law are also presented (dashed lines) for comparison. Here, we assume that the work function does not change with the temperature. For a given work function, a scaling o ...
... (log-log scale) for various Φ ¼ 3, 4, and 5 eV (solid lines) at fixed EF ¼ 0.083 eV, and vf ¼ 106 m=s. The results based on the RD law are also presented (dashed lines) for comparison. Here, we assume that the work function does not change with the temperature. For a given work function, a scaling o ...
Graphene and Relativistic Quantum Physics
... Since this first demonstration of experimental production of an isolated single atomic layer of graphene sample, numerous unique electrical, chemical, and mechanical properties of graphene have been investigated. In particular, an unusual half-integer quantum Hall effect (QHE) and a non-zero Berry’s ...
... Since this first demonstration of experimental production of an isolated single atomic layer of graphene sample, numerous unique electrical, chemical, and mechanical properties of graphene have been investigated. In particular, an unusual half-integer quantum Hall effect (QHE) and a non-zero Berry’s ...
Dyadic Green`s functions and guided surface waves for a surface
... carbon-based structures are of interest in emerging nanoelectronic applications. Particularly promising is graphene, which is a planar atomic layer of carbon atoms bonded in a hexagonal structure. Graphene is the two-dimensional version of graphite, and a single-wall carbon nanotube can be thought o ...
... carbon-based structures are of interest in emerging nanoelectronic applications. Particularly promising is graphene, which is a planar atomic layer of carbon atoms bonded in a hexagonal structure. Graphene is the two-dimensional version of graphite, and a single-wall carbon nanotube can be thought o ...
Observation of even denominator fractional quantum Hall effect in
... whose ground states are identified as non-Abelian Moore-Read states13 (i.e., the calculated ground state has a large overlap with the Moore-Read state, much larger than, for instance, with the 331 state). We interpret our results within the context of these theoretical predictions, whose validity i ...
... whose ground states are identified as non-Abelian Moore-Read states13 (i.e., the calculated ground state has a large overlap with the Moore-Read state, much larger than, for instance, with the 331 state). We interpret our results within the context of these theoretical predictions, whose validity i ...
Effective mass of electron in monolayer graphene: Electron
... The Hall mobility of electrons in the graphene sample increases monotonically with a decreasing temperature from room temperature, begins to level off at about 100 K, and saturates at about 50 K (see Fig. 1). This behavior reflects the 2D character of the electrons in the channel.26 Figure 3 shows a ...
... The Hall mobility of electrons in the graphene sample increases monotonically with a decreasing temperature from room temperature, begins to level off at about 100 K, and saturates at about 50 K (see Fig. 1). This behavior reflects the 2D character of the electrons in the channel.26 Figure 3 shows a ...
paper
... rehybridization of Mo atoms has been observed21 upon the formation of the interface, and the dominant contribution of these d-orbitals pins the Fermi-level close to the conduction band, leading to n-type SBH even in the case of metals with high work function (for example, Ir with a work function of ...
... rehybridization of Mo atoms has been observed21 upon the formation of the interface, and the dominant contribution of these d-orbitals pins the Fermi-level close to the conduction band, leading to n-type SBH even in the case of metals with high work function (for example, Ir with a work function of ...
Nano Letters, 12, 2032 (2012)
... unique electronic properties,3 such as high electron mobility4 and long mean free path,5 as well as their excellent optical properties,1,2,6,7 such as broadband optical absorption2,6,7 and ultrafast optical response.8−10 In this context, BLG may have better potential than single layer graphene for p ...
... unique electronic properties,3 such as high electron mobility4 and long mean free path,5 as well as their excellent optical properties,1,2,6,7 such as broadband optical absorption2,6,7 and ultrafast optical response.8−10 In this context, BLG may have better potential than single layer graphene for p ...
Effective mass of electron in monolayer graphene: Electron
... The Hall mobility of electrons in the graphene sample increases monotonically with a decreasing temperature from room temperature, begins to level off at about 100 K, and saturates at about 50 K (see Fig. 1). This behavior reflects the 2D character of the electrons in the channel.26 Figure 3 shows a ...
... The Hall mobility of electrons in the graphene sample increases monotonically with a decreasing temperature from room temperature, begins to level off at about 100 K, and saturates at about 50 K (see Fig. 1). This behavior reflects the 2D character of the electrons in the channel.26 Figure 3 shows a ...
Coordination-Resolved C−C Bond Length and the C 1s
... Hamiltonian nor follow the regular energy dispersion relation. The nonbonding electrons add, however, impurity states to the middle of the gap between the conduction and valence bands, or form the Dirac states near the Fermi energy level, which are responsible for the unusual behavior of graphene an ...
... Hamiltonian nor follow the regular energy dispersion relation. The nonbonding electrons add, however, impurity states to the middle of the gap between the conduction and valence bands, or form the Dirac states near the Fermi energy level, which are responsible for the unusual behavior of graphene an ...
Applied Physics Letters
... as electromagnetic enhancement is ruled out by hybrid electrodynamical and quantum mechanical C 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4755756] simulations. V The viability of graphene as a surface-enhanced Raman spectroscopy (SERS) substrate has been recently demonstrated. ...
... as electromagnetic enhancement is ruled out by hybrid electrodynamical and quantum mechanical C 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4755756] simulations. V The viability of graphene as a surface-enhanced Raman spectroscopy (SERS) substrate has been recently demonstrated. ...
Chiral Tunnelling in a Twisted Graphene Bilayer
... Figure 1(a) shows the general scheme that an chiral electron starts penetrating through a potential barrier U(x), which has a rectangular shape with width of D and height of E + ΔU (here E is the incident energy of the electron, ΔU is the energy difference between the potential barrier and the inci ...
... Figure 1(a) shows the general scheme that an chiral electron starts penetrating through a potential barrier U(x), which has a rectangular shape with width of D and height of E + ΔU (here E is the incident energy of the electron, ΔU is the energy difference between the potential barrier and the inci ...
ncomms14552 - The University of Manchester
... n for SGS devices made from gapped (aligned) and gapless (nonaligned) MLG. In the gapped device, the supercurrent is suppressed not only at the main CNP but also at secondary CNPs. For all electron and hole concentrations away from the CNPs, both devices exhibit the standard Fraunhofer pattern indic ...
... n for SGS devices made from gapped (aligned) and gapless (nonaligned) MLG. In the gapped device, the supercurrent is suppressed not only at the main CNP but also at secondary CNPs. For all electron and hole concentrations away from the CNPs, both devices exhibit the standard Fraunhofer pattern indic ...
Quantum Hall effect
... Robustness • Quantum picture it turns out truly delocalized states occur only at one energy...this is NOT obvious consequently, IQHE “steps” in Hall conductance are expected to be infinitely sharp at T=0, for a large sample ...
... Robustness • Quantum picture it turns out truly delocalized states occur only at one energy...this is NOT obvious consequently, IQHE “steps” in Hall conductance are expected to be infinitely sharp at T=0, for a large sample ...
Imaging electrostatically confined Dirac fermions in graphene
... hBN) is visible26,27 and the region is seen to be free of adsorbates. A dI /dVs map of the same region (Fig. 2c) reflects changes in the local density of states (LDOS) caused by the spatially varying charge density distribution. Since the p–n junction centre is stationary, we are able to move the ST ...
... hBN) is visible26,27 and the region is seen to be free of adsorbates. A dI /dVs map of the same region (Fig. 2c) reflects changes in the local density of states (LDOS) caused by the spatially varying charge density distribution. Since the p–n junction centre is stationary, we are able to move the ST ...
Phys. Rev. Lett. 103, 025301 (2009).
... Graphene [1,2], attracts a lot of attention due to the massless relativistic dispersion of its quasiparticles and their high mobility. Recently, it was shown that this material offers a unique opportunity to observe transport properties of a plasma of ultrarelativistic particles at moderately high t ...
... Graphene [1,2], attracts a lot of attention due to the massless relativistic dispersion of its quasiparticles and their high mobility. Recently, it was shown that this material offers a unique opportunity to observe transport properties of a plasma of ultrarelativistic particles at moderately high t ...
Observing Atomic Collapse Resonances in Artificial Nuclei on
... different Ca dimers within a cluster. This mechanism, however, can be excluded because the distance between Ca dimers is d ~ 2 nm, which would result in a peak energy measured from the Dirac point of E = ħνFk ~ ħνF(π/d) ~ 1 eV. This value exceeds by more than an order of magnitude the energy of the ...
... different Ca dimers within a cluster. This mechanism, however, can be excluded because the distance between Ca dimers is d ~ 2 nm, which would result in a peak energy measured from the Dirac point of E = ħνFk ~ ħνF(π/d) ~ 1 eV. This value exceeds by more than an order of magnitude the energy of the ...
Carbon – Science and Technology
... investigation of the combined electromagnetic-coherent transport problem in carbon based nanostructured materials and devices viz. graphene nanoribbons. The frequency-domain approach is introduced in order to describe a Poisson-Schrödinger / Dirac system in a quasi static framework. The time-domain ...
... investigation of the combined electromagnetic-coherent transport problem in carbon based nanostructured materials and devices viz. graphene nanoribbons. The frequency-domain approach is introduced in order to describe a Poisson-Schrödinger / Dirac system in a quasi static framework. The time-domain ...
Landau levels in graphene
... the bilayer. At the end I will show also some experimental evidence that prove the theoretically predicted dependences. ...
... the bilayer. At the end I will show also some experimental evidence that prove the theoretically predicted dependences. ...
Landau Levels in Graphene - Department of Theoretical Physics
... the bilayer. At the end I will show also some experimental evidence that prove the theoretically predicted dependences. ...
... the bilayer. At the end I will show also some experimental evidence that prove the theoretically predicted dependences. ...
physica status solidi - Harvard DASH
... with thinnest regions consisting of multiples of bi-layer graphene dominate. Graphene can also nucleate on a flat surface, where it becomes readily immobilized by carbon atoms, which in the initial stage of C deposition substituted some of the surface oxygen atoms. If a nano-sized graphene molecule ...
... with thinnest regions consisting of multiples of bi-layer graphene dominate. Graphene can also nucleate on a flat surface, where it becomes readily immobilized by carbon atoms, which in the initial stage of C deposition substituted some of the surface oxygen atoms. If a nano-sized graphene molecule ...
Quantum Hall effect in graphene: Status and prospects
... symmeteries of the honeycomb lattice. This pseudospin protects graphene electrons against backscattering off defects and impurities. This enhances the conductivity and explains why charge carriers in graphene tend not to localize. Graphene shows very interesting behaviour in the presence of a strong ...
... symmeteries of the honeycomb lattice. This pseudospin protects graphene electrons against backscattering off defects and impurities. This enhances the conductivity and explains why charge carriers in graphene tend not to localize. Graphene shows very interesting behaviour in the presence of a strong ...
Manifestations of phase-coherent transport in
... Ic ranged from a few tens of nanoamperes to almost 1 microampere, depending on the gate voltage and on the geometrical dimensions of the junctions. The typical device width was 1 µm and contact separations between 200 and 500 nm were studied. Note, in passing, that what we actually measure is the ...
... Ic ranged from a few tens of nanoamperes to almost 1 microampere, depending on the gate voltage and on the geometrical dimensions of the junctions. The typical device width was 1 µm and contact separations between 200 and 500 nm were studied. Note, in passing, that what we actually measure is the ...
Graphene
Graphene (/ˈɡræf.iːn/) is an allotrope of carbon in the form of a two-dimensional, atomic-scale, hexagonal lattice in which one atom forms each vertex. It is the basic structural element of other allotropes, including graphite, charcoal, carbon nanotubes and fullerenes. It can also be considered as an indefinitely large aromatic molecule, the limiting case of the family of flat polycyclic aromatic hydrocarbons.Graphene has many extraordinary properties. It is about 207 times stronger than steel by weight, conducts heat and electricity efficiently and is nearly transparent. Researchers have identified the bipolar transistor effect, ballistic transport of charges and large quantum oscillations in the material.Scientists have theorized about graphene for decades. It is quite likely that graphene was unwittingly produced in small quantities for centuries through the use of pencils and other similar applications of graphite, but it was first measurably produced and isolated in the lab in 2003. Research was informed by existing theoretical descriptions of its composition, structure and properties. High-quality graphene proved to be surprisingly easy to isolate, making more research possible.Andre Geim and Konstantin Novoselov at the University of Manchester won the Nobel Prize in Physics in 2010 ""for groundbreaking experiments regarding the two-dimensional material graphene.""The global market for graphene is reported to have reached $9 million by 2014 with most sales in the semiconductor, electronics, battery energy and composites industries.