Optical conductivity of graphene in the presence of random lattice deformations

Sinner, Andreas; Sedrakyan, A.; Ziegler, K.

doi:10.1103/physrevb.83.155115

Cited by 12 publications

(18 citation statements)

References 35 publications

(48 reference statements)

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“…Many authors have studied this model in connection with different problems, which include the spectrum of fullerenes [74], the modelling of disclinations [75,76], graphene wormholes [77] proposals of metrics to generate in optical lattices [78], the holography conjecture [79] and the Unruh effect [80,81,82]. This model has also been applied to the study of the optical conductivity in graphene [83,84], to the scattering by smooth deformations in topological insulator surfaces [85,86], and to study the Quantum Hall effect [87].…”

Section: Quantum Field Theory In Curved Spacesmentioning

confidence: 99%

Novel effects of strains in graphene and other two dimensional materials

Amorim¹,

Cortijo²,

Juan³

et al. 2016

Physics Reports

377

401

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√s NN = 5.02 TeV using the ALICE detector at the LHC. The measurement covers the p T interval 0.5 < p T < 12 GeV/c and the rapidity range −1.065 < y cms < 0.135 in the centre-of-mass reference frame. The contribution of electrons from background sources was subtracted using an invariant mass approach. The nuclear modification factor R pPb was calculated by comparing the p T -differential invariant cross section in p-Pb collisions to a pp reference at the same centre-of-mass energy, which was obtained by interpolating measurements at √ s = 2.76 TeV and √ s = 7 TeV. The R pPb is consistent with unity within uncertainties of about 25%, which become larger for p T below 1 GeV/c. The measurement shows that heavy-flavour production is consistent with binary scaling, so that a suppression in the high-p T yield in Pb-Pb collisions has to be attributed to effects induced by the hot medium produced in the final state. The data in p-Pb collisions are described by recent model calculations that include cold nuclear matter effects. IntroductionThe Quark-Gluon Plasma (QGP) [1,2], a colour-deconfined state of strongly-interacting matter, is predicted to exist at high temperature according to lattice Quantum Chromodynamics (QCD) calculations [3]. These conditions can be reached in ultra-relativistic heavy-ion collisions [4][5][6][7][8][9][10]. Charm and beauty (heavy-flavour) quarks are mostly produced in initial hard scattering processes on a very short time scale, shorter than the formation time of the QGP medium [11], and thus experience the full temporal and spatial evolution of the collision. While interacting with the QGP medium, heavy quarks lose energy via elastic and radiative processes [12][13][14]. Heavy-flavour hadrons are therefore well-suited probes to study the properties of the QGP. The effect of energy loss on heavy-flavour production can be characterised via the nuclear modification factor (R AA ) of heavy-flavour hadrons. The R AA is defined as the ratio of the heavy-flavour hadron yield in nucleusnucleus (A-A) collisions to that in proton-proton (pp) collisions scaled by the average number of binary nucleon-nucleon collisions. The R AA is studied differentially as a function of transverse momentum (p T ), rapidity ( y) and collision centrality. It was measured at the Relativistic Heavy Ion Collider (RHIC) [15][16][17][18] and at the Large Hadron Collider (LHC) [19][20][21][22]. At RHIC, in central The interpretation of the measurements in A-A collisions requires the study of heavy-flavour production in p-A collisions, which provides access to cold nuclear matter (CNM) effects. These effects are not related to the formation of a colour-deconfined medium, but are present in case of colliding nuclei (or protonnucleus). An important CNM effect in the initial state is partondensity shadowing or saturation, which can be described using modified parton distribution functions (PDF) in the nucleus [23] or using the Color Glass Condensate (CGC) effective theory [24]. Further CNM effects include energy loss [25] in...

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Section: Quantum Field Theory In Curved Spacesmentioning

confidence: 99%

Novel effects of strains in graphene and other two dimensional materials

Amorim¹,

Cortijo²,

Juan³

et al. 2016

Physics Reports

377

401

View full text Add to dashboard Cite

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“…Besides the long-range charged impurities, 22,36,37 other possible scattering sources such as ripples, 38 strong random on-site potentials, 39 large concentration of hydrogen adatoms, 39 strain, 40,41 or random deformations of the honeycomb lattice have been considered. 42,43 In this paper, we report a systemic study of the optical spectrum of graphene with different kinds of disorder for both doped and undoped graphene, such as the randomness of the on-site potentials and fluctuation of the nearest-neighbor hopping. Special attention is paid to the presence of resonant impurities, e.g., vacancies and hydrogen adatoms, which have been proposed as the main factors limiting the carrier mobility in graphene.…”

Section: Introductionmentioning

confidence: 99%

Optical conductivity of disordered graphene beyond the Dirac cone approximation

et al. 2011

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In this paper we systemically study the optical conductivity and density of states of disordered graphene beyond the Dirac cone approximation. The optical conductivity of graphene is computed by using the Kubo formula, within the framework of a full π -band tight-binding model. Different types of noncorrelated and correlated disorder are considered, such as random or Gaussian potentials, random or Gaussian nearest-neighbor hopping parameters, randomly distributed vacancies or their clusters, and randomly adsorbed hydrogen atoms or their clusters. For a large enough concentration of resonant impurities, an additional peak in the optical conductivity is found, associated with transitions between the midgap states and the Van Hove singularities of the main π band. We further discuss the effect of doping on the spectrum, and find that small amounts of resonant impurities are enough to obtain a background contribution to the conductivity in the infrared part of the spectrum, in agreement with recent experiments.

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“…The anesthetic potency of S-ketamine is two to three times higher than that of the racemic mixture. The incidence of undesirable effects at equal plasma concentrations is identical for both enantiomers, but since lower doses of the S-enantiomer are needed to maintain an equal state of anesthesia, fewer side effects and shorter recovery times are seen with the single enantiomer preparation [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Enantioselective capillary electrophoresis for the assessment of CYP3A4‐mediated ketamine demethylation and inhibition in vitro

Kwan

Thormann

2011

Electrophoresis

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Enantioselective CE with sulfated cyclodextrins as chiral selectors was used to determine the CYP3A4-catalyzed N-demethylation kinetics of ketamine to norketamine and its inhibition in the presence of ketoconazole in vitro. Ketamine, a chiral phencyclidine derivative, was incubated with recombinant human CYP3A4 from a baculovirus expression system as racemic mixture and as single enantiomer. Alkaline liquid/liquid extracts of the samples were analyzed with a pH 2.5 buffer comprising 50 mM Tris and phosphoric acid together with either multiple isomer sulfated β-cyclodextrin (10 mg/mL) or highly sulfated γ-cyclodextrin (2%, w/v). Data obtained in the absence of ketoconazole revealed that the N-demethylation occurred stereoselectively with Michaelis-Menten (incubation of racemic ketamine) and Hill (separate incubation of single enantiomers) kinetics. Data generated in the presence of ketoconazole as the inhibitor could best be fitted to a one-site competitive model and inhibition constants were calculated using the equation of Cheng and Prusoff. No stereoselective difference was observed, but inhibition constants for the incubation of racemic ketamine were found to be larger compared with those obtained with the incubation of single ketamine enantiomers.

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Optical conductivity of graphene in the presence of random lattice deformations

Cited by 12 publications

References 35 publications

Novel effects of strains in graphene and other two dimensional materials

Novel effects of strains in graphene and other two dimensional materials

Optical conductivity of disordered graphene beyond the Dirac cone approximation

Enantioselective capillary electrophoresis for the assessment of CYP3A4‐mediated ketamine demethylation and inhibition in vitro

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