Strain effect on the optical conductivity of graphene

Pellegrino, Francesco; Angilella, G. G. N.; Pucci, R.

doi:10.1103/physrevb.81.035411

Cited by 232 publications

(197 citation statements)

References 51 publications

(55 reference statements)

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“…The possibility of a straininduced semimetal-to-semiconductor transition, with the opening of a gap, has been therefore studied [24][25][26][27] . It turns out that this critically depends on the direction of applied strain, as is also confirmed by studies of the strain effect on the optical conductivity of graphene [28][29][30] .…”

Section: Introductionmentioning

confidence: 76%

“…While valence and conduction bands vanish linearly as q → ±k D for moderately low applied strain, such an approximation breaks down at a critical value of the strain modulus ε, depending on the direction θ of applied strain, when ±k D tends to either midpoint M of the 1BZ border. This has been described in terms of an electronic topological transition (ETT), since it is accompanied by a change of topology of the Fermi line 28 . Fig.…”

Section: Effect Of Strain On the Plasmon Dispersion Relationmentioning

confidence: 99%

“…Sec. II D), and corresponds to the strain dependence obtained for the optical conductivity 28 . Indeed, from Eq.…”

Section: Effect Of Strain On the Plasmon Dispersion Relationmentioning

confidence: 99%

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Dynamical polarization of graphene under strain

2010

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We study the dependence of the plasmon dispersion relation of graphene on applied uniaxial strain. Besides electron correlation at the RPA level, we also include local field effects specific for the honeycomb lattice. As a consequence of the two-band character of the electronic band structure, we find two distinct plasmon branches. We recover the square-root behavior of the low-energy branch, and find a nonmonotonic dependence of the strain-induced modification of its stiffness, as a function of the wavevector orientation with respect to applied strain.

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Section: Introductionmentioning

confidence: 76%

Section: Effect Of Strain On the Plasmon Dispersion Relationmentioning

confidence: 99%

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Dynamical polarization of graphene under strain

2010

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“…Then, while spatial momentum will, generically, no longer be conserved, energy still will be. It may be possible to experimentally realize the deformations studied in [14] in real materials, such as strained graphene [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Diffusion in inhomogeneous media

2017

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We consider the transport of conserved charges in spatially inhomogeneous quantum systems with a discrete lattice symmetry. We analyze the retarded two-point functions involving the charges and the associated currents at long wavelengths, compared to the scale of the lattice, and, when the dc conductivities are finite, extract the hydrodynamic modes associated with diffusion of the charges. We show that the dispersion relations of these modes are related to the eigenvalues of a specific matrix constructed from the dc conductivities and certain thermodynamic susceptibilities, thus obtaining generalized Einstein relations. We illustrate these general results in the specific context of relativistic hydrodynamics where translation invariance is broken using spatially inhomogeneous and periodic deformations of the stress tensor and the conserved Uð1Þ currents. Equivalently, this corresponds to considering hydrodynamics on a curved manifold, with a spatially periodic metric and chemical potential, and we obtain the dispersion relations for the heat and charge diffusive modes.

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“…[26,27,28,29,30,31], where the geometrical deformations of the graphene sheet change the electronic and optical properties of the pristine material. The optical conductivity for strained graphene (in-plane displacements) was calculated in [28,29] using a tight-binding approach. In the present work, we rely on a quantum field theoretical approach with curvature to compute the effect of out-of-plane deformations on the graphene optical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Optical conductivity of curved graphene

Chaves

Frederico

Oliveira

et al. 2014

J. Phys.: Condens. Matter

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Abstract. We compute the optical conductivity for an out-of-plane deformation in graphene using an approach based on solutions of the Dirac equation in curved space. Different examples of periodic deformations along one direction translates into an enhancement of the optical conductivity peaks in the region of the far and mid infrared frequencies for periodicities ∼ 100 nm. The width and position of the peaks can be changed by dialling the parameters of the deformation profiles. The enhancement of the optical conductivity is due to intraband transitions and the translational invariance breaking in the geometrically deformed background. Furthemore, we derive an analytical solution of the Dirac equation in a curved space for a general deformation along one spatial direction. For this class of geometries, it is shown that curvature induces an extra phase in the electron wave function, which can also be explored to produce interference devices of the Aharonov-Bohm type.

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Strain effect on the optical conductivity of graphene

Cited by 232 publications

References 51 publications

Dynamical polarization of graphene under strain

Dynamical polarization of graphene under strain

Diffusion in inhomogeneous media

Optical conductivity of curved graphene

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