Effect of gap opening on the quasiparticle properties of doped graphene sheets

Qaiumzadeh, Alireza; Joibari, Fateme K.; Asgari, Reza

doi:10.1140/epjb/e2010-00125-3

Cited by 4 publications

(8 citation statements)

References 38 publications

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“…These quantities are related to some important physical properties of both theoretical and practical applications like the band structure of ARPES, the energy dissipation rate of injected carriers and the width of the QP spectral function. [61,62] In the G 0 W approximation, the self-energy of gapped graphene is given by (β = 1/(k B T )) [63]:…”

Section: The Qp Self-energy and The Spectral Functionmentioning

confidence: 99%

The effect of sublattice symmetry breaking on the electronic properties of doped graphene

Qaiumzadeh

Asgari

2009

New J. Phys.

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Motivated by a number of recent experimental studies, we have carried out the microscopic calculation of the quasiparticle self-energy and spectral function in a doped graphene when a symmetry breaking of the sublattices is occurred. Our systematic study is based on the manybody G 0 W approach that is established on the random phase approximation and on graphene's massive Dirac equation continuum model. We report extensive calculations of both the real and imaginary parts of the quasiparticle self-energy in the presence of a gap opening. We also present results for spectral function, renormalized Fermi velocity and band gap renormalization of massive Dirac Fermions over a broad range of electron densities. We further show that the mass generating in graphene washes out the plasmaron peak in spectral weight.

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Section: The Qp Self-energy and The Spectral Functionmentioning

confidence: 99%

The effect of sublattice symmetry breaking on the electronic properties of doped graphene

Qaiumzadeh

Asgari

2009

New J. Phys.

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“…Imaginary part of the self-energy evaluated at the on-shell energy starts from ξ σ + (k) = −ε σ F , exhibits a minimum at zero energy and then grows up. Scattering rate in graphene is a smooth function which is in contrast with the conventional 2D semiconductors and 2D electron liquids because of the absence of both plasmon emission and interband processes 38 . We also see in Fig.…”

Section: Numerical Resultsmentioning

confidence: 92%

Spin polarization dependence of quasiparticle properties in graphene

2012

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We address spin polarization dependence of graphene's Fermi liquid properties quantitatively using a microscopic Random Phase Approximation theory in an interacting spin-polarized Dirac electron system. We show an enhancement of the minority-spin many-body velocity renormalization at fully spin polarization due to reduction in the electron density and consequently increase in the interaction between electrons near the Fermi surface. We also show that the spin dependence of the Fermi velocity in the chiral Fermi systems is different than that in a conventional two-dimensional electron liquid. In addition, we show that the ratio of the majority- to minority-spin lifetime is smaller than unity and related directly to the polarization and electron energy. The spin-polarization dependence of the carrier Fermi velocity is of significance in various spintronic applications.Comment: 9 pages, 6 figures. To appear in Phys. Rev.

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“…For the gapless graphene system the scattering rate is only due to the intra-band SPE process, 48 and in the cases of gapped and bilayer graphene the plasmon emission is the dominant decay process. 28,38 In the VSP silicene, however, there is a coexistence of both the gapless and electric-induced gapped states in each valley so the situation is rather more complicated. On the other hand, in VSP silicene under an exchange field, different subbands contain unequal electron densities (see Fig.…”

Section: B Quasiparticle Scattering Ratementioning

confidence: 99%

“…For a doped gapped graphene, the quasiparticle lifetime calculations have been performed and a reduction in its value by increasing the gap has been obtained. 38 Also, the single-particle relaxation time of silicene in the presence of neutral and charged impurities has been investigated and compared with its transport relaxation time. 39 The inelastic scattering rate is related to the single-particle level broadening and can be calculated from the imaginary part of the self-energy that contains information about different interactions.…”

Section: Introductionmentioning

confidence: 99%

Plasmon-phonon coupling in a valley-spin-polarized two-dimensional electron system: A theoretical study on monolayer silicene

et al. 2018

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We study the hybrid excitations due to the coupling between surface optical phonons of a polar insulator substrate and plasmons in the valley-spin-polarized metal phase of silicene under an exchange field. We perform the calculations within the generalized random-phase approximation where the plasmon-phonon coupling is taken into account by the long-range Fröhlich interaction. Our investigation on two hybridized plasmon branches in different spin and valley subbands shows distinct behavior compared to the uncoupled case. Interestingly, in one valley, it is found that while the high energy hybrid branch is totally damped in the spin-up state, it can be well-defined in the the spin-down state. Moreover, we show that the electron-phonon coupling is stronger in both spin-down subbands, regardless of valley index, due to their higher electron densities. In addition, we study the effects of electron-phonon coupling on the quasiparticle scattering rate of four distinct spin-valley locked subbands. The results of our calculations predict a general enhancement in the scattering rate for all subbands, and a jump in the case of spin-down states. This sharp increase associated to the damping of hybrid plasmon modes is almost absent in the uncoupled case. The results suggest an effective way for manipulating collective modes of valley-spin-polarized silicene which may become useful in future valleytronic and spintronic applications. arXiv:1811.12071v1 [cond-mat.mes-hall]

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Effect of gap opening on the quasiparticle properties of doped graphene sheets

Cited by 4 publications

References 38 publications

The effect of sublattice symmetry breaking on the electronic properties of doped graphene

The effect of sublattice symmetry breaking on the electronic properties of doped graphene

Spin polarization dependence of quasiparticle properties in graphene

Plasmon-phonon coupling in a valley-spin-polarized two-dimensional electron system: A theoretical study on monolayer silicene

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