Possible polaron formation of zigzag graphene nano-ribbon in the presence of Rashba spin–orbit coupling

Modarresi, M.; Moğulkoç, A.; Roknabadi, Mahmood Rezaee; Shahtahmasebi, N.

doi:10.1016/j.physe.2014.10.006

Cited by 17 publications

(7 citation statements)

References 40 publications

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“…However, in most cases the repulsive polaron is thermodynamically unstable in the strong interaction region even at low-temperature. While for the attractive polaron, whose eigenenergy is negative, it can be observed in the solid state systems [13,16,17,18,19,20] including the topological materials, through the, e.g., substrate-related polaronic effect. Besides, the effects of both the intrinsic and extrinsic (like the electric field-induced Rashba) spin-orbit coupling on the polaron have also been explored [16,17,18,19], and it is found that the spin-orbit coupling is also related to the polaron-molecule transition [21].…”

Section: Introductionmentioning

confidence: 99%

“…While for the attractive polaron, whose eigenenergy is negative, it can be observed in the solid state systems [13,16,17,18,19,20] including the topological materials, through the, e.g., substrate-related polaronic effect. Besides, the effects of both the intrinsic and extrinsic (like the electric field-induced Rashba) spin-orbit coupling on the polaron have also been explored [16,17,18,19], and it is found that the spin-orbit coupling is also related to the polaron-molecule transition [21]. The quasiparticle residue Z (spectral weight), as an important property of the polarons, which can be measured by the Rabi oscillations [22], is finite even at zero-energy state for the parabolic system or normal Dirac semimetals, but it vanishes at zero-energy state for the Weyl semimetals which with higher dispersion [23,24] (i.e., the multi-Weyl semimetal).…”

Section: Introductionmentioning

confidence: 99%

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Attractive polaron formed in doped nonchiral/chiral parabolic system within ladder approximation

2020

Physica B: Condensed Matter

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We investigate the properties of attractive polaron formed by a single impurity dressed with the particle-hole excitations in a three-dimensional (3D) doped (extrinsic) parabolic system. Base on the single particle-hole variational ansatz, we study the pair propagator, self-energy, and the non-self-consistent medium T -matrix. The non-self-consistent T -matrix discussed in this paper contains only the open channel since we don't consider the shift of center-of-mass due to the resonance (e.g., induced by the magnetic field). Besides, since we focus on the low-density regime of the majority particles, the effective Fermi wave vector is small. The scattering form factor is discussed in detail for the chiral case and compared to the non-chiral one. The effects of the bare coupling strength, which is momentum-cutoff-dependent, are also discussed. We found that the pair propagator and the related quantities, like the self-energy, spectral function, induced effective mass, and residue (spectral weight), all exhibit different features in the low-momentum regime and the high one, which also related to the polaronic instabilities as well as the many-body fluctuation and nonadiabatic/adiabatic dynamics. The pair-propagator and the energy relaxation time at finite temperature are also explored.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Attractive polaron formed in doped nonchiral/chiral parabolic system within ladder approximation

2020

Physica B: Condensed Matter

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“…Recently, some experimental 3–7 and theoretical 8–13 studies — including our previous researches 14–18 — have addressed the charge transport mechanism, along with its underlying properties, in GNRs. Bischoff and coworkers have pointed out that, for the electrical transport experiments in GNRs, there are in the literature different interpretations of similar findings 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Contrarily, Modarresi et al . have proposed a semiconducting-like behavior for the charge transport mechanism in zig-zag GNRs through the possible polaron formation in the presence of Rashba spin-orbit coupling 8 . It is worthwhile to mention here that, in organic low-dimensional systems, polarons are self-localized electronic states yielded due to their strong electron-lattice interactions.…”

Section: Introductionmentioning

confidence: 99%

Bipolaron Dynamics in Graphene Nanoribbons

Silva

Ribeiro

Pereira

et al. 2019

Sci Rep

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Graphene nanoribbons (GNRs) are two-dimensional structures with a rich variety of electronic properties that derive from their semiconducting band gaps. In these materials, charge transport can occur via a hopping process mediated by carriers formed by self-interacting states between the excess charge and local lattice deformations. Here, we use a two-dimensional tight-binding approach to reveal the formation of bipolarons in GNRs. Our results show that the formed bipolarons are dynamically stable even for high electric field strengths when it comes to GNRs. Remarkably, the bipolaron dynamics can occur in acoustic and optical regimes concerning its saturation velocity. The phase transition between these two regimes takes place for a critical field strength in which the bipolaron moves roughly with the speed of sound in the material.

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“…In recently years, many researchers domestic and overseas have researched properties of graphene from the aspects of theory and experiment. So far the influence of the magnetic field effect and the Rashba effect on properties of the graphene has been discussed, the results show that solutions to the impurity problem which are qualitatively different from those of zero magnetic field has been found by numerical diagonalization of the large Hamiltonian matrices; the properties of the polaron on the electronic structure of zigzag graphene nanoribbon with different width have been researched by a unitary transformation to get an effective Hamiltonian for nanoribbon in the case of considering electron-phonon interaction [1,2]. Apart from these impurity factors, the Coulomb impurity problem in graphene has also been addressed.…”

Section: Introductionmentioning

confidence: 99%

The properties of strong couple bound polaron in monolayer graphene

Ding

Zhao

Xiao

2016

Superlattices and Microstructures

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Based on the Hamiltonian of the interaction energy between electron on the surface of the graphene and longitudinal acoustic phonon on the surface of the substrate, the paper studies the properties of strong couple polaron in monolayer graphene considering the coulomb doping problem. The conventional Lee-Low-Pine unitary transformation method and linear combination operator method are used to calculate the ground state energy of the polaron. The results show that the ground state energy of the system has a linear relationship with the magnetic field strength, the cutoff wave number, the coulomb bound parameter, the distance between the graphene and the substrates, meanwhile, the ground state energy will split into two branches near the Dirac point.

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Possible polaron formation of zigzag graphene nano-ribbon in the presence of Rashba spin–orbit coupling

Cited by 17 publications

References 40 publications

Attractive polaron formed in doped nonchiral/chiral parabolic system within ladder approximation

Attractive polaron formed in doped nonchiral/chiral parabolic system within ladder approximation

Bipolaron Dynamics in Graphene Nanoribbons

The properties of strong couple bound polaron in monolayer graphene

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