Frequency-driven quantum oscillations in a graphene layer under circularly polarized ac fields

Monroy, R. Vega; Castro, O. Martínez; Cohen, G. Salazar

doi:10.1016/j.physleta.2015.02.010

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…Recently, progress has been made to carry out a full quantum treatment where light is quantized. The issues discussed included the linear response of a two-band system to the quantized field [23], metal-insulator transition in graphene induced by circularly polarized photons [24] and frequencydriven quantum oscillations in a graphene layer under a circularly polarized photon field [25], to mention a few of them.…”

Section: Introductionmentioning

confidence: 99%

Quantum light and topological surface states

Dai¹,

Wang²

2017

J. Phys. B: At. Mol. Opt. Phys.

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We demonstrate theoretically that, when quantum light interacts with massless Dirac fermions on the surface of a three-dimensional topological insulator, the elementary excitation spectrum depends on the polarizations of quantum light. Linear-polarized light cannot open a gap and leads to an anisotropic Dirac cone, but circular-polarized light can induce a mass term and the sign of mass is determined by the helicity of light. The effects due to quantum fluctuations are also discussed.

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Section: Introductionmentioning

confidence: 99%

Quantum light and topological surface states

Dai¹,

Wang²

2017

J. Phys. B: At. Mol. Opt. Phys.

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“…Until now, the electronic and photonic transport in nanostructure has been discussed in many papers [1][2][3][4][5]. For example, in one paper, the non-dissipative electron transport in a nonstructure has been considered and argued that the electron coupling to photons in field-dressed nanostructures may lead to the ground electron-photon state with a nonzero electric current.…”

Section: Introductionmentioning

confidence: 99%

“…In another paper, authors discussed that in monolayer of graphene, the displacement of the structure of photon-dressed electron states near the Fermi level and the electron transitions, from extended states to bound photon-dressed electron states inside an energy gap, causes a periodic change of singularities in the electron density of states. This event leads to the quantum oscillations in thermodynamic, transport and other properties in graphene [3]. Some other authors investigated the influence of a circularly polarized cavity photon field on the transport properties of a finite-width ring, in which the electrons are subject to spin-orbit and Coulomb interaction.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Electron Transport in Nanostructures by Using the Concept of BIons in M-theory

Sepehri

Pinčák

2016

Int J Theor Phys

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In this paper, using the similarity between quantum tunnels in nanostructures and BIon in M-theory, we propose a new model which considers the process of formation of superconductors in nanostructures. We show that by decreasing the size of nanostructures, emitted photons by electrons connect to each other and form a wormhole-like tunnel. This tunnel is a channel for transporting electron inside the nanostructure. If different wormholelike tunnels join to each other, one big tunnel is constructed that can be an origin for superconductivity in matter. The superconductor order parameter depends on the size of nanostructure and temperature. Increasing temperature, it is shown that the model matches with quantum theory prescriptions. Also, by applying external electromagnetism, external photons interact with exchanging photons between electrons, exchanging photons deviate from original route and the formation of wormhole-like tunnels inside a nanostructure is prevented. Finally, it is shown that the origin of electrodynamics and gravity are the same and thus, the phrase of wormhole can be applied for appeared tunnels in nanostructures.

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“…In this connection, δ f is the parameter that characterizes the deviation of ζ f from the E f value at T = 0. The shifting of the singularities, driven by the field frequency, leads to periodic change of the density of states (DOS) (which is related to the Green function in eq ) for photon-dressed electrons and at the same time to the rising of the Fermi wave-vector k f . In other words, as one can see by definition of the ε g quantity, it depends inversely on the field frequency; therefore if the frequency increases, then ε g decreases and this way decreases the density of photon-dressed electrons inside the gap.…”

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confidence: 99%

Photon-Induced Quantum Oscillations of the Terahertz Conductivity in Graphene

Monroy

Cohen

2016

Nano Lett.

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In this work, we present a theory that is able to explain the nonmonotonic decreasing behavior (observed in experimental data1-12) of the graphene terahertz conductivity with the increase of the field frequency. In this connection, the displacement of the structure of topological states inside the energy band gap, which appears in graphene due to the strong photon-electron coupling, and the narrowing of this gap, as result of electron transitions from bound photon-dressed electron states to extended states outside the energy gap driven by the field frequency, lead to a periodic change of singularities near the edge of the band gap, resulting in subtle quantum oscillations of the dynamical terahertz conductivity. This quantum contribution complements the Drude response, which fits the spectral range. On the other hand, the scattering processes by impurities favor interband transitions, suppressing this way intraband terahertz absorptions, which are related to optical transitions from inside to outside the gap.

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Frequency-driven quantum oscillations in a graphene layer under circularly polarized ac fields

Cited by 4 publications

References 20 publications

Quantum light and topological surface states

Quantum light and topological surface states

Modeling the Electron Transport in Nanostructures by Using the Concept of BIons in M-theory

Photon-Induced Quantum Oscillations of the Terahertz Conductivity in Graphene

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