Effects of magnetic field on photon-induced quantum transport in a single dot-cavity system

Abdullah, Nzar Rauf; Fatah, Aziz H.; Fatah, J. M.

doi:10.1088/1674-1056/25/11/114206

Cited by 5 publications

(5 citation statements)

References 25 publications

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“…5 and Fig. 6 the imaginary part of dielectric function and the absorption coefficient are shown, respectively, for a parallel or in-plane, E in , (a) and a perpendicular or out of plane, E out , (b) electric field applied to the BLG structure [65,66,67]. The peaks in the imaginary part of the dielectric function in the presence of E in are due to optical transitions in the bandgap or very close to the bandgap.…”

Section: Optical Responsesmentioning

confidence: 99%

Conversion of the stacking orientation of bilayer graphene due to \break the interaction of BN-dopants

Abdullah,

Rashid,

Tang

et al. 2021

Preprint

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A conversion of AA-to AB-stacking bilayer graphene (BLG) due to interlayer interaction is demonstrated. Two types of interlayer interactions, an attractive and a repulsive, between the Boron and Nitrogen dopant atoms in BLG are found. In the presence of the attractive interaction, an AA-stacking of BN-codoped BLG is formed with a less stable structure leading to weak mechanical properties of the system. Low values of the Young modulus, the ultimate strength and stress, and the fracture strength are observed comparing to a pure BLG. In addition, the attractive interaction induces a small bandgap that deteriorates the thermal and optical properties of the system. In contrast, in the presence of a repulsive interaction between the B and N atoms, the AA-stacking is converted to a AB-stacking with a more stable structure. Improved mechanical properties such as higher Young modulus, the ultimate strength and stress, fracture strength are obtained comparing to the AA-stacked BN-codoped BLG. Furthermore, a larger bandgap of the AB-stacked bilayer enhances the thermal and the optical characteristics of the system.

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Section: Optical Responsesmentioning

confidence: 99%

Conversion of the stacking orientation of bilayer graphene due to \break the interaction of BN-dopants

Abdullah,

Rashid,

Tang

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The Si doped graphene nanosheets are called siligraphene nanosheets [42]. These two selected shapes are analogous to the triangle shape of semiconducting nanowires that have been used to control the efficiency of the solar cells [43] and the quantum dots embedded in semiconductor quantum wires used to design the resulting charge distribution [44][45][46] and thermoelectric [47] currents. Motivated by these geometrical shapes of the semiconducting materials, we consider the triangle and dot Si-dopant configurations FIG.…”

Section: Resultsmentioning

confidence: 99%

Silicon on a graphene nanosheet with triangle- and dot-shape: Electronic structure, specific heat, and thermal conductivity from first-principle calculations

2019

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The electronic structure, specific heat, and thermal conductivity of silicon embedded in a monolayer graphene nanosheet are studied using Density Functional Theory. Two different shapes of the substitutional Si doping in the graphene are studied, a triangular and a dot shape. The silicon doping of a graphene nanosheet, with the silicon atoms arranged in a triangular configuration in ortho-and para-positions, opens up a band gap transforming the sheet to a semiconducting material. The opening of the band gap is caused by the presence of the repulsion force between the silicon and carbon atoms decreasing the density of states around the Fermi energy. Consequently, the specific heat and the thermal conductivity of the system are suppressed. For graphene nanosheet doped with a dot-like configuration of silicon atoms, at the ortho-, meta-, and para-positions, the valence band crosses the Fermi level. This doping configuration increases the density of state at the Fermi level, but mobile charge are delocalized and diminished around the silicon atoms. As a result, the specific heat and the thermal conductivity are enhanced. Silicon substitutionally doped graphene nanosheets may be beneficial for photovoltaics and can further improve solar cell devices by controlling the geometrical configuration of the underlying atomic systems.

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“…In the second line of Equation 2, H Z = ±g * µ B B/2 is the Zeeman Hamiltonian defining the interaction between the magnetic moment of an electron and the external magnetic field (B), with µ B the Bohr magneton and g * = −0.44 the effective g-factor for GaAs. H C is the Coulomb interaction Hamiltonian between the electrons in the quantum wire [31,32]. It should be mentioned that the Coulomb interaction is neglected in the leads.…”

Section: Modelmentioning

confidence: 99%

Photon-Mediated Thermoelectric and Heat Currents through a Resonant Quantum Wire-Cavity System

2019

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We theoretically consider a short quantum wire, which on both ends is connected to leads that have different temperatures. The quantum wire is assumed to be coupled to a cavity with a single-photon mode. We calculate the heat and thermoelectric currents in the quantum wire under the effect of the photon field. In the absence of the photon field, a plateau in the thermoelectric current is observed due to the thermal smearing at a high temperature gradient. In the presence of the resonance photon field, when the energy spacing between the lowest states of the quantum wire is approximately equal to the photon energy, a suppression in thermoelectric current and negativity in the heat current are seen due to the dressed electron-photon states. It is also found that the cavity with high photon energy has more influence on the thermoelectric current at a high temperature gradient.

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Effects of magnetic field on photon-induced quantum transport in a single dot-cavity system

Cited by 5 publications

References 25 publications

Conversion of the stacking orientation of bilayer graphene due to \break the interaction of BN-dopants

Conversion of the stacking orientation of bilayer graphene due to \break the interaction of BN-dopants

Silicon on a graphene nanosheet with triangle- and dot-shape: Electronic structure, specific heat, and thermal conductivity from first-principle calculations

Photon-Mediated Thermoelectric and Heat Currents through a Resonant Quantum Wire-Cavity System

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