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

Abdullah, Nzar Rauf; Marif, Rawezh Bakr; Rashid, Hunar Omar

doi:10.3390/en12061082

Cited by 10 publications

(5 citation statements)

References 40 publications

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“…Asymmetric peaks in the PDOS close to the highest occupied state shown in Fig. 3, and the opening up of a bandgap are expected to increase the S, ZT and L in BLG-1, BLG-2 and BLG-3 structures [60,61]. A small bandgap of BLG-1 induces small S, ZT and L, while the largest bandgap of BLG-2 gives the maximum values of S, ZT and L. Therefore, one can expect a higher thermoelectric performance for the BLG-2.…”

Section: Thermal Propertiesmentioning

confidence: 98%

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: Thermal Propertiesmentioning

confidence: 98%

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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show abstract

“…In previous publications, we demonstrated the effects of a photon cavity on the time-dependent electron transport in a strong electron-photon coupling regimes for both charge and thermoelectric transport through, a QD [20,21], a DQD [22], quantum wires [23][24][25] and quantum rings [26]. In theses publications, we have shown that the photon field in the cavity can be used to control the transport properties of the systems in the early transient regime were non-Markovian effects may be important.…”

Section: Introductionmentioning

confidence: 99%

The photocurrent generated by photon replica states of an off-resonantly coupled dot-cavity system

Abdullah

Tang

Manolescu

et al. 2019

Sci Rep

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Transport properties of a quantum dot coupled to a photon cavity are investigated using a quantum master equation in the steady-state regime. In the off-resonance regime, when the photon energy is smaller than the energy spacing between the lowest electron states of the quantum dot, we calculate the current that is generated by photon replica states as the electronic system is pumped with photons. Tuning the electron-photon coupling strength, the photocurrent can be enhanced by the influences of the photon polarization, and the cavity-photon coupling strength of the environment. We show that the current generated through the photon replicas is very sensitive to the photon polarization, but it is not strongly dependent on the average number of photons in the environment.

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

Cited by 10 publications

References 40 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

The photocurrent generated by photon replica states of an off-resonantly coupled dot-cavity system

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

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