Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime
We theoretically investigate thermoelectric effects in a quantum dot system under the influence of a linearly polarized photon field confined to a 3D cavity. A temperature gradient is applied to the system via two electron reservoirs that are connected to each end of the quantum dot system. The ther...
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MDPI AG
2019-05-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/9/5/741 |
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| author | Nzar Rauf Abdullah Chi-Shung Tang Andrei Manolescu Vidar Gudmundsson |
| author_facet | Nzar Rauf Abdullah Chi-Shung Tang Andrei Manolescu Vidar Gudmundsson |
| author_sort | Nzar Rauf Abdullah |
| collection | DOAJ |
| description | We theoretically investigate thermoelectric effects in a quantum dot system under the influence of a linearly polarized photon field confined to a 3D cavity. A temperature gradient is applied to the system via two electron reservoirs that are connected to each end of the quantum dot system. The thermoelectric current in the steady state is explored using a quantum master equation. In the presence of the quantized photons, extra channels, the photon replica states, are formed generating a photon-induced thermoelectric current. We observe that the photon replica states contribute to the transport irrespective of the direction of the thermal gradient. In the off-resonance regime, when the energy difference between the lowest states of the quantum dot system is smaller than the photon energy, the thermoelectric current is almost blocked and a plateau is seen in the thermoelectric current for strong electron–photon coupling strength. In the resonant regime, an inversion of thermoelectric current emerges due to the Rabi-splitting. Therefore, the photon field can change both the magnitude and the sign of the thermoelectric current induced by the temperature gradient in the absence of a voltage bias between the leads. |
| first_indexed | 2024-12-20T08:04:18Z |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-20T08:04:18Z |
| publishDate | 2019-05-01 |
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| series | Nanomaterials |
| spelling | doaj.art-94ab7e2ef7af4afcac350699fea7917e2022-12-21T19:47:27ZengMDPI AGNanomaterials2079-49912019-05-019574110.3390/nano9050741nano9050741Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State RegimeNzar Rauf Abdullah0Chi-Shung Tang1Andrei Manolescu2Vidar Gudmundsson3Physics Department, College of Science, University of Sulaimani, Sulaimani 46001, Kurdistan Region, IraqDepartment of Mechanical Engineering, National United University, 2, Lienda, Miaoli 36063, TaiwanSchool of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, IcelandScience Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, IcelandWe theoretically investigate thermoelectric effects in a quantum dot system under the influence of a linearly polarized photon field confined to a 3D cavity. A temperature gradient is applied to the system via two electron reservoirs that are connected to each end of the quantum dot system. The thermoelectric current in the steady state is explored using a quantum master equation. In the presence of the quantized photons, extra channels, the photon replica states, are formed generating a photon-induced thermoelectric current. We observe that the photon replica states contribute to the transport irrespective of the direction of the thermal gradient. In the off-resonance regime, when the energy difference between the lowest states of the quantum dot system is smaller than the photon energy, the thermoelectric current is almost blocked and a plateau is seen in the thermoelectric current for strong electron–photon coupling strength. In the resonant regime, an inversion of thermoelectric current emerges due to the Rabi-splitting. Therefore, the photon field can change both the magnitude and the sign of the thermoelectric current induced by the temperature gradient in the absence of a voltage bias between the leads.https://www.mdpi.com/2079-4991/9/5/741thermoelectric transportquantum dotQEDquantum master equationelectro-optical effects |
| spellingShingle | Nzar Rauf Abdullah Chi-Shung Tang Andrei Manolescu Vidar Gudmundsson Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime Nanomaterials thermoelectric transport quantum dot QED quantum master equation electro-optical effects |
| title | Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime |
| title_full | Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime |
| title_fullStr | Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime |
| title_full_unstemmed | Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime |
| title_short | Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime |
| title_sort | thermoelectric inversion in a resonant quantum dot cavity system in the steady state regime |
| topic | thermoelectric transport quantum dot QED quantum master equation electro-optical effects |
| url | https://www.mdpi.com/2079-4991/9/5/741 |
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