Title: | Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime |
Author: |
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Date: | 2019-05-14 |
Language: | English |
Scope: | 741 |
University/Institute: | Háskóli Íslands University of Iceland Reykjavik University Háskólinn í Reykjavík |
School: | Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) School of Science and Engineering (RU) Tækni- og verkfræðideild (HR) |
Department: | Science Institute (UI) Raunvísindastofnun (HÍ) |
Series: | Nanomaterials;9(5) |
ISSN: | 2079-4991 |
DOI: | 10.3390/nano9050741 |
Subject: | Electro-optical effects; QED; Quantum dot; Quantum master equation; Thermoelectric transport; Skammtarafsegulfræði |
URI: | https://hdl.handle.net/20.500.11815/1747 |
Citation:Abdullah, N.R.; Tang, C.-S.; Manolescu, A.; Gudmundsson, V. Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime. Nanomaterials 2019, 9, 741.
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Abstract: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.
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Description:Publisher's version (útgefin grein)
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Rights:This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
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