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Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime

Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime


Title: Thermoelectric Inversion in a Resonant Quantum Dot-Cavity System in the Steady-State Regime
Author: Abdullah, Nzar Rauf
Tang, Chi-Shung
Manolescu, Andrei   orcid.org/0000-0002-0713-4664
Gudmundsson, Vidar   orcid.org/0000-0001-8939-3522
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

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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.

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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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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