The interplay of electron–photon and cavity-environment coupling on the electron transport through a quantum dot system

Nzar Rauf Abdullah; Chi Shung Tang; Andrei Manolescu; Vidar Gudmundsson

doi:10.1016/j.physe.2020.113996

The interplay of electron–photon and cavity-environment coupling on the electron transport through a quantum dot system

Nzar Rauf Abdullah^*, Chi Shung Tang, Andrei Manolescu, Vidar Gudmundsson

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We theoretically investigate the characteristics of the electron transport through a two-dimensional a quantum dot system in the xy-plane coupled to a photon cavity and a photon reservoir, the environment. The electron–photon coupling, g_γ, and the cavity–reservoir coupling, κ, are tuned to study the system in the weak, g_γ≤κ, and the strong coupling regime, g_γ>κ. An enhancement of current is both seen with increasing g_γ and κ in the weak coupling regime for both x- and y-polarization of the photon field. This is a direct consequence of the Purcell effect. The current enhancement is due to the contribution of the photon replica states to the electron transport in which intraband transitions play an important role. The properties of the electron transport are drastically changed in the strong coupling regime with an x-polarized photon field in which the current is suppressed with increasing g_γ, but it is still increasing with κ. This behavior of the current is related to the population of purely electronic states and depopulation of photon replica states.

Original language	English
Article number	113996
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	119
DOIs	https://doi.org/10.1016/j.physe.2020.113996
Publication status	Published - May 2020

Bibliographical note

Funding Information:
This work was financially supported by the Research Fund of the University of Iceland, the Icelandic Research Fund, grant no. 163082-051, and the Icelandic Infrastructure Fund. The computations were performed on resources provided by the Icelandic High Performance Computing Center at the University of Iceland. NRA acknowledges support from University of Sulaimani and Komar University of Science and Technology. CST acknowledges the Ministry of Science and Technology, Taiwan through Contract no. MOST 106-2112-M-239-001-MY3.

Funding Information:
This work was financially supported by the Research Fund of the University of Iceland , the Icelandic Research Fund , grant no. 163082-051 , and the Icelandic Infrastructure Fund . The computations were performed on resources provided by the Icelandic High Performance Computing Center at the University of Iceland. NRA acknowledges support from University of Sulaimani and Komar University of Science and Technology . CST acknowledges the Ministry of Science and Technology, Taiwan through Contract no. MOST 106-2112-M-239-001-MY3 .

Publisher Copyright:
© 2020 Elsevier B.V.

Other keywords

Cavity-Quantum electrodynamics
Purcell effect
Quantum Dot
Quantum master equation
Quantum transport

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title = "The interplay of electron–photon and cavity-environment coupling on the electron transport through a quantum dot system",

abstract = "We theoretically investigate the characteristics of the electron transport through a two-dimensional a quantum dot system in the xy-plane coupled to a photon cavity and a photon reservoir, the environment. The electron–photon coupling, gγ, and the cavity–reservoir coupling, κ, are tuned to study the system in the weak, gγ≤κ, and the strong coupling regime, gγ>κ. An enhancement of current is both seen with increasing gγ and κ in the weak coupling regime for both x- and y-polarization of the photon field. This is a direct consequence of the Purcell effect. The current enhancement is due to the contribution of the photon replica states to the electron transport in which intraband transitions play an important role. The properties of the electron transport are drastically changed in the strong coupling regime with an x-polarized photon field in which the current is suppressed with increasing gγ, but it is still increasing with κ. This behavior of the current is related to the population of purely electronic states and depopulation of photon replica states.",

keywords = "Cavity-Quantum electrodynamics, Purcell effect, Quantum Dot, Quantum master equation, Quantum transport",

author = "Abdullah, {Nzar Rauf} and Tang, {Chi Shung} and Andrei Manolescu and Vidar Gudmundsson",

note = "Funding Information: This work was financially supported by the Research Fund of the University of Iceland, the Icelandic Research Fund, grant no. 163082-051, and the Icelandic Infrastructure Fund. The computations were performed on resources provided by the Icelandic High Performance Computing Center at the University of Iceland. NRA acknowledges support from University of Sulaimani and Komar University of Science and Technology. CST acknowledges the Ministry of Science and Technology, Taiwan through Contract no. MOST 106-2112-M-239-001-MY3. Funding Information: This work was financially supported by the Research Fund of the University of Iceland , the Icelandic Research Fund , grant no. 163082-051 , and the Icelandic Infrastructure Fund . The computations were performed on resources provided by the Icelandic High Performance Computing Center at the University of Iceland. NRA acknowledges support from University of Sulaimani and Komar University of Science and Technology . CST acknowledges the Ministry of Science and Technology, Taiwan through Contract no. MOST 106-2112-M-239-001-MY3 . Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

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AU - Abdullah, Nzar Rauf

AU - Tang, Chi Shung

AU - Manolescu, Andrei

AU - Gudmundsson, Vidar

N1 - Funding Information: This work was financially supported by the Research Fund of the University of Iceland, the Icelandic Research Fund, grant no. 163082-051, and the Icelandic Infrastructure Fund. The computations were performed on resources provided by the Icelandic High Performance Computing Center at the University of Iceland. NRA acknowledges support from University of Sulaimani and Komar University of Science and Technology. CST acknowledges the Ministry of Science and Technology, Taiwan through Contract no. MOST 106-2112-M-239-001-MY3. Funding Information: This work was financially supported by the Research Fund of the University of Iceland , the Icelandic Research Fund , grant no. 163082-051 , and the Icelandic Infrastructure Fund . The computations were performed on resources provided by the Icelandic High Performance Computing Center at the University of Iceland. NRA acknowledges support from University of Sulaimani and Komar University of Science and Technology . CST acknowledges the Ministry of Science and Technology, Taiwan through Contract no. MOST 106-2112-M-239-001-MY3 . Publisher Copyright: © 2020 Elsevier B.V.

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N2 - We theoretically investigate the characteristics of the electron transport through a two-dimensional a quantum dot system in the xy-plane coupled to a photon cavity and a photon reservoir, the environment. The electron–photon coupling, gγ, and the cavity–reservoir coupling, κ, are tuned to study the system in the weak, gγ≤κ, and the strong coupling regime, gγ>κ. An enhancement of current is both seen with increasing gγ and κ in the weak coupling regime for both x- and y-polarization of the photon field. This is a direct consequence of the Purcell effect. The current enhancement is due to the contribution of the photon replica states to the electron transport in which intraband transitions play an important role. The properties of the electron transport are drastically changed in the strong coupling regime with an x-polarized photon field in which the current is suppressed with increasing gγ, but it is still increasing with κ. This behavior of the current is related to the population of purely electronic states and depopulation of photon replica states.

AB - We theoretically investigate the characteristics of the electron transport through a two-dimensional a quantum dot system in the xy-plane coupled to a photon cavity and a photon reservoir, the environment. The electron–photon coupling, gγ, and the cavity–reservoir coupling, κ, are tuned to study the system in the weak, gγ≤κ, and the strong coupling regime, gγ>κ. An enhancement of current is both seen with increasing gγ and κ in the weak coupling regime for both x- and y-polarization of the photon field. This is a direct consequence of the Purcell effect. The current enhancement is due to the contribution of the photon replica states to the electron transport in which intraband transitions play an important role. The properties of the electron transport are drastically changed in the strong coupling regime with an x-polarized photon field in which the current is suppressed with increasing gγ, but it is still increasing with κ. This behavior of the current is related to the population of purely electronic states and depopulation of photon replica states.

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The interplay of electron–photon and cavity-environment coupling on the electron transport through a quantum dot system

Abstract

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