Effects of coupling strength of the electron–photon and the photon–environment interactions on the electron transport through multiple-resonances of a double quantum dot system in a photon cavity

Halo Anwar Abdulkhalaq*, Nzar Rauf Abdullah, Vidar Gudmundsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We study electron transport properties through a double quantum dot (DQD) system coupled to a single mode photon cavity, DQD-cavity. The DQD system has a complex multilevel energy spectrum, in which by tuning the photon energy several anti-crossings between the electron states of the DQD system and photon dressed states are produced, which have not been seen in a simple two level DQD system. Three different regions of the photon energy are studied based on anti-crossings, where the photon energy ranges are classified as “low”, “intermediate”, and “high”. The anti-crossings represent multiple Rabi-resonances, which lead to a current dip in the electron transport at the “intermediate” photon energy. Increasing the electron–photon coupling strength, gγ, the photon exchanges between the anti-crossing states are changed leading to a dislocation of the multiple Rabi resonance states. Consequently, the current dip at the intermediate photon energy is further reduced. Additionally, we tune the cavity–environment coupling, κ, to see how the transport properties in the strong coupling regime, gγ>κ, are changed for different directions of the photon polarization. Increasing κ with a constant value of gγ, a current enhancement in the intermediate photon energy is found, and a reduction in the current is seen for the “high” photon energy range. The current enhancement in the intermediate photon energy is caused by the weakening of the multiple Rabi-resonance in the system.

Original languageEnglish
Article number414097
JournalPhysica B: Condensed Matter
Volume641
DOIs
Publication statusPublished - 15 Sept 2022

Bibliographical note

Funding Information:
This work was financially supported by the University of Sulaimani, Iraq and the Research center of Komar University of Science and Technology, Iraq . The computations were performed on the IHPC facilities provided by the University of Iceland.

Funding Information:
This work was financially supported by the University of Sulaimani, Iraq and the Research center of Komar University of Science and Technology, Iraq. The computations were performed on the IHPC facilities provided by the University of Iceland.

Publisher Copyright:
© 2022 Elsevier B.V.

Other keywords

  • Cavity quantum electrodynamics
  • Electron transport
  • Quantum dots
  • Quantum master equation

Fingerprint

Dive into the research topics of 'Effects of coupling strength of the electron–photon and the photon–environment interactions on the electron transport through multiple-resonances of a double quantum dot system in a photon cavity'. Together they form a unique fingerprint.

Cite this