Time-dependent current into and through multilevel parallel quantum dots in a photon cavity

Vidar Gudmundsson, Nzar Rauf Abdullah, Anna Sitek, Hsi-Sheng Goan, Chi-Shung Tang, and Andrei Manolescu
Phys. Rev. B 95, 195307 – Published 15 May 2017

Abstract

We analyze theoretically the charging current into, and the transport current through, a nanoscale two-dimensional electron system with two parallel quantum dots embedded in a short wire placed in a photon cavity. A plunger gate is used to place specific many-body states of the interacting system in the bias window defined by the external leads. We show how the transport phenomena active in the many-level complex central system strongly depend on the gate voltage. We identify a resonant transport through the central system as the two spin components of the one-electron ground state are in the bias window. This resonant transport through the lowest energy electron states seems to a large extent independent of the detuned photon field when judged from the transport current. This could be expected in the small bias regime, but an observation of the occupancy of the states of the system reveals that this picture is not entirely true. The current does not reflect slower photon-active internal transitions bringing the system into the steady state. The number of initially present photons determines when the system reaches the real steady state. With two-electron states in the bias window we observe a more complex situation with intermediate radiative and nonradiative relaxation channels leading to a steady state with a weak nonresonant current caused by inelastic tunneling through the two-electron ground state of the system. The presence of the radiative channels makes this phenomena dependent on the number of photons initially in the cavity.

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  • Received 29 November 2016
  • Revised 14 February 2017

DOI:https://doi.org/10.1103/PhysRevB.95.195307

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Vidar Gudmundsson1,*, Nzar Rauf Abdullah2, Anna Sitek1,3, Hsi-Sheng Goan4,5,†, Chi-Shung Tang6,‡, and Andrei Manolescu7,§

  • 1Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland
  • 2Physics Department, College of Science, University of Sulaimani, Zone-501 Sulaimani, Kurdistan Region, Iraq
  • 3Department of Theoretical Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland
  • 4Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan
  • 5Center for Quantum Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
  • 6Department of Mechanical Engineering, National United University, Miaoli 36003, Taiwan
  • 7School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland

  • *vidar@hi.is
  • goan@phys.ntu.edu.tw
  • cstang@nuu.edu.tw
  • §manoles@ru.is

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Issue

Vol. 95, Iss. 19 — 15 May 2017

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