Optical Aharonov-Bohm effect on Wigner molecules in type-II semiconductor quantum dots

Rin Okuyama, Mikio Eto, Hiroyuki Hyuga

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We theoretically examine the magnetoluminescence from a trion and a biexciton in a type-II semiconductor quantum dot, in which holes are confined inside the quantum dot and electrons are in a ring-shaped region surrounding the quantum dot. First, we show that two electrons in the trion and biexciton are strongly correlated to each other, forming a Wigner molecule: Since the relative motion of electrons is frozen, they behave as a composite particle whose mass and charge are twice those of a single electron. As a result, the energy of the trion and biexciton oscillates as a function of magnetic field with half the period of the single-electron Aharonov-Bohm oscillation. Next, we evaluate the photoluminescence. Both the peak position and peak height change discontinuously at the transition of the many-body ground state, implying a possible observation of the Wigner molecule by the optical experiment.

Original languageEnglish
Article number195311
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number19
DOIs
Publication statusPublished - 2011 May 9

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Semiconductor quantum dots
quantum dots
Molecules
Electrons
molecules
electrons
particle mass
Electron transitions
Ground state
Photoluminescence
Magnetic fields
photoluminescence
oscillations
composite materials
ground state
rings
Composite materials
magnetic fields
Experiments
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Optical Aharonov-Bohm effect on Wigner molecules in type-II semiconductor quantum dots. / Okuyama, Rin; Eto, Mikio; Hyuga, Hiroyuki.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 19, 195311, 09.05.2011.

Research output: Contribution to journalArticle

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