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Magnetoluminescence from trion and biexciton in type-II quantum dot.

Okuyama R, Eto M, Hyuga H - Nanoscale Res Lett (2011)

Bottom Line: Since the relative motion of electrons are frozen, the Wigner molecule behaves as a composite particle whose mass and charges are twice those of an electron.As a result, the period of AB oscillation for trion and biexciton becomes h/2e as a function of magnetic flux penetrating the ring.We find that the magnetoluminescence spectra from trion and biexciton change discontinuously as the magnetic flux increases by h/2e.PACS: 71.35.Ji, 73.21.-b, 73.21.La, 78.67.Hc.

View Article: PubMed Central - HTML - PubMed

Affiliation: Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. rokuyama@rk.phys.keio.ac.jp.

ABSTRACT
We theoretically investigate optical Aharonov-Bohm (AB) effects on trion and biexciton in the type-II semiconductor quantum dots, in which holes are localized near the center of the dot, and electrons are confined in a ring structure formed around the dot. Many-particle states are calculated numerically by the exact diagonalization method. Two electrons in trion and biexciton are strongly correlated to each other, forming a Wigner molecule. Since the relative motion of electrons are frozen, the Wigner molecule behaves as a composite particle whose mass and charges are twice those of an electron. As a result, the period of AB oscillation for trion and biexciton becomes h/2e as a function of magnetic flux penetrating the ring. We find that the magnetoluminescence spectra from trion and biexciton change discontinuously as the magnetic flux increases by h/2e.PACS: 71.35.Ji, 73.21.-b, 73.21.La, 78.67.Hc.

No MeSH data available.


The intensity of the trion luminescence peak as a function of the magnetic flux Φ. Reflecting the two-electron wave function, the intensity decreases discontinuously as Φ increases by h/2e.
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Figure 5: The intensity of the trion luminescence peak as a function of the magnetic flux Φ. Reflecting the two-electron wave function, the intensity decreases discontinuously as Φ increases by h/2e.

Mentions: Figure 5 shows the intensity of the trion peak as a function of Φ. The intensity of the biexciton peak is approximately the same. The intensity decreases discontinuously at the transition of the electronic state, and approximately takes a constant value until the next transition occurs. Roughly speaking, the height of the intensity plateaus indicates a ratio of 4:3:1:0. The intensity reflects properties of the two-electron wavefunction. This is in good agreement with our theory based on the Heitler-London approximation, in which the correlation effect between electrons is taken into account by a linear combination of two Slater determinants [10].


Magnetoluminescence from trion and biexciton in type-II quantum dot.

Okuyama R, Eto M, Hyuga H - Nanoscale Res Lett (2011)

The intensity of the trion luminescence peak as a function of the magnetic flux Φ. Reflecting the two-electron wave function, the intensity decreases discontinuously as Φ increases by h/2e.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211441&req=5

Figure 5: The intensity of the trion luminescence peak as a function of the magnetic flux Φ. Reflecting the two-electron wave function, the intensity decreases discontinuously as Φ increases by h/2e.
Mentions: Figure 5 shows the intensity of the trion peak as a function of Φ. The intensity of the biexciton peak is approximately the same. The intensity decreases discontinuously at the transition of the electronic state, and approximately takes a constant value until the next transition occurs. Roughly speaking, the height of the intensity plateaus indicates a ratio of 4:3:1:0. The intensity reflects properties of the two-electron wavefunction. This is in good agreement with our theory based on the Heitler-London approximation, in which the correlation effect between electrons is taken into account by a linear combination of two Slater determinants [10].

Bottom Line: Since the relative motion of electrons are frozen, the Wigner molecule behaves as a composite particle whose mass and charges are twice those of an electron.As a result, the period of AB oscillation for trion and biexciton becomes h/2e as a function of magnetic flux penetrating the ring.We find that the magnetoluminescence spectra from trion and biexciton change discontinuously as the magnetic flux increases by h/2e.PACS: 71.35.Ji, 73.21.-b, 73.21.La, 78.67.Hc.

View Article: PubMed Central - HTML - PubMed

Affiliation: Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. rokuyama@rk.phys.keio.ac.jp.

ABSTRACT
We theoretically investigate optical Aharonov-Bohm (AB) effects on trion and biexciton in the type-II semiconductor quantum dots, in which holes are localized near the center of the dot, and electrons are confined in a ring structure formed around the dot. Many-particle states are calculated numerically by the exact diagonalization method. Two electrons in trion and biexciton are strongly correlated to each other, forming a Wigner molecule. Since the relative motion of electrons are frozen, the Wigner molecule behaves as a composite particle whose mass and charges are twice those of an electron. As a result, the period of AB oscillation for trion and biexciton becomes h/2e as a function of magnetic flux penetrating the ring. We find that the magnetoluminescence spectra from trion and biexciton change discontinuously as the magnetic flux increases by h/2e.PACS: 71.35.Ji, 73.21.-b, 73.21.La, 78.67.Hc.

No MeSH data available.