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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.


Gray scale plots of the two-body density for the two-electron ground state at zero magnetic field with (a) R/aB = 0.01, (b) 0.1, (c) 1, and (d) 10. One electron is fixed at the point indicated by a circle.
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Figure 3: Gray scale plots of the two-body density for the two-electron ground state at zero magnetic field with (a) R/aB = 0.01, (b) 0.1, (c) 1, and (d) 10. One electron is fixed at the point indicated by a circle.

Mentions: to examine the electric correlation. Figure 3 shows the two-body density for the two-electron ground state at zero magnetic field with (a) R/aB = 0.01, (b) 0.1, (c) 1, and (d) 10. r0 is fixed at (R, 0), which is indicated by a circle in the plots. For R/aB ≳ 1, electrons maximize their distance to be localized at the other side in the ring, that is, a Wigner molecule is formed. Since the relative motion of electrons is frozen, the Wigner molecule behaves as a composite particle whose mass and charge are twice those of an electron. In consequence the ground-state energy oscillates with Φ by the period of about h/2e.


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

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

Gray scale plots of the two-body density for the two-electron ground state at zero magnetic field with (a) R/aB = 0.01, (b) 0.1, (c) 1, and (d) 10. One electron is fixed at the point indicated by a circle.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Gray scale plots of the two-body density for the two-electron ground state at zero magnetic field with (a) R/aB = 0.01, (b) 0.1, (c) 1, and (d) 10. One electron is fixed at the point indicated by a circle.
Mentions: to examine the electric correlation. Figure 3 shows the two-body density for the two-electron ground state at zero magnetic field with (a) R/aB = 0.01, (b) 0.1, (c) 1, and (d) 10. r0 is fixed at (R, 0), which is indicated by a circle in the plots. For R/aB ≳ 1, electrons maximize their distance to be localized at the other side in the ring, that is, a Wigner molecule is formed. Since the relative motion of electrons is frozen, the Wigner molecule behaves as a composite particle whose mass and charge are twice those of an electron. In consequence the ground-state energy oscillates with Φ by the period of about h/2e.

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.