Many-Body States in a Quantum Dot under High Magnetic Fields

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Abstract

Many-body electronic states in a quantum dot are studied under high magnetic fields, using the exact diagonalization method. The magnetic field dependence of low-lying excited states as well as the ground state is calculated, which is in good agreement with experimental results of Coulomb oscillation. The maximum density droplet (MDD), in which all the electrons are completely spin-polarized and accommodated in the lowest levels, appears in a range of the magnetic field. The range is narrower for larger number of electrons in the dot. Under higher magnetic fields, the MDD state is replaced by a new ground state in which electrons are strongly correlated to each other. The correlation effect considerably reduces the peak heights of the conductance.

Original languageEnglish
Pages (from-to)376-379
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume38
Issue number1 B
Publication statusPublished - 1999

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Semiconductor quantum dots
quantum dots
Magnetic fields
magnetic fields
Ground state
Electrons
electrons
ground state
Electronic states
Excited states
oscillations
electronics
excitation

Keywords

  • Coulomb blockade
  • Coulomb oscillation
  • Electronic correlation
  • Exact diagonalization
  • Maximum density droplet
  • Quantum dot

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Engineering(all)

Cite this

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T1 - Many-Body States in a Quantum Dot under High Magnetic Fields

AU - Eto, Mikio

PY - 1999

Y1 - 1999

N2 - Many-body electronic states in a quantum dot are studied under high magnetic fields, using the exact diagonalization method. The magnetic field dependence of low-lying excited states as well as the ground state is calculated, which is in good agreement with experimental results of Coulomb oscillation. The maximum density droplet (MDD), in which all the electrons are completely spin-polarized and accommodated in the lowest levels, appears in a range of the magnetic field. The range is narrower for larger number of electrons in the dot. Under higher magnetic fields, the MDD state is replaced by a new ground state in which electrons are strongly correlated to each other. The correlation effect considerably reduces the peak heights of the conductance.

AB - Many-body electronic states in a quantum dot are studied under high magnetic fields, using the exact diagonalization method. The magnetic field dependence of low-lying excited states as well as the ground state is calculated, which is in good agreement with experimental results of Coulomb oscillation. The maximum density droplet (MDD), in which all the electrons are completely spin-polarized and accommodated in the lowest levels, appears in a range of the magnetic field. The range is narrower for larger number of electrons in the dot. Under higher magnetic fields, the MDD state is replaced by a new ground state in which electrons are strongly correlated to each other. The correlation effect considerably reduces the peak heights of the conductance.

KW - Coulomb blockade

KW - Coulomb oscillation

KW - Electronic correlation

KW - Exact diagonalization

KW - Maximum density droplet

KW - Quantum dot

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JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes

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