Theory of excitonic artificial atoms: InGaAs/GaAs quantum dots in strong magnetic fields

被引：29

作者：

Cheng, SJ ^{[1
]}

Sheng, WD ^{[1
]}

Hawrylak, P ^{[1
]}

机构：

[1] Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.68.235330

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We develop a theory of excitonic artificial atoms in strong magnetic fields. The excitonic atoms are formed by N electrons and holes confined in a quantum dot. The single-particle levels are described by the Fock-Darwin spectrum in a magnetic field. The magnetic field induces crossing of energy levels and allows us to engineer degenerate shells. We apply exact diagonalization techniques to calculate the magnetic-field evolution of the ground state of the N-electron-hole complex and its emission spectra. We focus on degenerate shells and show that excitons condense into correlated states due to hidden symmetry. We relate the Fock-Darwin spectrum, hidden symmetries, and direct and exchange interaction among particles to the emission spectra as a function of number of electron-hole pairs (excitation power) and magnetic field.

引用

页数：10

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