强约束二维抛物量子点：双激子还是四重子？
Strongly confined 2D parabolic quantum dot: Biexciton or Quadron?
摘要：
用非限制性Hartree-Fock方法对InAs/GaAs抛物型量子点中的激子系统进行了理论研究。得到了激子、常规双激子和四重子-双电子双空穴四粒子系统基态结合能随磁场和限制势的变化关系。结果表明，在强约束条件下，双激子的结合能为负，而四边形的结合能为正，说明抛物型量子点的强横向约束支持四边形的形成，而不是双激子的形成.
英文摘要：
Excitonic systems localized in a single InAs/GaAs parabolic quantum dot are studied theoretically using an unrestricted Hartree-Fock method. The binding energies of excitons, conventional biexcitons and quadrons - four particles system of two electrons and two holes, in the ground state have been obtained as functions of magnetic field and confinement potential. It is found that for strong confinement, while the binding energy of biexciton is negative, the binding energy of quadron is positive, suggesting the strong lateral confinement of the parabolic quantum dot supports the formation of a quadron rather than a biexciton.
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