Theory of biexcitons and biexciton-exciton cascade in graphene quantum dots

被引:23
|
作者
Ozfidan, Isil [1 ,2 ]
Korkusinski, Marek [1 ]
Hawrylak, Pawel [1 ,2 ]
机构
[1] Natl Res Council Canada, Secur & Disrupt Technol Emerging Technol Div, Quantum Theory Grp, Ottawa, ON K1A 0R6, Canada
[2] Univ Ottawa, Dept Phys, Ottawa, ON, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
OPTICAL-PROPERTIES; ENTANGLED PHOTONS; DIRAC FERMIONS; SEMICONDUCTOR; DYNAMICS; STATES;
D O I
10.1103/PhysRevB.91.115314
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a microscopic theory of biexcitons in colloidal graphene quantum dots, and we discuss the possibility of a biexciton-exciton cascade generation. Assuming a p(z) orbital on each carbon atom, the single-particle properties are described in the tight-binding model. The screened direct, exchange, and scattering matrix elements of the Coulomb matrix are calculated using Slater pz orbitals. The many-body ground and excited states are constructed as a linear combination of a finite number of electron-hole pair excitations from the Hartree-Fock ground state by exact diagonalization techniques. The exciton and biexciton states are constructed exploiting the degeneracy of the valence- and conduction-band edges. The two degenerate exciton (X) states and a corresponding biexciton (XX) state are identified for generation of the XX-X cascade in threefold-symmetric quantum dots. Finally, the Auger coupling of the XX state with the excited X states is predicted.
引用
收藏
页数:8
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