Highly nonlinear excitonic Zeeman spin splitting in composition-engineered artificial atoms

Article

关键词: INAS QUANTUM DOTS;    ELECTRON-SPIN;    VALENCE BANDS;    HEAVY-HOLE;    SEMICONDUCTORS;    POLARIZATION;    RESONANCES;    WELLS;   

DOI  :  10.1103/PhysRevB.85.165433

来源: SCIE

【 摘 要 】

Nonlinear Zeeman splitting of neutral excitons is observed in composition-engineered InxGa1-x As self-assembled quantum dots, and its microscopic origin is explained. Eight-band k . p simulations, performed using realistic dot parameters extracted from cross-sectional scanning tunneling microscopy measurements, reveal that a quadratic contribution to the Zeeman energy originates from a spin-dependent mixing of heavy-and light-hole orbital states in the dot. The dilute In composition (x < 0.35) and large lateral size (40-50 nm) of the quantum dots investigated are shown to strongly enhance the nonlinear contribution to the excitonic Zeeman gap, providing a blueprint to enhance such magnetic nonlinearities via growth engineering of the quantum dots.

【 授权许可】

Free