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

2011/12/12 by V. Jovanov, T. Eissfeller, Stephan Kapfinger +11 · 2 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Electronic and Structural Properties of Oxides #Exciton #Magnetic field #Materials science #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Quantum tunnelling #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #Zeeman effect #Zeeman energy #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.85.165433

published as Phys. Rev. B 85, 165433 (2012)

arxiv created 2011/12/12 · openalex publication_date 2012/04/16 · arxiv updated 2012/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Nonlinear Zeeman splitting of neutral excitons is observed in composition-engineered In_xGa_1\ensuremath-xAs self-assembled quantum dots, and its microscopic origin is explained. Eight-band k\ifmmode⋅\else\textperiodcentered\fip 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.

Citations

• Observation and explanation of strong electrically tunable excitongfactors in composition engineered In(Ga)As quantum dots
• Impact of heavy hole-light hole coupling on optical selection rules in GaAs quantum dots

Cited by

• Phonon-assisted carrier tunneling with hyperfine-induced spin flip in coupled quantum dot systems
• Vanishing Zeeman energy in a two-dimensional hole gas