Energy spectra of fractional quantum Hall systems in the presence of a valence hole

Abstract

The energy spectrum of a two-dimensional electron gas (2DEG) in the fractional quantum Hall regime interacting with an optically injected valence band hole is studied as a function of the filling factor $\nu$ and the separation $d$ between the electron and hole layers. The response of the 2DEG to the hole changes abruptly at $d$ of the order of the magnetic length $\lambda$. At $d<\lambda$, the hole binds electrons to form neutral ($X$) or charged ($X^{-}$) excitons, and the photoluminescence (PL) spectrum probes the lifetimes and binding energies of these states rather than the original correlations of the 2DEG. The ``dressed exciton'' picture (in which the interaction between an exciton and the 2DEG was proposed to merely enhance the exciton mass) is questioned. Instead, the low energy states are explained in terms of Laughlin correlations between the constituent fermions (electrons and $X^{-}$'s) and the formation of two-component incompressible fluid states in the electron--hole plasma. At $d>2\lambda$, the hole binds up to two Laughlin quasielectrons (QE) of the 2DEG to form fractionally charged excitons $h$QE${}_n$. The previously found ``anyon exciton'' $h$QE${}_3$ is shown to be unstable at any value of $d$. The critical dependence of the stability of different $h$QE${}_n$ complexes on the presence of QE's in the 2DEG leads to the observed discontinuity of the PL spectrum at $\nu =\frac{1}{3}$ or $\frac{2}{3}$.

16 pages, 14 figures, submitted to PRB

References in corpus (5)

• Charged Excitons in a Dilute 2D Electron Gas in a High Magnetic Field
• Quasiparticle Interactions in Fractional Quantum Hall Systems: Justification of Different Hierarchy Schemes
• Two-dimensional charged electron-hole complexes in magnetic fields: Keeping magnetic translations preserved
• Energy spectra of fractional quantum Hall systems in the presence of a valence hole
• Energy spectra and photoluminescence of charged magneto-excitons

Cited by in corpus (12)

• Energy spectra of fractional quantum Hall systems in the presence of a valence hole
• Photoluminescence from fractional quantum Hall systems: Role of separation between electron and hole layers
• Negatively Charged Excitons and Photoluminescence in Asymmetric Quantum Well
• The Hierarchy of Incompressible Fractional Quantum Hall States
• Quasiexcitons in Incompressible Quantum Liquids
• Energy, interaction, and photoluminescence of spin-reversed quasielectrons in fractional quantum Hall systems
• Optical control over bulk excitations in fractional quantum Hall systems
• Optical excitations in compressible and incompressible two-dimensional electron liquids
• Interaction and Particle-Hole Symmetry of Laughlin Quasiparticles
• Photoluminescence of the incompressible Laughlin liquid: Excitons, charged excitons, and fractionally charged excitons
• Electron-Hole Systems in Narrow Quantum Wells: Excitonic Complexes and Photoluminescence
• Sensing the binding and unbinding of anyons at impurities