Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-11-13
Philos. Mag. B 81, 461 (2001)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 5 figures, submitted to Phil.Mag.B
Scientific paper
10.1080/13642810110036761
The energy spectrum of a two-dimensional electron gas (2DEG) interacting with a valence-band hole is studied in the high magnetic field limit as a function of the filling factor nu and the separation d between the electron and hole layers. For d smaller than the magnetic length lambda, the hole binds one or more electrons to form neutral (X) or charged (X-) excitons. The low-lying states can be understood in terms of Laughlin-like correlations among the constituent charged fermions (electrons and X-). For d comparable to lambda, the electron-hole interaction is not strong enough to bind a full electron, and fractionally charged excitons hQEn (bound states of a hole and one or more Laughlin quasielectrons, QE) are formed. The effect of these excitonic complexes on the photoluminescence spectrum is studied numerically for a wide range of values of nu and d.
Quinn John J.
Wojs Arkadiusz
Yi Kyung--Soo
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