Publication

Role of hole localization in the optical singularities of a two-dimensional electron gas studied by time-resolved photoluminescence

Benoît Marie Joseph Deveaud, Stefan Haacke
1997
Journal Articles

Abstract

The coexistence of localized and free holes in modulation doped InGaAs/InP quantum wells, which show Fermi edge singularities in the cw photoluminescence and excitation spectra, has been determined by picosecond time-resolved luminescence spectroscopy. A long-lived peak at the tow-energy side of the emission spectrum is observed at 5 K and weak excitation. The peak, which vanishes on either increasing the temperature at similar to 30 K or increasing the excitation density, is attributed to recombination of free electrons with localized holes. The simultaneous presence of free and localized holes explains the lineshapes observed in cw measurements and the presence of Fermi edge singularities.

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https://infoscience.epfl.ch/entities/publication/e5c8f0e8-ae26-485e-af63-7ffc683af9a4

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Benoît Marie Joseph Deveaud, Stefan Haacke
1997
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e5c8f0e8-ae26-485e-af63-7ffc683af9a4

About this result

Related concepts (32)

Electron hole

In physics, chemistry, and electronic engineering, an electron hole (often simply called a hole) is a quasiparticle denoting the lack of an electron at a position where one could exist in an atom or atomic lattice. Since in a normal atom or crystal lattice the negative charge of the electrons is balanced by the positive charge of the atomic nuclei, the absence of an electron leaves a net positive charge at the hole's location. Holes in a metal or semiconductor crystal lattice can move through the lattice as electrons can, and act similarly to positively-charged particles.

Photoluminescence

Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (i.e. photons that excite electrons to a higher energy level in an atom), hence the prefix photo-. Following excitation, various relaxation processes typically occur in which other photons are re-radiated.

Free electron model

In solid-state physics, the free electron model is a quantum mechanical model for the behaviour of charge carriers in a metallic solid. It was developed in 1927, principally by Arnold Sommerfeld, who combined the classical Drude model with quantum mechanical Fermi–Dirac statistics and hence it is also known as the Drude–Sommerfeld model.

Related publications (19)

Role of hole localization in the optical singularities of a two-dimensional electron gas studied by time-resolved photoluminescence

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