Peter T. Landsberg

Beattie, A. R.

doi:10.1016/0022-3697(88)90188-6

Cited by 4 publications

(5 citation statements)

References 115 publications

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“…The elementary act of Auger recombination requires three particles to participate. If all these particles are free carriers then the Auger process has a certain energy threshold [55] as a consequence of momentum and energy conservation laws. Such a threshold makes the Auger mechanism ineffective at low temperatures.…”

Section: General Considerationsmentioning

confidence: 99%

Formation and dynamics of muonium centres in semiconductors—a new approach

Storchak¹,

Eshchenko²,

Brewer³

2004

J. Phys.: Condens. Matter

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Various processes of muonium atom formation in semiconductors via electron capture by a positive muon have been studied using µSR techniques, including those with applied electric field. Experiments in GaAs, GaP and CdS suggest that the electron is initially captured into a highly excited state, from which the cascade down to the muonium ground state goes through an intermediate weakly bound state determined by the electron effective mass and the dielectric constant of the host. The electronic structure of this weakly bound state is shown to be hydrogenic. The nature of the final (on the µSR timescale) muonium state depends on the energy releasing mechanisms in the cascade process. We suggest that muonium dynamics in semiconductors (including the effects of electric and magnetic fields and temperature) reflect the electron dynamics in weakly bound muonium state(s) in which the electron is delocalized over distances of about 100 Å.

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Section: General Considerationsmentioning

confidence: 99%

Formation and dynamics of muonium centres in semiconductors—a new approach

Storchak¹,

Eshchenko²,

Brewer³

2004

J. Phys.: Condens. Matter

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“…7,8, are the most important mechanisms for loss of excitons at high densities. Studies of this mechanism have been carried out on excitons in Cu 2 O [9,13], and in electron-hole plasmas [25,26] where an electron recombines and excites either another electron high in the conduction band, or a hole deep in the valence band. Detailed calculations of the Auger rates are given in Ref.…”

Section: Auger Processmentioning

confidence: 99%

Quantum saturation and condensation of excitons inCu2O: A theoretical study

1996

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Recent experiments on high density excitons in Cu2O provide evidence for degenerate quantum statistics and Bose-Einstein condensation of this nearly ideal gas. We model the time dependence of this bosonic system including exciton decay mechanisms, energy exchange with phonons, and interconversion between ortho (triplet-state) and para (singlet-state) excitons, using parameters for the excitonic decay, the coupling to acoustic and low-lying optical phonons, Auger recombination, and ortho-para interconversion derived from experiment. The single adjustable parameter in our model is the optical-phonon cooling rate for Auger and laser-produced hot excitons. We show that the orthoexcitons move along the phase boundary without crossing it (i.e., exhibit a "quantum saturation"), as a consequence of the balance of entropy changes due to cooling of excitons by phonons and heating by the non-radiative Auger two-exciton recombination process. The Auger annihilation rate for para-para collisions is much smaller than that for ortho-para and ortho-ortho collisions, explaining why, under the given experimental conditions, the paraexcitons condense while the orthoexcitons fail to do so.

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“…This process is also present in electron-hole plasmas, in which the recombination of an electron and a hole excites either an electron high in the conduction band or a hole deep in the valence band. This process, which occurs in many semiconductors, has long been studied both theoretically [81][82][83][84] and experimentally [85,86]. A similar decay process has also been observed in experiments with cold metastable He atoms, where the term "Penning collisions" is used [87].…”

Section: Review Of the Auger Processmentioning

confidence: 68%

Bose–Einstein condensation of excitons in Cu₂O: progress over 30 years

Snoke¹,

Kavoulakis²

2014

Rep. Prog. Phys.

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Experiments on Bose-Einstein condensation (BEC) of excitons in the semiconductor Cu2O started over 30 years ago, as one of the first serious attempts at exciton BEC. Early claims were based on spectroscopic signatures and transport data which have since been reinterpreted, in large part because the Auger recombination process for excitons was not well understood. Understanding of the Auger process has advanced, and recent experiments have made significant progress toward exciton BEC. We review the history of experiments on exciton BEC in Cu2O, the Auger recombination process, and the prospects for observing exciton BEC in this system in the near future.

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Peter T. Landsberg

Cited by 4 publications

References 115 publications

Formation and dynamics of muonium centres in semiconductors—a new approach

Formation and dynamics of muonium centres in semiconductors—a new approach

Quantum saturation and condensation of excitons inCu2O: A theoretical study

Bose–Einstein condensation of excitons in Cu₂O: progress over 30 years

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Peter T. Landsberg

Cited by 4 publications

References 115 publications

Formation and dynamics of muonium centres in semiconductors—a new approach

Formation and dynamics of muonium centres in semiconductors—a new approach

Quantum saturation and condensation of excitons inCu2O: A theoretical study

Bose–Einstein condensation of excitons in Cu2O: progress over 30 years

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Bose–Einstein condensation of excitons in Cu₂O: progress over 30 years