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Drift of Electron–Hole Drops in Exciton Density Gradients
Author(s) -
Balslev I.,
Hvam J. M.
Publication year - 1974
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220650211
Subject(s) - exciton , drop (telecommunication) , radius , electron , electron hole , condensed matter physics , condensation , excitation , liquid drop , biexciton , drift velocity , electron density , diffusion , atomic physics , materials science , physics , mechanics , meteorology , thermodynamics , quantum mechanics , telecommunications , computer security , computer science
The motion of electron–hole drops is analysed when nucleated in a non‐uniform density of free excitons. The exciton condensation on the drop surface gives rise to a driving force towards regions with lower densities. This force and the internal friction of the exciton gas lead to a drift velocity which is proportional to the drop radius. In typical excitation geometries this motion is more important than drop diffusion, and the flight towards low density regions influences strongly the drop growth. It is pointed out that very large drops can be formed in a local minimum of the exciton density.