Abstract：
:In the study of non-equilibrium polariton condensates it is usually assumed that the dispersion relation of polaritons is parabolic in nature. We show that considering the true non-parabolic kinetic energy of polaritons leads to significant changes in the behaviour of the condensate due to the curvature of the dispersion relation and the possibility of transfer of energy to high wavenumber components in the condensate spatial profile. We present explicit solutions for plane waves and linear excitations, and identify the differences in the theoretical predictions between the parabolic and non-parabolic mean-field models, showing the possibility of symmetry breaking in the latter. We then consider the evolution of wavepackets and show that self-localisation effects may be observed due to the curvature of the dispersion relation. Finally, we revisit the dynamics of dark soliton trains and show that additional localized density excitations may emerge in the dynamics due to the excitation of high frequency components, mimicking the appearance of near-bright solitary waves over short timescales.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Pinsker F,Ruan X,Alexander TJdoi
10.1038/s41598-017-01113-8subject
Has Abstractpub_date
2017-05-15 00:00:00pages
1891issue
1issn
2045-2322pii
10.1038/s41598-017-01113-8journal_volume
7pub_type
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