Fluctuation and Commensurability Effect of Exciton Density Wave

Abstract

At low temperatures, indirect excitons formed at the in-plane electron-hole interface in a coupled quantum well structure undergo a spontaneous transition into a spatially modulated state. We report on the control of the instability wavelength, measurement of the dynamics of the exciton emission pattern, and observation of the fluctuation and commensurability effect of the exciton density wave. We found that fluctuations are strongly suppressed when the instability wavelength is commensurate with defect separation along the exciton density wave. The commensurability effect is also found in numerical simulations within the model describing the exciton density wave in terms of an instability due to stimulated processes.

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Cited by in corpus (9)

• Indirect excitons in van der Waals heterostructures at room temperature
• Localized bright luminescence of indirect excitons and trions in MoSe${}_2$/WSe${}_2$ van der Waals heterostructure
• Interference dislocations in condensate of indirect excitons
• Pancharatnam-Berry phase in condensate of indirect excitons
• Fragmented-condensate solid of dipolar excitons
• Theory of condensation of indirect excitons in a trap
• High-mobility indirect excitons in wide single quantum well
• Autolocalization in a dipolar exciton system
• Anisotropic superfluidity of two-dimensional excitons in a periodic potential