Dynamics of indirect exciton transport by moving acoustic fields

A. Violante, K. Cohen, S. Lazić, R. Hey, R. Rapaport, P. V. Santos

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


We report on the modulation of indirect excitons (IXs) as well as their transport by moving periodic potentials produced by surface acoustic waves (SAWs). The potential modulation induced by the SAW strain modifies both the band gap and the electrostatic field in the quantum wells confining the IXs, leading to changes in their energy. In addition, this potential captures and transports IXs over several hundreds of μm. While the IX packets keep to a great extent their spatial shape during transport by the moving potential, the effective transport velocity is lower than the SAW group velocity and increases with the SAW amplitude. This behavior is attributed to the capture of IXs by traps along the transport path, thereby increasing the IX transit time. The experimental results are well-reproduced by an analytical model for the interaction between trapping centers and IXs during transport.

Original languageAmerican English
Article number033035
JournalNew Journal of Physics
StatePublished - Mar 2014


  • acousto-electric phenomena and surface acoustic waves
  • excitons and related phenomena
  • photoluminescence properties of materials
  • quantum wells


Dive into the research topics of 'Dynamics of indirect exciton transport by moving acoustic fields'. Together they form a unique fingerprint.

Cite this