Dynamics of indirect exciton transport by moving acoustic fields

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,...

Full description

Saved in:
Bibliographic Details
Published in:New journal of physics 2014-03, Vol.16 (3), p.33035-19
Main Authors: Violante, A, Cohen, K, Lazi, S, Hey, R, Rapaport, R, Santos, P V
Format: Article
Language:English
Subjects:
acousto-electric phenomena and surface acoustic waves
Confining
Electric fields
Electrostatic fields
Excitation
Excitons
excitons and related phenomena
Group velocity
Mathematical analysis
Modulation
photoluminescence properties of materials
Physics
Quantum wells
Saws
Surface acoustic waves
Transit time
Transport
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 m. 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.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/16/3/033035