Seeing Quantised Polaritons without Condensation

Authors
Baumberg, JJ 

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Article
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Abstract

Exciton polaritons in high quality semiconductor microcavities can travel long macroscopic distances (>100μm) due to their ultra-light effective mass. The polaritons are repelled from the optically-pumped exciton reservoirs where they are formed, however their spatial dynamics is not as expected for point-like particles. Instead we show polaritons emitted into waveguides travel orthogonally to the repulsive potential gradient, and can only be explained if they are emitted as macroscopic delocalised quantum particles, even before they form Bose condensates.

Publication Date
Online Publication Date
Acceptance Date
2018-07-11
Keywords
Journal Title
Physical Review Letters
Journal ISSN
1079-7114
Volume Title
Publisher
APS
Sponsorship
Engineering and Physical Sciences Research Council (EP/G060649/1)
Leverhulme Trust (VP1-2013-011)
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/L027151/1)