Volume 105, Number 4, February 2014
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 March 2014|
Optical signatures of a fully dark exciton condensate
1 Institut des Nanosciences de Paris, Université Pierre et Marie Curie, CNRS - 2 pl. Jussieu, 75005 Paris, France
2 Laboratoire de Physique Statistique, Ecole Normale Supérieure, UPMC Paris 06, Université Paris Diderot, CNRS 24 rue Lhomond, 75005 Paris, France
3 Institut Universitaire de France - 103 boulevard Saint- Michel, 75005 Paris, France
4 ICFO-The Institute of Photonic Sciences - 3 Av. Carl Friedrich Gauss, 08860 Castelldefels (Barcelona), Spain
Received: 25 November 2013
Accepted: 17 February 2014
We propose optical means to reveal the presence of a dark exciton condensate that does not yield any photoluminescence at all. We show that i) the dark exciton density can be obtained from the blueshift of the excitonic absorption line induced by dark excitons; ii) the polarization of the dark condensate can be obtained from the blueshift dependence on the probe photon polarization as well as from the Faraday effect. All these effects result from carrier exchanges between dark and bright states.
PACS: 73.63.Hs – Quantum wells / 78.47.jd – Time resolved luminescence / 03.75.Hh – Static properties of condensates; thermodynamical, statistical, and structural properties
© EPLA, 2014
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