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Time-Resolved Spectroscopy of Single Excitons Bound to Pairs of Te Isoelectronic Impurity Centers in ZnSe

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arxiv cond-mat/0503419 v1 pith:ECV33TUO submitted 2005-03-17 cond-mat.mtrl-sci

A. Muller , P. Bianucci , C. Piermarocchi , M. Fornari , I. C. Robin , R. Andre , C. K. Shih This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords excitonstime-resolvedboundcentersimpurityisoelectronicpairspeaks
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Tellurium impurity centers in ZnSe were individually probed with time-resolved photoluminescence (PL) spectroscopy. Resolution-limited peaks with an ultra-low spatial density originate in the recombination of excitons deeply bound to isolated nearest-neighbor isoelectronic Te pairs (Te2). This interpretation is confirmed by ab-initio calculations. The peaks reveal anti-bunched photon emission and a doublet structure polarized along [110] and [-110]. We analyze the time-resolved PL decay to clarify the role of the dark states in the spin relaxation and radiative recombination of single fine-structure split excitons.

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