Coexistence of free excitonic matter with exciton magnetic polarons in Cd1-x Mnx Te under nonresonant two-photon excitation

J. I. Jang, S. Mani, John B Ketterson, H. Y. Park

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Coexistence of free excitonic matter with exciton magnetic polarons (EMPs) in dilute magnetic semiconductors (DMSs) of Cd1-x Mnx Te for 0.04≤x≤0.36 is demonstrated at superfluid He temperatures under nonresonant two-photon excitation. Unlike conventional one-photon excitation, both free excitons and biexcitons are observed employing this excitation method at x=0.04. Bose stimulation of biexcitons and a metal-insulator Mott transition are also observed under strong excitation. For x≥0.2, only free excitons coexisting with EMPs are observed, which also exhibit stimulated emission under strong excitation. This implies that the Mn composition is an important kinematic parameter that affects the stability of biexcitons. Our results imply that a typical DMS system can exhibit strong optical phenomena, presumably correlated with various interesting magnetic effects, depending on excitation conditions.

Original languageEnglish (US)
Article number235211
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number23
DOIs
StatePublished - Jun 17 2008

ASJC Scopus subject areas

  • Condensed Matter Physics

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