Magnetic phases of magnetic polarons in diluted magnetic semiconductor nanocrystals

Shun-Jen Cheng*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


We present theoretical studies of magnetism in II-VI magnetic nanocrystals (NCs) containing single electron coupled to substitutional magnetic ions Mn 2+. By using exact diagonalization techniques, we explore the magnetic phases of magnetic polarons in NCs doped with few Mn2+ ions, as functions of NC size, Mn number and positions. We show that ferromagnetic magnetic polarons (MPs) are stably formed in small magnetic NCs due to strong quantum confinement. By contrast, magnetic polarons with short ranged Mn-clusters in larger NCs exhibit various distinct magnetic phases, from ferromagnetism (FM) to anti-ferromagnetism (AF), sensitively depending on NC size. The stability of magnetic polarons in NCs with arbitrary number of Mn ions are analyzed within a proposed solvable model, supported by the numerical results calculated by using local mean field theory (MFT).

Original languageEnglish
Pages (from-to)829-832
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number4
StatePublished - 30 Sep 2009
Event5th International Conference on Semiconductor Quantum Dots, QD 2008 - Gyeongju, Korea, Republic of
Duration: 11 May 200816 May 2008

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