Direct Measurements of Magnetic Polarons in Cd1–xMnx Se Nanocrystals from Resonant Photoluminescence

Rice, W. D.; Liu, W.; Pinchetti, V.; Yakovlev, D. R.; Klimov, V. I.; Crooker, S. A.

doi:10.1021/acs.nanolett.7b00421

Title: Direct Measurements of Magnetic Polarons in Cd_1–xMn_x Se Nanocrystals from Resonant Photoluminescence

Journal Article · Fri Apr 07 00:00:00 EDT 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b00421· OSTI ID:1364552

Rice, W. D. ^[1]; Liu, W. ^[2];

^[3]; Yakovlev, D. R. ^[4];

^[2];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Wyoming, Laramie, WY (United States). Dept. of Physics and Astronomy
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. degli Studi di Milano (Italy). Dipartimento di Scienza dei Materiali
Technische Univ., Dortmund (Germany); Russian Academy of Sciences (RAS), St. Petersburg (Russian Federation). Ioffe Physical Technical Inst.

In semiconductors, quantum confinement can greatly enhance the interaction between band carriers (electrons and holes) and dopant atoms. One manifestation of this enhancement is the increased stability of exciton magnetic polarons in magnetically doped nanostructures. In the limit of very strong 0D confinement that is realized in colloidal semiconductor nanocrystals, a single exciton can exert an effective exchange field B_ex on the embedded magnetic dopants that exceeds several tesla. Here we use the very sensitive method of resonant photoluminescence (PL) to directly measure the presence and properties of exciton magnetic polarons in colloidal Cd_1–xMn_xSe nanocrystals. Despite small Mn²⁺ concentrations (x = 0.4–1.6%), large polaron binding energies up to ~26 meV are observed at low temperatures via the substantial Stokes shift between the pump laser and the resonant PL maximum, indicating nearly complete alignment of all Mn²⁺ spins by B_exex ≈ 10 T in these nanocrystals, in good agreement with theoretical estimates. Further, the emission line widths provide direct insight into the statistical fluctuations of the Mn²⁺ spins. In conclusion, these resonant PL studies provide detailed insight into collective magnetic phenomena, especially in lightly doped nanocrystals where conventional techniques such as nonresonant PL or time-resolved PL provide ambiguous results.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1364552

Report Number(s):: LA-UR-17-20406

Journal Information:: Nano Letters, Vol. 17, Issue 5; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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Title: Direct Measurements of Magnetic Polarons in Cd_1–xMn_x Se Nanocrystals from Resonant Photoluminescence