Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots

B. Barman, R. Oszwałdowski, L. Schweidenback, A. H. Russ, J. M. Pientka, Y. Tsai, W-C. Chou, W. C. Fan, J. R. Murphy, A. N. Cartwright, I. R. Sellers, A. G. Petukhov, I. Žutić, B. D. McCombe, and A. Petrou
Phys. Rev. B 92, 035430 – Published 24 July 2015

Abstract

We used continuous wave photoluminescence (cw-PL) and time-resolved photoluminescence (TR-PL) spectroscopy to compare the properties of magnetic polarons (MP) in two related spatially indirect II-VI epitaxially grown quantum dot systems. In the ZnTe/(Zn,Mn)Se system the holes are confined in the nonmagnetic ZnTe quantum dots (QDs), and the electrons reside in the magnetic (Zn,Mn)Se matrix. On the other hand, in the (Zn,Mn)Te/ZnSe system, the holes are confined in the magnetic (Zn,Mn)Te QDs, while the electrons remain in the surrounding nonmagnetic ZnSe matrix. The magnetic polaron formation energies EMP in both systems were measured from the temporal redshift of the band-edge emission. The magnetic polaron exhibits distinct characteristics depending on the location of the Mn ions. In the ZnTe/(Zn,Mn)Se system the magnetic polaron shows conventional behavior with EMP decreasing with increasing temperature T and increasing magnetic field B. In contrast, EMP in the (Zn,Mn)Te/ZnSe system has unconventional dependence on temperature T and magnetic field B; EMP is weakly dependent on T as well as on B. We discuss a possible origin for such a striking difference in the MP properties in two closely related QD systems.

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  • Received 15 January 2013
  • Revised 3 April 2015

DOI:https://doi.org/10.1103/PhysRevB.92.035430

©2015 American Physical Society

Authors & Affiliations

B. Barman1, R. Oszwałdowski1,2, L. Schweidenback1, A. H. Russ1, J. M. Pientka1,3, Y. Tsai1, W-C. Chou4, W. C. Fan4, J. R. Murphy1, A. N. Cartwright5, I. R. Sellers6, A. G. Petukhov2, I. Žutić1, B. D. McCombe1, and A. Petrou1

  • 1Department of Physics, University at Buffalo SUNY, Buffalo, New York 14260, USA
  • 2Department of Physics, South Dakota School of Mines & Technology, Rapid City, South Dakota 57701, USA
  • 3Department of Physics, St. Bonaventure University, St. Bonaventure, New York 14778, USA
  • 4Department of Electro-physics, National Chiao Tung University, Hsinchu 300, Taiwan
  • 5Department of Electrical & Electronic Engineering, University at Buffalo SUNY, Buffalo, New York 14260, USA
  • 6Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, USA

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Issue

Vol. 92, Iss. 3 — 15 July 2015

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