Title: Time-resolved magnetophotoluminescence studies of magnetic polaron dynamics in type-II quantum dots
Authors: Barman, B.
Oszwaldowski, R.
Schweidenback, L.
Russ, A. H.
Pientka, J. M.
Tsai, Y.
Chou, W-C.
Fan, W. C.
Murphy, J. R.
Cartwright, A. N.
Sellers, I. R.
Petukhov, A. G.
Zutic, I.
McCombe, B. D.
Petrou, A.
電子物理學系
Department of Electrophysics
Issue Date: 24-Jul-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 E-MP 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 E-MP decreasing with increasing temperature T and increasing magnetic field B. In contrast, E-MP in the (Zn, Mn)Te/ZnSe system has unconventional dependence on temperature T and magnetic field B; E-MP 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.
URI: http://dx.doi.org/10.1103/PhysRevB.92.035430
http://hdl.handle.net/11536/128029
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.92.035430
Journal: PHYSICAL REVIEW B
Volume: 92
Issue: 3
Begin Page: 0
End Page: 0
Appears in Collections:Articles


Files in This Item:

  1. cd65385abcf9fa153fb1e84b90a507ff.pdf

If it is a zip file, please download the file and unzip it, then open index.html in a browser to view the full text content.