Conventional vs unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots

B. Barman; Y. Tsai; T. Scrace; J. R. Murphy; A. N. Cartwright; J. M. Pientka; I. Zutic; B. D. McCombe; A. Petrou; I. R. Sellers; R. Oszwaldowski; A. Petukhov; W. C. Fan; Wu-Ching Chou; C. S. Yang

doi:10.1117/12.2064339

Conventional vs unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots

B. Barman, Y. Tsai, T. Scrace, J. R. Murphy, A. N. Cartwright, J. M. Pientka, I. Zutic, B. D. McCombe, A. Petrou, I. R. Sellers, R. Oszwaldowski, A. Petukhov, W. C. Fan, Wu-Ching Chou, C. S. Yang

Department of Electrophysics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

We used time resolved photoluminescence (TRPL) spectroscopy to compare the properties of magnetic polarons in two related, spatially indirect, II-VI epitaxially grown quantum dot systems. In sample A (ZnMnTe/ZnSe), the photo-excited holes are confined in the magnetic ZnMnTe quantum dots (QDs), while the electrons remain in the surrounding non-magnetic ZnSe matrix. In sample B (ZnTe/ZnMnSe) on the other hand, the holes are confined in the non-magnetic ZnTe QDs and the electrons move in the magnetic ZnMnSe matrix. The magnetic polaron formation energies, E_MP, in these samples were measured from the temporal red-shift of the excitonic emission peak. The magnetic polarons in the two samples exhibit distinct characteristics. In sample A, the magnetic polaron is strongly bound with E_MP = 35 meV. Furthermore, E_MP has unconventionally weak dependence of on both temperature T and magnetic field B_appl. In contrast, magnetic polarons in sample B show conventional characteristics with E_MP decreasing with increasing temperature and increasing external magnetic field. We attribute the difference in magnetic polaron properties between the two types of QDs to the difference in the location of the Mn ions in the respective structures.

Original language	English
Title of host publication	Spintronics VII
Editors	Henri-Jean Drouhin, Jean-Eric Wegrowe, Manijeh Razeghi
Publisher	SPIE
ISBN (Electronic)	9781628411942
DOIs	https://doi.org/10.1117/12.2064339
State	Published - 2014
Event	Spintronics VII - San Diego, United States Duration: 17 Aug 2014 → 21 Aug 2014

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9167
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Spintronics VII
Country/Territory	United States
City	San Diego
Period	17/08/14 → 21/08/14

Keywords

Exchange interaction
Magnetic polaron dynamics
Magnetic quantum dots

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10.1117/12.2064339

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Barman, B., Tsai, Y., Scrace, T., Murphy, J. R., Cartwright, A. N., Pientka, J. M., Zutic, I., McCombe, B. D., Petrou, A., Sellers, I. R., Oszwaldowski, R., Petukhov, A., Fan, W. C., Chou, W.-C., & Yang, C. S. (2014). Conventional vs unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots. In H.-J. Drouhin, J.-E. Wegrowe, & M. Razeghi (Eds.), Spintronics VII Article 91670L (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9167). SPIE. https://doi.org/10.1117/12.2064339

@inproceedings{cdeacf9d285943f3b842c47bf7331dca,

title = "Conventional vs unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots",

abstract = "We used time resolved photoluminescence (TRPL) spectroscopy to compare the properties of magnetic polarons in two related, spatially indirect, II-VI epitaxially grown quantum dot systems. In sample A (ZnMnTe/ZnSe), the photo-excited holes are confined in the magnetic ZnMnTe quantum dots (QDs), while the electrons remain in the surrounding non-magnetic ZnSe matrix. In sample B (ZnTe/ZnMnSe) on the other hand, the holes are confined in the non-magnetic ZnTe QDs and the electrons move in the magnetic ZnMnSe matrix. The magnetic polaron formation energies, EMP, in these samples were measured from the temporal red-shift of the excitonic emission peak. The magnetic polarons in the two samples exhibit distinct characteristics. In sample A, the magnetic polaron is strongly bound with EMP = 35 meV. Furthermore, EMP has unconventionally weak dependence of on both temperature T and magnetic field Bappl. In contrast, magnetic polarons in sample B show conventional characteristics with EMP decreasing with increasing temperature and increasing external magnetic field. We attribute the difference in magnetic polaron properties between the two types of QDs to the difference in the location of the Mn ions in the respective structures.",

keywords = "Exchange interaction, Magnetic polaron dynamics, Magnetic quantum dots",

author = "B. Barman and Y. Tsai and T. Scrace and Murphy, {J. R.} and Cartwright, {A. N.} and Pientka, {J. M.} and I. Zutic and McCombe, {B. D.} and A. Petrou and Sellers, {I. R.} and R. Oszwaldowski and A. Petukhov and Fan, {W. C.} and Wu-Ching Chou and Yang, {C. S.}",

note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; Spintronics VII ; Conference date: 17-08-2014 Through 21-08-2014",

year = "2014",

doi = "10.1117/12.2064339",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE",

editor = "Henri-Jean Drouhin and Jean-Eric Wegrowe and Manijeh Razeghi",

booktitle = "Spintronics VII",

address = "美國",

}

Barman, B, Tsai, Y, Scrace, T, Murphy, JR, Cartwright, AN, Pientka, JM, Zutic, I, McCombe, BD, Petrou, A, Sellers, IR, Oszwaldowski, R, Petukhov, A, Fan, WC, Chou, W-C & Yang, CS 2014, Conventional vs unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots. in H-J Drouhin, J-E Wegrowe & M Razeghi (eds), Spintronics VII., 91670L, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9167, SPIE, Spintronics VII, San Diego, United States, 17/08/14. https://doi.org/10.1117/12.2064339

Conventional vs unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots. / Barman, B.; Tsai, Y.; Scrace, T. et al.
Spintronics VII. ed. / Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi. SPIE, 2014. 91670L (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9167).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Conventional vs unconventional magnetic polarons

T2 - Spintronics VII

AU - Barman, B.

AU - Tsai, Y.

AU - Scrace, T.

AU - Murphy, J. R.

AU - Cartwright, A. N.

AU - Pientka, J. M.

AU - Zutic, I.

AU - McCombe, B. D.

AU - Petrou, A.

AU - Sellers, I. R.

AU - Oszwaldowski, R.

AU - Petukhov, A.

AU - Fan, W. C.

AU - Chou, Wu-Ching

AU - Yang, C. S.

PY - 2014

Y1 - 2014

N2 - We used time resolved photoluminescence (TRPL) spectroscopy to compare the properties of magnetic polarons in two related, spatially indirect, II-VI epitaxially grown quantum dot systems. In sample A (ZnMnTe/ZnSe), the photo-excited holes are confined in the magnetic ZnMnTe quantum dots (QDs), while the electrons remain in the surrounding non-magnetic ZnSe matrix. In sample B (ZnTe/ZnMnSe) on the other hand, the holes are confined in the non-magnetic ZnTe QDs and the electrons move in the magnetic ZnMnSe matrix. The magnetic polaron formation energies, EMP, in these samples were measured from the temporal red-shift of the excitonic emission peak. The magnetic polarons in the two samples exhibit distinct characteristics. In sample A, the magnetic polaron is strongly bound with EMP = 35 meV. Furthermore, EMP has unconventionally weak dependence of on both temperature T and magnetic field Bappl. In contrast, magnetic polarons in sample B show conventional characteristics with EMP decreasing with increasing temperature and increasing external magnetic field. We attribute the difference in magnetic polaron properties between the two types of QDs to the difference in the location of the Mn ions in the respective structures.

AB - We used time resolved photoluminescence (TRPL) spectroscopy to compare the properties of magnetic polarons in two related, spatially indirect, II-VI epitaxially grown quantum dot systems. In sample A (ZnMnTe/ZnSe), the photo-excited holes are confined in the magnetic ZnMnTe quantum dots (QDs), while the electrons remain in the surrounding non-magnetic ZnSe matrix. In sample B (ZnTe/ZnMnSe) on the other hand, the holes are confined in the non-magnetic ZnTe QDs and the electrons move in the magnetic ZnMnSe matrix. The magnetic polaron formation energies, EMP, in these samples were measured from the temporal red-shift of the excitonic emission peak. The magnetic polarons in the two samples exhibit distinct characteristics. In sample A, the magnetic polaron is strongly bound with EMP = 35 meV. Furthermore, EMP has unconventionally weak dependence of on both temperature T and magnetic field Bappl. In contrast, magnetic polarons in sample B show conventional characteristics with EMP decreasing with increasing temperature and increasing external magnetic field. We attribute the difference in magnetic polaron properties between the two types of QDs to the difference in the location of the Mn ions in the respective structures.

KW - Exchange interaction

KW - Magnetic polaron dynamics

KW - Magnetic quantum dots

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U2 - 10.1117/12.2064339

DO - 10.1117/12.2064339

M3 - Conference contribution

AN - SCOPUS:84923052723

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Spintronics VII

A2 - Drouhin, Henri-Jean

A2 - Wegrowe, Jean-Eric

A2 - Razeghi, Manijeh

PB - SPIE

Y2 - 17 August 2014 through 21 August 2014

ER -

Conventional vs unconventional magnetic polarons: ZnMnTe/ZnSe and ZnTe/ZnMnSe quantum dots

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Keywords

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