Optical spectroscopy of III-VI (magnetic) semiconductor quantum dots

被引：9

作者：

Crowell, PA ^{[1
]}

Nikitin, V

Gupta, JA

Awschalom, DD

Flack, F

Samarth, N

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

来源：

PHYSICA E | 1998年 / 2卷 / 1-4期

关键词：

quantum dots; diluted magnetic semiconductors; II-VI materials;

D O I：

10.1016/S1386-9477(98)00174-X

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We have probed the magnetooptical properties of II-VI semiconductor quantum dots at low temperatures (T = 5 K) in magnetic fields up to 6 T. A layer of coherently strained CdSe dots of diameters 5-20 nm is introduced into heterostructures containing either a Zn0.8Cd0.2Se quantum well or a barrier layer of MnSe. In the quantum well structure, carriers are localized in strain fields due to the nearby quantum dot layer. The effective g-factors g* of excitons in the localized states are similar to-1.5. In contrast, g* similar to 6-7 for carriers localized in CdSe islands coupled to an adjacent MnSe barrier. The enhancement of the g-factor in this case is due to the overlap of the tails of the localized wave functions with Mn++ ions in the barrier. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：854 / 857

页数：4

共 10 条

[1] BIAXIAL-STRAIN EFFECT ON EXCITONIC TRANSITIONS E(0) AND E(0)+DELTA(0) IN THE TEMPERATURE-RANGE 4.5-200 K AND ZEEMAN SPLITTING IN ZNSE/GAAS EPILAYERS [J].

COQUILLAT, D ;

HAMDANI, F ;

LASCARAY, JP ;

BRIOT, O ;

BRIOT, N ;

AULOMBARD, RL .

PHYSICAL REVIEW B, 1993, 47 (16) :10489-10496

[2] ENHANCED SPIN INTERACTIONS IN DIGITAL MAGNETIC HETEROSTRUCTURES [J].

CROOKER, SA ;

TULCHINSKY, DA ;

LEVY, J ;

AWSCHALOM, DD ;

GARCIA, R ;

SAMARTH, N .

PHYSICAL REVIEW LETTERS, 1995, 75 (03) :505-508

[3] SPECTROSCOPY OF QUANTUM LEVELS IN CHARGE-TUNABLE INGAAS QUANTUM DOTS [J].

DREXLER, H ;

LEONARD, D ;

HANSEN, W ;

KOTTHAUS, JP ;

PETROFF, PM .

PHYSICAL REVIEW LETTERS, 1994, 73 (16) :2252-2255

[4] SELECTIVE EXCITATION OF THE PHOTOLUMINESCENCE AND THE ENERGY-LEVELS OF ULTRASMALL INGAAS/GAAS QUANTUM DOTS [J].

FAFARD, S ;

LEONARD, D ;

MERZ, JL ;

PETROFF, PM .

APPLIED PHYSICS LETTERS, 1994, 65 (11) :1388-1390

[5] Near-field optical spectroscopy of localized excitons in strained CdSe quantum dots [J].

Flack, F ;

Samarth, N ;

Nikitin, V ;

Crowell, PA ;

Shi, J ;

Levy, J ;

Awschalom, DD .

PHYSICAL REVIEW B, 1996, 54 (24) :17312-17315

[6] STRAIN-INDUCED CONFINEMENT OF CARRIERS TO QUANTUM WIRES AND DOTS WITHIN AN INGAAS-INP QUANTUM WELL [J].

KASH, K ;

BHAT, R ;

MAHONEY, DD ;

LIN, PSD ;

SCHERER, A ;

WORLOCK, JM ;

VANDERGAAG, BP ;

KOZA, M ;

GRABBE, P .

APPLIED PHYSICS LETTERS, 1989, 55 (07) :681-683

[7] DIRECT FORMATION OF QUANTUM-SIZED DOTS FROM UNIFORM COHERENT ISLANDS OF INGAAS ON GAAS-SURFACES [J].

LEONARD, D ;

KRISHNAMURTHY, M ;

REAVES, CM ;

DENBAARS, SP ;

PETROFF, PM .

APPLIED PHYSICS LETTERS, 1993, 63 (23) :3203-3205

[8] Zero-dimensional excitonic confinement in locally strained Zn1-xCdxSe quantum wells [J].

Nikitin, V ;

Crowell, PA ;

Gupta, JA ;

Awschalom, DD ;

Flack, F ;

Samarth, N .

APPLIED PHYSICS LETTERS, 1997, 71 (09) :1213-1215

[9] Zeeman effect in parabolic quantum dots [J].

Rinaldi, R ;

Giugno, PV ;

Cingolani, R ;

Lipsanen, H ;

Sopanen, M ;

Tulkki, J ;

Ahopelto, J .

PHYSICAL REVIEW LETTERS, 1996, 77 (02) :342-345

[10] MAGNETOLUMINESCENCE AND MAGNETOREFLECTANCE OF A-EXCITON OF CDS AND CDSE [J].

VENGHAUS, H ;

SUGA, S ;

CHO, K .

PHYSICAL REVIEW B, 1977, 16 (10) :4419-4428

← 1 →