Observation of the magnetic soft mode in (Cd,Mn)Te quantum wells using spin-flip Raman scattering

被引：8

作者：

Kehl, C. ^{[1
]}

Astakhov, G. V. ^{[1
]}

Kavokin, K. V. ^{[2
]}

Kusrayev, Yu. G. ^{[2
]}

Ossau, W. ^{[1
]}

Karczewski, G. ^{[3
]}

Wojtowicz, T. ^{[3
]}

Geurts, J. ^{[1
]}

机构：

[1] Univ Wurzburg, Phys Inst EP3, D-97074 Wurzburg, Germany

[2] Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia

[3] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 24期

关键词：

cadmium compounds; g-factor; hole density; II-VI semiconductors; magnetic transitions; manganese compounds; paramagnetic resonance; Raman spectra; semiconductor quantum wells; semimagnetic semiconductors; spin dynamics; spin systems; two-dimensional hole gas; 2-DIMENSIONAL HOLE GAS; CHARGED EXCITONS; PARAMAGNETIC-RESONANCE; FERROMAGNETISM; DYNAMICS; STATES;

D O I：

10.1103/PhysRevB.80.241203

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the experimental observation of a magnetic soft mode of collective spin excitations in (Cd,Mn)Te quantum wells, containing a 2D hole gas interacting with magnetic ions. We found that with increasing hole concentration the eigenfrequency of the paramagnetic spin resonance decreases, which is predicted to occur prior to the ferromagnetic phase transition. Such a magnetic soft mode is detected in spin-flip Raman-scattering experiments as a reduction in the Mn g factor. The results are described in terms of collective dynamics of strongly coupled spin systems with positive feedback. Based on this approach the evolution of such excitations with hole concentration is calculated.

引用

页数：4

共 25 条

[1] Charged excitons in ZnSe-based quantum wells [J].

Astakhov, GV ;

Yakovlev, DR ;

Kochereshko, VP ;

Ossau, W ;

Nürnberger, J ;

Faschinger, W ;

Landwehr, G .

PHYSICAL REVIEW B, 1999, 60 (12) :R8485-R8488

[2] Binding energy of charged excitons in ZnSe-based quantum wells [J].

Astakhov, GV ;

Yakovlev, DR ;

Kochereshko, VP ;

Ossau, W ;

Faschinger, W ;

Puls, J ;

Henneberger, F ;

Crooker, SA ;

McCulloch, Q ;

Wolverson, D ;

Gippius, NA ;

Waag, A .

PHYSICAL REVIEW B, 2002, 65 (16) :1653351-16533517

[3] Light and electric field control of ferromagnetism in magnetic quantum structures [J].

Boukari, H ;

Kossacki, P ;

Bertolini, M ;

Ferrand, D ;

Cibert, J ;

Tatarenko, S ;

Wasiela, A ;

Gaj, JA ;

Dietl, T .

PHYSICAL REVIEW LETTERS, 2002, 88 (20) :4-207204

[4] Optical spin resonance and transverse spin relaxation in magnetic semiconductor quantum wells [J].

Crooker, SA ;

Awschalom, DD ;

Baumberg, JJ ;

Flack, F ;

Samarth, N .

PHYSICAL REVIEW B, 1997, 56 (12) :7574-7588

[5] Carrier-induced ferromagnetism in p-Zn1-xMnxTe -: art. no. 085201 [J].

Ferrand, D ;

Cibert, J ;

Wasiela, A ;

Bourgognon, C ;

Tatarenko, S ;

Fishman, G ;

Andrearczyk, T ;

Jaroszynski, J ;

Kolesnik, S ;

Dietl, T ;

Barbara, B ;

Dufeu, D .

PHYSICAL REVIEW B, 2001, 63 (08)

[6] HOLE SUBBANDS IN STRAINED-QUANTUM-WELL SEMICONDUCTORS IN [HHK] DIRECTIONS [J].

FISHMAN, G .

PHYSICAL REVIEW B, 1995, 52 (15) :11132-11143

[7] Observation of a ferromagnetic transition induced by two-dimensional hole gas in modulation-doped CdMnTe quantum wells [J].

Haury, A ;

Wasiela, A ;

Arnoult, A ;

Cibert, J ;

Tatarenko, S ;

Dietl, T ;

dAubigne, YM .

PHYSICAL REVIEW LETTERS, 1997, 79 (03) :511-514

[8] Bound states in optical absorption of semiconductor quantum wells containing a two-dimensional electron gas [J].

Huard, V ;

Cox, RT ;

Saminadayar, K ;

Arnoult, A ;

Tatarenko, S .

PHYSICAL REVIEW LETTERS, 2000, 84 (01) :187-190

[9] Coherent dynamics of localized spins coupled with a two-dimensional hole gas in diluted-magnetic quantum wells [J].

Kavokin, KV .

PHYSICAL REVIEW B, 1999, 59 (15) :9822-9825

[10] OBSERVATION OF NEGATIVELY CHARGED EXCITONS X- IN SEMICONDUCTOR QUANTUM-WELLS [J].

KHENG, K ;

COX, RT ;

DAUBIGNE, YM ;

BASSANI, F ;

SAMINADAYAR, K ;

TATARENKO, S .

PHYSICAL REVIEW LETTERS, 1993, 71 (11) :1752-1755

← 1 2 3 →