Theory of spin waves in diluted-magnetic-semiconductor quantum wells -: art. no. 045205

被引：12
作者：
Frustaglia, D
König, J
MacDonald, AH
机构：
[1] Univ Karlsruhe, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany
[2] INFM, NEST, I-56126 Pisa, Italy
[3] Scuola Normale Super Pisa, I-56126 Pisa, Italy
[4] Ruhr Univ Bochum, Inst Theoret Phys 3, D-44780 Bochum, Germany
[5] Univ Texas, Dept Phys, Austin, TX 78712 USA
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 04期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevB.70.045205
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a theory of collective spin excitations in diluted-magnetic-semiconductor quantum wells in which local magnetic moments are coupled via a quasi-two-dimensional gas of electrons or holes. In the case of a ferromagnetic state with partly spin-polarized electrons, we find that the Goldstone collective mode has anomalous k(4) dispersion and that for symmetric quantum wells odd parity modes do not disperse at all. We discuss the gap in the collective excitation spectrum which appears when spin-orbit interactions are included.
引用
收藏
页码：045205 / 1
页数：13
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