A Green's function model for ferromagnetism and spin excitations of (Ga, Mn)As diluted magnetic semiconductors

Gui Bin Liu; Bang Gui Liu

doi:10.1088/1674-1056/18/11/073

A Green's function model for ferromagnetism and spin excitations of (Ga, Mn)As diluted magnetic semiconductors

Gui Bin Liu
, Bang Gui Liu^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We study (Ga, Mn)As diluted magnetic semiconductors in terms of the Ruderman-Kittel-Kasuya-Yosida quantum spin model in Green's function approach. Random distributions of the magnetic atoms are treated by using an analytical average of magnetic configurations. Average magnetic moments and spin excitation spectra as functions of temperature can be obtained by solving self-consistent equations, and the Curie temperature T_C is given explicitly. T _C is proportional to magnetic atomic concentration, and there exists a maximum for T_C as a function of carrier concentration. Applied to (Ga, Mn)As, the theoretical results are consistent with experiment and the experimental T_C can be obtained with reasonable parameters. This modelling can also be applied to other diluted magnetic semiconductors.

Original language	English
Pages (from-to)	5047-5054
Number of pages	8
Journal	Chinese Physics B
Volume	18
Issue number	11
DOIs	https://doi.org/10.1088/1674-1056/18/11/073
Publication status	Published - 2009
Externally published	Yes

Keywords

Diluted magnetic semiconductor
Green's function
Ruderman-Kittel-Kasuya- Yosida

Access to Document

10.1088/1674-1056/18/11/073

Cite this

@article{d58d77e56613479fa1af21c4e6eb2d0f,

title = "A Green's function model for ferromagnetism and spin excitations of (Ga, Mn)As diluted magnetic semiconductors",

abstract = "We study (Ga, Mn)As diluted magnetic semiconductors in terms of the Ruderman-Kittel-Kasuya-Yosida quantum spin model in Green's function approach. Random distributions of the magnetic atoms are treated by using an analytical average of magnetic configurations. Average magnetic moments and spin excitation spectra as functions of temperature can be obtained by solving self-consistent equations, and the Curie temperature TC is given explicitly. T C is proportional to magnetic atomic concentration, and there exists a maximum for TC as a function of carrier concentration. Applied to (Ga, Mn)As, the theoretical results are consistent with experiment and the experimental TC can be obtained with reasonable parameters. This modelling can also be applied to other diluted magnetic semiconductors.",

keywords = "Diluted magnetic semiconductor, Green's function, Ruderman-Kittel-Kasuya- Yosida",

author = "Liu, \{Gui Bin\} and Liu, \{Bang Gui\}",

year = "2009",

doi = "10.1088/1674-1056/18/11/073",

language = "English",

volume = "18",

pages = "5047--5054",

journal = "Chinese Physics B",

issn = "1674-1056",

publisher = "Institute of Physics",

number = "11",

}

TY - JOUR

T1 - A Green's function model for ferromagnetism and spin excitations of (Ga, Mn)As diluted magnetic semiconductors

AU - Liu, Gui Bin

AU - Liu, Bang Gui

PY - 2009

Y1 - 2009

N2 - We study (Ga, Mn)As diluted magnetic semiconductors in terms of the Ruderman-Kittel-Kasuya-Yosida quantum spin model in Green's function approach. Random distributions of the magnetic atoms are treated by using an analytical average of magnetic configurations. Average magnetic moments and spin excitation spectra as functions of temperature can be obtained by solving self-consistent equations, and the Curie temperature TC is given explicitly. T C is proportional to magnetic atomic concentration, and there exists a maximum for TC as a function of carrier concentration. Applied to (Ga, Mn)As, the theoretical results are consistent with experiment and the experimental TC can be obtained with reasonable parameters. This modelling can also be applied to other diluted magnetic semiconductors.

AB - We study (Ga, Mn)As diluted magnetic semiconductors in terms of the Ruderman-Kittel-Kasuya-Yosida quantum spin model in Green's function approach. Random distributions of the magnetic atoms are treated by using an analytical average of magnetic configurations. Average magnetic moments and spin excitation spectra as functions of temperature can be obtained by solving self-consistent equations, and the Curie temperature TC is given explicitly. T C is proportional to magnetic atomic concentration, and there exists a maximum for TC as a function of carrier concentration. Applied to (Ga, Mn)As, the theoretical results are consistent with experiment and the experimental TC can be obtained with reasonable parameters. This modelling can also be applied to other diluted magnetic semiconductors.

KW - Diluted magnetic semiconductor

KW - Green's function

KW - Ruderman-Kittel-Kasuya- Yosida

UR - https://www.scopus.com/pages/publications/70449705968

U2 - 10.1088/1674-1056/18/11/073

DO - 10.1088/1674-1056/18/11/073

M3 - Article

AN - SCOPUS:70449705968

SN - 1674-1056

VL - 18

SP - 5047

EP - 5054

JO - Chinese Physics B

JF - Chinese Physics B

IS - 11

ER -

A Green's function model for ferromagnetism and spin excitations of (Ga, Mn)As diluted magnetic semiconductors

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this