| A Green＇s function model for ferromagnetism and spin excitations of （Ga,Mn）As diluted magnetic semiconductors |
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| 引用本文： | 刘贵斌,刘邦贵.A Green＇s function model for ferromagnetism and spin excitations of （Ga,Mn）As diluted magnetic semiconductors[J].中国物理 B,2009,18(11):5047-5054. |
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| 作者姓名： | 刘贵斌 刘邦贵 |
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| 作者单位： | Institute of Physics, Chinese Academy of Sciences, Beijing
100190, China;Beijing National Laboratory for Condensed Matter Physics, Beijing
100190, China |
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| 基金项目： | Project supported by the National
Nature Science Foundation of China (Grant Nos 10774180, 90406010 and
6062109), Funds of the Chinese Academy of Sciences for Key Topics in
Innovation Engineering (Grant No KJCX2.YW.W09-5) and the National
Basic Research Program of China (Grant No 2005CB623602). |
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| 摘 要： | 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. TC 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.
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| 关 键 词： | diluted magnetic semiconductor Green’s function Ruderman–Kittel–Kasuya–Yosida |
| 收稿时间： | 5/4/2009 12:00:00 AM |
A Green's function model for ferromagnetism and spin excitations of (Ga Mn)As diluted magnetic semiconductors |
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| Liu Gui-Bin and Liu Bang-Gui.A Green's function model for ferromagnetism and spin excitations of (Ga Mn)As diluted magnetic semiconductors[J].Chinese Physics B,2009,18(11):5047-5054. |
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| Authors: | Liu Gui-Bin and Liu Bang-Gui |
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| Affiliation: | Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China |
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| 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. TC 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. |
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| Keywords: | diluted magnetic semiconductor Green's function Ruderman--Kittel--Kasuya--Yosida |
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