兰州大学机构库 >物理科学与技术学院
Resolving photon-shortage mystery in femtosecond magnetism
Si, MS(司明苏); Zhang, GP; Si, MS (reprint author), Indiana State Univ, Dept Phys, Terre Haute, IN 47809 USA.
2010-02-24
Source PublicationJOURNAL OF PHYSICS-CONDENSED MATTER   Impact Factor & Quartile Of Published Year  The Latest Impact Factor & Quartile
ISSN0953-8984
Volume22Issue:7Pages:-
AbstractFor nearly a decade, it has been a mystery why the small average number of photons absorbed per atom from an ultrashort laser pulse is able to induce a strong magnetization within a few hundred femtoseconds. Here we resolve this mystery by directly computing the number of photons per atom layer by layer as the light wave propagates inside the sample. We find that for all the 24 experiments considered here, each atom has more than one photon. The so-called photon shortage does not exist. By plotting the relative demagnetization change versus the number of photons absorbed per atom, we show that, depending on the experimental condition, 0.1 photon can induce about 4%-72% spin moment change. Our perturbation theory reveals that the demagnetization depends linearly on the amplitude of the laser field. In addition, we find that the transition frequency of a sample may also play a role in magnetization processes. As long as the intensity is not zero, the intensity of the laser field only affects the matching range of the transition frequencies, but not whether the demagnetization can happen or not.
Subject AreaPhysics
PublisherIOP
DOI10.1088/0953-8984/22/7/076005
Publication PlaceBRISTOL
Indexed BySCIE ; EI ; PubMed ; MEDLINE
Language英语
First Inst
Funding Project国家自然科学基金项目 ; 美国能源部项目
Project NumberUS Department of Energy [DE-FG02-06ER46304, DE-AC02-05CH11231, DE-AC02-06CH11357] ; Army Research Office [W911NF-04-1-0383] ; NSFC [10804038]
WOS IDWOS:000274244100031
Funding OrganizationNSFC ; US DOE
SubtypeArticle
EI ID20100612697363
PMID 21386402
Department[Si, M. S.;
Zhang, G. P.] Indiana State Univ, Dept Phys, Terre Haute, IN 47809 USA;
[Si, M. S.] Lanzhou Univ, Minist Educ, Key Lab Magnetism & Magnet Mat, Lanzhou 73000, Peoples R China
Citation statistics
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/104909
Collection物理科学与技术学院
兰州大学
Corresponding AuthorSi, MS (reprint author), Indiana State Univ, Dept Phys, Terre Haute, IN 47809 USA.
Recommended Citation
GB/T 7714
Si, MS,Zhang, GP,Si, MS . Resolving photon-shortage mystery in femtosecond magnetism[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2010,22(7):-.
APA Si, MS,Zhang, GP,&Si, MS .(2010).Resolving photon-shortage mystery in femtosecond magnetism.JOURNAL OF PHYSICS-CONDENSED MATTER,22(7),-.
MLA Si, MS,et al."Resolving photon-shortage mystery in femtosecond magnetism".JOURNAL OF PHYSICS-CONDENSED MATTER 22.7(2010):-.
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