Numerical study of photoinduced dynamics in a double-exchange model

作     者：Y. Kanamori H. Matsueda S. Ishihara 

作者机构：Department of Physics Tohoku University Sendai 980-8578 Japan Sendai National College of Technology Sendai 989-3128 Japan Core Research for Evolutional Science and Technology (CREST) Tsukuba 305-0047 Japan 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2010年第82卷第11期

页      面：115101-115101页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：JSPS [21540312, 21224008, 21740268] CREST, Tohoku University MEXT, Japan Grants-in-Aid for Scientific Research [21740268, 21224008, 21540312] Funding Source: KAKEN 

摘      要：Photoinduced spin and charge dynamics in double-exchange model are numerically studied. The Lanczos method and the density-matrix renormalization-group method are applied to one-dimensional finite-size clusters. By photon irradiation in a charge-ordered (CO) insulator associated with antiferromagnetic (AFM) correlation, both the CO and AFM correlations collapse rapidly, and appearances of new peaks inside of an insulating gap are observed in the optical spectra and the one-particle excitation spectra. Time evolutions of the spin correlation and the in-gap state are correlated with each other, and are governed by the transfer integral of conduction electrons. Results are interpreted by the charge kink/antikink picture and their effective motions which depend on the localized spin correlation. Pump-photon density dependence of spin and charge dynamics are also studied. Roles of spin degree of freedom are remarkable in a case of weak photon density. Implications of the numerical results for the pump-probe experiments in perovskite manganites are discussed.