Pub Date : 1999-09-01DOI: 10.1088/1004-423X/8/9/003
Xiaohui Zhang, S. Ke
This paper presents a four-dimensional nonlinear dynamical system. By the numerical simulation the hyperchaotic attractor, Lyapunov exponents and Lyapunov dimension are obtained, also it is confirmed that hyperchaos can be driven in the system described by the equation. The control action of the periodic perturbation on the autonomous hyperchaotic system is studied, and a control rule is obtained which indicates the relationship of the control action and the frequency characteristics after degeneration of the system. Finaly the circuit implementation of the dynamical system is given.
{"title":"THE CONTROL ACTION OF THE PERIODIC PERTURBATION ON A HYPERCHAOTIC SYSTEM","authors":"Xiaohui Zhang, S. Ke","doi":"10.1088/1004-423X/8/9/003","DOIUrl":"https://doi.org/10.1088/1004-423X/8/9/003","url":null,"abstract":"This paper presents a four-dimensional nonlinear dynamical system. By the numerical simulation the hyperchaotic attractor, Lyapunov exponents and Lyapunov dimension are obtained, also it is confirmed that hyperchaos can be driven in the system described by the equation. The control action of the periodic perturbation on the autonomous hyperchaotic system is studied, and a control rule is obtained which indicates the relationship of the control action and the frequency characteristics after degeneration of the system. Finaly the circuit implementation of the dynamical system is given.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123329222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-09-01DOI: 10.1088/1004-423X/8/9/001
Xu Xiu-Wei, Ren Ting-qi, Liu Sheng-dian
According to generalized linear quantum transformation theory, we give the exact expression of the evolution operator, wave function and expectation value of observable quantity for one-dimensional quantum oscillator with a variable frequency: ω(t) = (ω0, β > 0).
{"title":"Analytic solution for one-dimensional quantum oscillator with a variable frequency","authors":"Xu Xiu-Wei, Ren Ting-qi, Liu Sheng-dian","doi":"10.1088/1004-423X/8/9/001","DOIUrl":"https://doi.org/10.1088/1004-423X/8/9/001","url":null,"abstract":"According to generalized linear quantum transformation theory, we give the exact expression of the evolution operator, wave function and expectation value of observable quantity for one-dimensional quantum oscillator with a variable frequency: ω(t) = (ω0, β > 0).","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131138802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-09-01DOI: 10.1088/1004-423X/8/9/008
Liu Xiaomei, Yang Min, Lü Zhe, Pei-ze Li, L. Jiang, Su Wenhui
La1-xSrxCrO3 nanoparticles were prepared by the sol-gel method. The sintering temperature of the samples could be decreased to about 400 K. The crystal structures of La1-xSrxCrO3 at room temperature are all of the othorhombic perovskite GdFeO3-type (x ≤ 0.4). And the electrical conductivity increases with x, but when x > 0.3 it decreases. The higher the sintering temperature, the better the electrical conductivity, because the grain size of the examples increases with increasing sintering temperature.
{"title":"A STUDY ON SYNTHESIS OF La 1-x Sr x CrO 3 BY SOL-GEL AND THEIR ELECTRICAL PROPERTIES","authors":"Liu Xiaomei, Yang Min, Lü Zhe, Pei-ze Li, L. Jiang, Su Wenhui","doi":"10.1088/1004-423X/8/9/008","DOIUrl":"https://doi.org/10.1088/1004-423X/8/9/008","url":null,"abstract":"La1-xSrxCrO3 nanoparticles were prepared by the sol-gel method. The sintering temperature of the samples could be decreased to about 400 K. The crystal structures of La1-xSrxCrO3 at room temperature are all of the othorhombic perovskite GdFeO3-type (x ≤ 0.4). And the electrical conductivity increases with x, but when x > 0.3 it decreases. The higher the sintering temperature, the better the electrical conductivity, because the grain size of the examples increases with increasing sintering temperature.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115661891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-09-01DOI: 10.1088/1004-423X/8/9/009
Yang Shi-e, Jia Yu, Ma Bing-xian, Shen San-Guo, Fan Xi-Qing
By using the combination of the first-nearest neighbor tight-binding model sp3s* and Green function method in the frame of the scattering theory, we studied the electronic structure of ZnTe/CdSe(100) heterojunction with cation layers interchange across ZnSe-like or CdTe-like interface, and presented the interface band structures and wavevector-resolved interface layer densities of states. By comparing with the electronic states of ideal interfaces, we analyzed the nature and origins of all interface states, and discussed the influence of atom layers interchange on interface electronic structure.
{"title":"ELECTRONIC STRUCTURE OF THE ZnTe/CdSe(100) INTERFACES WITH ATOM INTERCHANGE","authors":"Yang Shi-e, Jia Yu, Ma Bing-xian, Shen San-Guo, Fan Xi-Qing","doi":"10.1088/1004-423X/8/9/009","DOIUrl":"https://doi.org/10.1088/1004-423X/8/9/009","url":null,"abstract":"By using the combination of the first-nearest neighbor tight-binding model sp3s* and Green function method in the frame of the scattering theory, we studied the electronic structure of ZnTe/CdSe(100) heterojunction with cation layers interchange across ZnSe-like or CdTe-like interface, and presented the interface band structures and wavevector-resolved interface layer densities of states. By comparing with the electronic states of ideal interfaces, we analyzed the nature and origins of all interface states, and discussed the influence of atom layers interchange on interface electronic structure.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126181965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-09-01DOI: 10.1088/1004-423X/8/9/007
Weng Ming-qi, Wu Hang-sheng
The mobility of a two-dimensional electron gas in GaAs-AlGaAs heterojunction is recomputed through solving numerically the balance equation. The peculiarity of the present study lies in that a new expression for the distribution function and the renormalized phonon frequency are used in the computation. Compared with those reported by previous authors, our result shows better agreement with the experimental data.
{"title":"Two-dimensional hot-electron transport in GaAs-AlGaAs heterojunctions","authors":"Weng Ming-qi, Wu Hang-sheng","doi":"10.1088/1004-423X/8/9/007","DOIUrl":"https://doi.org/10.1088/1004-423X/8/9/007","url":null,"abstract":"The mobility of a two-dimensional electron gas in GaAs-AlGaAs heterojunction is recomputed through solving numerically the balance equation. The peculiarity of the present study lies in that a new expression for the distribution function and the renormalized phonon frequency are used in the computation. Compared with those reported by previous authors, our result shows better agreement with the experimental data.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124609998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-09-01DOI: 10.1088/1004-423X/8/9/010
Wanqing Yang, H. Wen, Y. Ni, Zhong-xian Zhao
Hole-overdoped Bi2Sr2-xLaxCuO6+δ single crystals with two coexistent superconducting transitions have been intensively studied by measuring the dc magnetic susceptibility. It is found that the coexistence of these two phases cannot be attributed to any chemical or vortex dynamical effect but to some intrinsic driving force, such as the electronic-driven phase separation. Furthermore, the upper critical fields of the two phases behave in a rather different way; that is, one of them shows a "normal Hc2 behavior" which can be described by the critical fluctuation theory, while the other exhibits an "anomalous Hc2 behavior" and can be well explained by a recent theory based on an assumption of a Josephson-coupling origin, indicating a strong evidence of Josephson-coupling origin for the upward curvature of the so-called Hc2 in high Tc superconductors.
{"title":"Phase separation and Josephson-coupling origin for the anomalous H c2 behavior in overdoped Bi 2 Sr 2-x La x CuO 6+δ crystals","authors":"Wanqing Yang, H. Wen, Y. Ni, Zhong-xian Zhao","doi":"10.1088/1004-423X/8/9/010","DOIUrl":"https://doi.org/10.1088/1004-423X/8/9/010","url":null,"abstract":"Hole-overdoped Bi2Sr2-xLaxCuO6+δ single crystals with two coexistent superconducting transitions have been intensively studied by measuring the dc magnetic susceptibility. It is found that the coexistence of these two phases cannot be attributed to any chemical or vortex dynamical effect but to some intrinsic driving force, such as the electronic-driven phase separation. Furthermore, the upper critical fields of the two phases behave in a rather different way; that is, one of them shows a \"normal Hc2 behavior\" which can be described by the critical fluctuation theory, while the other exhibits an \"anomalous Hc2 behavior\" and can be well explained by a recent theory based on an assumption of a Josephson-coupling origin, indicating a strong evidence of Josephson-coupling origin for the upward curvature of the so-called Hc2 in high Tc superconductors.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131136766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"BOUND STATES OF THE KLEIN-GORDON EQUATION WITH VECTOR AND SCALAR WOOD-SAXON POTENTIALS","authors":"Hou Chunfeng, Zhou Zhong-xiang, Li Yan","doi":"10.1088/1004-423X/8/8/001","DOIUrl":"https://doi.org/10.1088/1004-423X/8/8/001","url":null,"abstract":"The S-wave Klein-Gordon equation with vector and scalar Wood-Saxon potentials is solved, and the energy levels are given through an equation.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133371720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-08-20DOI: 10.1088/1004-423X/8/8/010
Wang Hai-long, Zhu Hai-jun, Feng Songlin, Ning Dong, Wang Hui, W. Xiaodong, Jiang Desheng
Low-temperature photoluminescence studies have been performed on Si-doped and Be-doped self-organized InAs/GaAs quantum dot (QD) samples to investigate the effect of doping. When Si or Be is doped into the sample, a remarkable decrease in line-width is observed. We relate this phenomenon to a model that takes the Si or Be atoms as the nucleation centers for the formation of QDs. When Si or Be is doped, more small uniform quantum dots are formed. The result will be of significance for the application of self-organized InAs quantum dots in semiconductor devices.
{"title":"Effect of dopant on the uniformity of InAs self-organized quantum dots","authors":"Wang Hai-long, Zhu Hai-jun, Feng Songlin, Ning Dong, Wang Hui, W. Xiaodong, Jiang Desheng","doi":"10.1088/1004-423X/8/8/010","DOIUrl":"https://doi.org/10.1088/1004-423X/8/8/010","url":null,"abstract":"Low-temperature photoluminescence studies have been performed on Si-doped and Be-doped self-organized InAs/GaAs quantum dot (QD) samples to investigate the effect of doping. When Si or Be is doped into the sample, a remarkable decrease in line-width is observed. We relate this phenomenon to a model that takes the Si or Be atoms as the nucleation centers for the formation of QDs. When Si or Be is doped, more small uniform quantum dots are formed. The result will be of significance for the application of self-organized InAs quantum dots in semiconductor devices.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125225822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-08-20DOI: 10.1088/1004-423X/8/8/003
Zhan Zhi-ming, L. Xianfeng, Zhou Shi-kang
We have established the master equation for the micromaser with the ultra-cold Λ-type three-level atoms and studied the photon statistics of the micromaser field. We find that as the atoms become colder, the change of the mean photon-number and the normalized standard deviation become more regular, and their resonance peaks become sharper. For zero-temperature cavity, there are some regions in which the photon statistics are sub-Poissonian. With the increase of the cavity temperature, both the mean photon-number and the normalized standard deviation increase. When the cavity temperature is high enough, the sub-Poissonian property may disappear.
{"title":"PHOTON STATISTICS OF THE MICROMASER WITH ULTRA COLD Λ-TYPE THREE-LEVEL ATOMS","authors":"Zhan Zhi-ming, L. Xianfeng, Zhou Shi-kang","doi":"10.1088/1004-423X/8/8/003","DOIUrl":"https://doi.org/10.1088/1004-423X/8/8/003","url":null,"abstract":"We have established the master equation for the micromaser with the ultra-cold Λ-type three-level atoms and studied the photon statistics of the micromaser field. We find that as the atoms become colder, the change of the mean photon-number and the normalized standard deviation become more regular, and their resonance peaks become sharper. For zero-temperature cavity, there are some regions in which the photon statistics are sub-Poissonian. With the increase of the cavity temperature, both the mean photon-number and the normalized standard deviation increase. When the cavity temperature is high enough, the sub-Poissonian property may disappear.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121006254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An exact direct perturbation theory of nonlinear Schrodinger equation with corrections is developed under the condition that the initial value of the perturbed solution is equal to the value of an exact multisoliton solution at a particular time. After showing the squared Jost functions are the eigenfunctions of the linearized operator with a vanishing eigenvalue, suitable definitions of adjoint functions and inner product are introduced. Orthogonal relations are derived and the expansion of the unity in terms of the squared Jost functions is naturally implied. The completeness of the squared Jost functions is shown by the generalized Marchenko equation. As an example, the evolution of a Raman loss compensated soliton in an optical fiber is treated.
{"title":"A direct perturbation theory of the nonlinear Schrödinger equation with corrections","authors":"Chen Shi-rong, Chen Zhi-de, Yuan Xian-zhang, Huang Nian-ning","doi":"10.1088/1004-423X/8/8/006","DOIUrl":"https://doi.org/10.1088/1004-423X/8/8/006","url":null,"abstract":"An exact direct perturbation theory of nonlinear Schrodinger equation with corrections is developed under the condition that the initial value of the perturbed solution is equal to the value of an exact multisoliton solution at a particular time. After showing the squared Jost functions are the eigenfunctions of the linearized operator with a vanishing eigenvalue, suitable definitions of adjoint functions and inner product are introduced. Orthogonal relations are derived and the expansion of the unity in terms of the squared Jost functions is naturally implied. The completeness of the squared Jost functions is shown by the generalized Marchenko equation. As an example, the evolution of a Raman loss compensated soliton in an optical fiber is treated.","PeriodicalId":188146,"journal":{"name":"Acta Physica Sinica (overseas Edition)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128746458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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