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The European Physical Journal B - Condensed Matter and Complex Systems最新文献

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Breakdown of rotational symmetry at semiconductor interfaces: a microscopic description of valence subband mixing 半导体界面旋转对称的破坏:价子带混合的微观描述
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 2000-09-01 DOI: 10.12693/APHYSPOLA.98.303
S. Cortez, O. Krebs, P. Voisin
{"title":"Breakdown of rotational symmetry at semiconductor interfaces: a microscopic description of valence subband mixing","authors":"S. Cortez, O. Krebs, P. Voisin","doi":"10.12693/APHYSPOLA.98.303","DOIUrl":"https://doi.org/10.12693/APHYSPOLA.98.303","url":null,"abstract":"Abstract:The recently discovered in-plane optical anisotropy of [001]-grown quantum wells offers a new theoretical and experimental insight into the electronic properties of semiconductor interfaces. We first discuss the coupling of X and Y valence bands due to the breakdown of roto-inversion symmetry at a semiconductor hetero-interface, with special attention to its dependence on effective parameters such as the valence band offset. The intracell localization of Bloch functions is explained from simple theoretical arguments and evaluated numerically from a pseudo-potential microscopic model. The role of envelope functions is then considered, and we discuss the specific case of no-common atom interfaces. Experimental results and applications to interface characterization are presented. These calculations give a microscopic justification, and establish the limits of the heuristic “HBF” model.","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89433004","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}
引用次数: 16
Percolation with constraints in the highly polarizable oxide KTaO3:Li 高极化氧化物KTaO3:Li的约束渗流
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 2000-06-01 DOI: 10.1007/S100510051148
S. Prosandeev, V. Vikhnin, S. Kapphan
{"title":"Percolation with constraints in the highly polarizable oxide KTaO3:Li","authors":"S. Prosandeev, V. Vikhnin, S. Kapphan","doi":"10.1007/S100510051148","DOIUrl":"https://doi.org/10.1007/S100510051148","url":null,"abstract":"","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79366137","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}
引用次数: 6
Electrodynamics of current-biased inductive cubic networks of Josephson junctions 约瑟夫森结电流偏置感应三次网络的电动力学
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 2000-05-01 DOI: 10.1080/01418630008221956
R. De Luca
{"title":"Electrodynamics of current-biased inductive cubic networks of Josephson junctions","authors":"R. De Luca","doi":"10.1080/01418630008221956","DOIUrl":"https://doi.org/10.1080/01418630008221956","url":null,"abstract":"Abstract:The dynamical equations for the gauge-invariant superconducting phase differences across the twelve Josephson junctions placed on the sides of an inductive cubic network are derived. The electrodynamic properties of the system are studied by means of a general analytic approach. The cubic system is seen to show features similar to those of a d.c. SQUID for externally applied magnetic fields perpendicular to one cube face. Additional features are detected for different field orientations.","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75602541","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}
引用次数: 0
Energy transfer from a semiconductor quantum dot to an organic matrix 从半导体量子点到有机矩阵的能量转移
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 2000-02-01 DOI: 10.1002/1521-396X(200003)178:1<69::AID-PSSA69>3.0.CO;2-D
D. Basko, V. Agranovich, F. Bassani, G. Rocca
{"title":"Energy transfer from a semiconductor quantum dot to an organic matrix","authors":"D. Basko, V. Agranovich, F. Bassani, G. Rocca","doi":"10.1002/1521-396X(200003)178:1<69::AID-PSSA69>3.0.CO;2-D","DOIUrl":"https://doi.org/10.1002/1521-396X(200003)178:1<69::AID-PSSA69>3.0.CO;2-D","url":null,"abstract":"Abstract:Förster energy transfer from an excited semiconductor quantum dot to the surrounding organic material is considered. While earlier only the calculations for the lowest excited state of the dot were performed and only the limiting cases of strong and weak confinement were analyzed, in this work we present the results for the crossover region, obtained from the variational calculation. We also consider the transfer from the higher excited states, which may be relevant if the carrier relaxation in the dot is inhibited due to the discreteness of the states. We employ a microscopic quantum mechanical description of the Wannier-Mott exciton in the quantum dot and a macroscopic description of the organic medium. According to our calculations, for II-VI type semiconductors (like CdSe) and strongly absorbing organics (like PTCDA) the energy transfer may occur on time scales of several tens of picoseconds, which is significantly less than the quantum dot excitation lifetime in the absence of such transfer. Thus, as in the case of quantum wells, the Förster mechanism may be an efficient tool for pumping organic light-emitting substances. In this paper we also consider how the carrier intraband relaxation time in the dot may be affected by the Förster energy transfer.","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90333073","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}
引用次数: 32
Impurity scattering in f-wave superconductor UPt3 f波超导体UPt3中的杂质散射
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 1999-12-07 DOI: 10.1016/S0921-4534(00)01421-0
Guolin Yang, K. Maki
{"title":"Impurity scattering in f-wave superconductor UPt3","authors":"Guolin Yang, K. Maki","doi":"10.1016/S0921-4534(00)01421-0","DOIUrl":"https://doi.org/10.1016/S0921-4534(00)01421-0","url":null,"abstract":"","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79939841","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}
引用次数: 4
Weak ferromagnetism in LaMnO3 LaMnO3的弱铁磁性
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 1999-10-01 DOI: 10.1007/S100510050950
V. Skumryev, F. Ott, J. Coey, A. Anane, J. Renard, L. Pinsard-Gaudart, A. Revcolevschi
{"title":"Weak ferromagnetism in LaMnO3","authors":"V. Skumryev, F. Ott, J. Coey, A. Anane, J. Renard, L. Pinsard-Gaudart, A. Revcolevschi","doi":"10.1007/S100510050950","DOIUrl":"https://doi.org/10.1007/S100510050950","url":null,"abstract":"","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88931067","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}
引用次数: 65
Apparent multifractality in financial time series 金融时间序列的表观多重分形
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 1999-06-23 DOI: 10.2139/ssrn.169088
J. Bouchaud, M. Potters, M. Meyer
{"title":"Apparent multifractality in financial time series","authors":"J. Bouchaud, M. Potters, M. Meyer","doi":"10.2139/ssrn.169088","DOIUrl":"https://doi.org/10.2139/ssrn.169088","url":null,"abstract":"Abstract:We present a exactly soluble model for financial time series that mimics the long range volatility correlations known to be present in financial data. Although our model is asymptotically `monofractal' by construction, it shows apparent multiscaling as a result of a slow crossover phenomenon on finite time scales. Our results suggest that it might be hard to distinguish apparent and true multifractal behavior in financial data. Our model also leads to a new family of stable laws for sums of correlated random variables.","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89362362","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}
引用次数: 146
Spin-wave contributions to nuclear magnetic relaxation in magnetic metals 自旋波对磁性金属核磁弛豫的贡献
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 1999-04-27 DOI: 10.1103/PhysRevB.60.14569
V. Irkhin, M. Katsnelson
{"title":"Spin-wave contributions to nuclear magnetic relaxation in magnetic metals","authors":"V. Irkhin, M. Katsnelson","doi":"10.1103/PhysRevB.60.14569","DOIUrl":"https://doi.org/10.1103/PhysRevB.60.14569","url":null,"abstract":"Abstract:The longitudinal and transverse nuclear magnetic relaxation rates 1/T1(T) and 1/T2(T) are calculated for three- and two-dimensional (3D and 2D) metallic ferro- and antiferromagnets (FM and AFM) with localized magnetic moments in the spin-wave temperature region. The contribution of the one-magnon decay processes is strongly enhanced in comparison with the standard T-linear Korringa term, especially for the FM case. For the 3D AFM case this contribution diverges logarithmically, the divergence being cut at the magnon gap ω due to magnetic anisotropy, and for the 2D AFM case as ω-1. The electron-magnon scattering processes yield T2ln(T/ω) and T2/ω1/2-terms in 1/T1 for the 3D AFM and 2D FM cases, respectively. The two-magnon (“Raman”) contributions are investigated and demonstrated to be large in the 2D FM case. Peculiarities of the isotropic 2D limit (where the correlation length is very large) are analyzed.","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82299050","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}
引用次数: 9
Clustering of volatility as a multiscale phenomenon 作为多尺度现象的波动性聚类
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 1999-02-15 DOI: 10.2139/ssrn.162328
M. Pasquini, Maurizio Serva
{"title":"Clustering of volatility as a multiscale phenomenon","authors":"M. Pasquini, Maurizio Serva","doi":"10.2139/ssrn.162328","DOIUrl":"https://doi.org/10.2139/ssrn.162328","url":null,"abstract":"Abstract:The dynamics of prices in financial markets has been studied intensively both experimentally (data analysis) and theoretically (models). Nevertheless, a complete stochastic characterization of volatility is still lacking. What is well known is that absolute returns have memory on a long time range, this phenomenon is known as clustering of volatility. In this paper we show that volatility correlations are power-laws with a non-unique scaling exponent. This kind of multiscale phenomenology has some analogies with fully developed turbulence and disordered systems and it is now pointed out for financial series. Starting from historical returns series, we have also derived the volatility distribution, and the results are in agreement with a log-normal shape. In our study, we consider the New York Stock Exchange (NYSE), daily composite index closes (January 1966 to June 1998) and the US Dollar/Deutsche Mark (USD-DM) noon buying rates certified by the Federal Reserve Bank of New York (October 1989 to September 1998).","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88656620","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}
引用次数: 51
Pattern formation in an inhomogeneous environment 非均匀环境中的模式形成
The European Physical Journal B - Condensed Matter and Complex Systems Pub Date : 1998-10-01 DOI: 10.1007/S100510050500
Walter Zimmermann, Walter Zimmermann, B. Painter, Robert P. Behringer
{"title":"Pattern formation in an inhomogeneous environment","authors":"Walter Zimmermann, Walter Zimmermann, B. Painter, Robert P. Behringer","doi":"10.1007/S100510050500","DOIUrl":"https://doi.org/10.1007/S100510050500","url":null,"abstract":"","PeriodicalId":22452,"journal":{"name":"The European Physical Journal B - Condensed Matter and Complex Systems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86569983","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}
引用次数: 19
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