Zobrazeno 1 - 10 of 91 pro vyhledávání: '"R. Riklund"'
2
Correlated Random Tight-Binding System with One Periodic State: Its Time Evolution and the Effects of an Added Nonlinearity
Autor: R. Riklund, B. Lindquist
Publikováno v: physica status solidi (b). 209:353-362
We study a one-dimensional tight-binding system with constant on-site potential and off-diagonal hopping integrals t binary valued, and distributed as correlated random dimers. An explicit transformation from the system with constant t reveals that n
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::24ee68a78184d3ae0f2d05a53981a7cd
https://doi.org/10.1002/(sici)1521-3951(199810)209:2<353::aid-pssb353>3.0.co
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6
Concentration-Fluctuation Model of a Doped Semiconductor in the Nonmetallic Regime. III. Coulomb Gap
Autor: Jia-Lin Zhu, R Riklund, K.A. Chao
Publikováno v: Physica Scripta. 35:490-498
Using the unrestricted Hartree-Fock scheme in the framework of pseudocluster calculation developed by us earlier, the Coulomb gap is investigated for compensated doped semiconductors in deep nonmetallic regime. For given degree of compensation, we ob
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cc263dba9708b5d56506431706283e5c
https://doi.org/10.1088/0031-8949/35/4/014
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7
Extended spin waves in a one-dimensional ferromagnetic aperiodic crystal
Autor: R Riklund, M Severin
Publikováno v: Journal of Physics C: Solid State Physics. 21:L965-L970
Since the character of the low-lying spin excitations in a one-dimensional disordered system is still to some extent under debate, and the quasi-crystals can, in some sense, be said to fill the space between the disordered and periodic systems, the a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::33a74c3760e5a92d9d6c9733df9da0e1
https://doi.org/10.1088/0022-3719/21/26/007
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8
Extension of the hopping range in incommensurate systems can generate localised states
Autor: G Wahlstrom, R Riklund, Zheng Zhao-bo, Y Liu
Publikováno v: Journal of Physics C: Solid State Physics. 19:L705-L709
The effect of hopping beyond nearest neighbours on the electronic properties of incommensurate systems is discussed very little in the literature even though for example structural phase transitions from commensurate to incommensurate systems are imp
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::56db6fbbba49ea36a219c70f10bf3e30
https://doi.org/10.1088/0022-3719/19/30/004
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9
Modified mott-hubbard-anderson model results of an unrestricted hartree-fock pseudocluster calculation
Autor: R. Riklund, K. A. Chao, A. Ferreira da Silva
Publikováno v: Philosophical Magazine B. 42:755-761
We have performed a pseudocluster calculation to show that while the MHA model for doped semiconductors is valid for very low impurity concentrations (N ≲ N c/2, N c = critical concentration), the donor-excitonic states are important in the regime
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0206682f7f10b33b4386422c970f809a
https://doi.org/10.1080/01418638008222325
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10
Interacting stereo-irregular chains: A model for conducting polymers
Autor: Sven Stafström, K. A. Chao, R. Riklund
Publikováno v: International Journal of Quantum Chemistry. 23:1363-1383
Interacting stereo-irregular chains of hydrogen atoms, which simulate the topological structure of many conducting polymers, are generated by a computer and solved numerically with the unrestricted Hartree–Fock method with a modified spin polarized
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::565e513f9bed654768b66144e44fb448
https://doi.org/10.1002/qua.560230422
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