排序方式: 共有27条查询结果,搜索用时 15 毫秒
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L.?M.?Abreu A.?P.?C.?Malbouisson I.?RoditiEmail author 《The European Physical Journal B - Condensed Matter and Complex Systems》2004,37(4):515-522
In this paper we consider a type-I superconducting film modeled by the Ginzburg-Landau model, confined between two parallel planes a distance L apart from one another. Our approach is based on the Gaussian effective potential in the transverse unitarity gauge, which allows to treat gauge contributions in a compact form. Using techniques from dimensional and
-function regularizations, modified by the confinement conditions, we investigate the critical temperature as a function of the film thickness L. The contributions from the scalar self-interaction and from the gauge fluctuations are clearly identified. The model suggests the existence of a minimal critical thickness below which superconductivity is suppressed. A comparison with present experimental observations is done.Received: 19 December 2003, Published online: 9 April 2004PACS:
74.20.-z Theories and models of superconducting state - 11.15.Ex Spontaneous breaking of gauge symmetries - 05.10.Cc Renormalization group methods 相似文献
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By the concurrent use of dimensional and analytic regularizations with the complete Mellin (CM) representation, we find in a direct way the ultraviolet and infrared poles in space-time dimension, for any Feynman amplitude with an arbitrary subset of vanishing masses. 相似文献
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E. B. S. Corrêa C. A. Linhares A. P. C. Malbouisson J. M. C. Malbouisson A. E. Santana 《The European Physical Journal C - Particles and Fields》2017,77(4):261
We study effects coming from finite size, chemical potential and from a magnetic background on a massive version of a four-fermion interacting model. This is performed in four dimensions as an application of recent developments for dealing with field theories defined on toroidal spaces. We study effects of the magnetic field and chemical potential on the size-dependent phase structure of the model, in particular, how the applied magnetic field affects the size-dependent critical temperature. A connection with some aspects of the hadronic phase transition is established. 相似文献
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E. Cavalcanti E. Castro C. A. Linhares A. P. C. Malbouisson 《The European Physical Journal C - Particles and Fields》2017,77(10):711
A scalar model is built, as a quantum field theory defined on a toroidal topology, to describe a phase transition in films subjected to periodic boundary conditions and influenced by an external and constant magnetic field. Criticality is studied and the relations between the critical temperature, the film thickness, the magnetic field strength and the chemical potential are investigated. Since the model describes a second-order phase transition a comparison with the Ginzburg–Landau theory is made. 相似文献
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C. O. Escobar A. P. C. Malbouisson A. F. S. Santoro R. C. Shellard M. H. G. Souza 《Fortschritte der Physik》1981,29(10):463-486
Several mechanisms for the production of heavy QQ bound states are reviewed. A systematic comparison between model predictions and experimental results is presented. The various theoretical and experimental uncertainties are discussed. 相似文献
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