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Landau theory
About: Landau theory is a research topic. Over the lifetime, 2882 publications have been published within this topic receiving 57078 citations.
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TL;DR: A recent theory of a compressible Fermi-liquid-like state at Landau level filling factors nu =1/q or 1-1/ q, q even, is reviewed, with emphasis on the basic physical concepts.
Abstract: A recent theory of a compressible Fermi-liquid-like state at Landau level filling factors nu =1/q or 1-1/q, q even, is reviewed, with emphasis on the basic physical concepts.
169 citations
TL;DR: In this paper, a Landau theory is presented and discussed in terms of the results of a two-dimensional colloidal liquid of strongly interacting spherical particles to produce an external periodic potential and stimulate a density modulation.
Abstract: Laser beams are crossed in a two-dimensional colloidal liquid of strongly interacting spherical particles to produce an external periodic potential and stimulate a density modulation. If the modulation wave vector is at the peak in the static structure factor, a sufficiently large potential induces a phase transition to a structure which exhibits solidlike order having density modes other than those directly excited. A Landau theory is presented and discussed in terms of our results.
169 citations
TL;DR: In this article, the global phase diagram is discussed within the framework of Landau theory and several types of phase transitions are found, where critical surface phenomena occur since a variety of surface exponents may be defined although there are no bulk exponents.
Abstract: Semi-infinite systems are considered which undergo a first-order transition. The global phase diagram is discussed within the framework of Landau theory. Several types of phase transitions are found. At some of these transitions, critical surface phenomena occur since a variety of surface exponents may be defined although there are no bulk exponents.
165 citations
TL;DR: In this paper, a general free energy functional for a superconductor is given and different cases where it can be reduced to a Ginzburg-Landau form or to a simple generalization of this form is studied.
Abstract: In this review the author describes how the simple Ginzburg-Landau approach lies in the heart of the general theory of superconductors. The reader is introduced to the handling of the theory and to the numerous possibilities of applications. A general free energy functional for a superconductor is given and the different cases where it can be reduced to a Ginzburg-Landau form or to a simple generalization of this form is studied. It is emphasized that applications are not restricted to thermo-dynamical ones as the Ginzburg-Landau approach can be used in the calculation of dissipative phenomena. The possibility of an extension to the time-dependent phenomena is discussed in detail to present the difficult problems which arise in that case. The gapless regime of type II superconductors is given as an example.
165 citations
TL;DR: In this paper, a simple model based on Landau theory is developed as a guide for the straightforward production of samples with ferroelectric properties designed for particular applications, and the polarization of PbTiO3/SrTiO 3 superlattices is experimentally tuned from 0-60 mu C/cm(-2) and the transition temperature from room temperature to 1000 K while maintaining a perfect crystal structure and low leakage currents.
Abstract: The polarization of PbTiO3/SrTiO3 superlattices is experimentally tuned from 0-60 mu C/cm(-2) and the transition temperature from room temperature to 1000 K while maintaining a perfect crystal structure and low leakage currents (see figure). A simple model based on Landau theory is developed as a guide for the straightforward production of samples with ferroelectric properties designed for particular applications.
164 citations