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Luttinger Liquid as a New Metallic State of Correlated Fermions

100%
Byczuk K., Spałek J.
Acta Physica Polonica A
|
1996
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vol. 90
|
issue 4
595-602
EN
This article provides an elementary introduction to the physics of the Luttinger liquid and summarizes its basic properties, as well as discusses examples, where such quantum liquid would be or has been observed experimentally. A comparison with the Fermi-liquid state is made
2
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Application of Statistical Spin Liquid Concept to High-Temperature Superconductivity

100%
Byczuk K., Spałek J.
Acta Physica Polonica A
|
1994
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vol. 85
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issue 2
337-340
EN
We apply the concept of statistical spin liquid, in which the doubly occupied quasimomentum configurations {|k⇅⟩} for quasiparticles are excluded from the Fock space, to a planar superconductor with real space pairing. The results compare very well with experimental data for the cuprates, namely (i) the condensed state appears only for the number of holes 0 < δ < 0.15-0.25; (ii) the temperature dependence of the gap is close to the BCS result, but the gap has systematically lower value and is of an extended s-wave form.
3
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Surprises in Correlated Electron Physics

81%
Byczuk K., Hofstetter W., Kollar M., Vollhardt D.
Acta Physica Polonica A
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2007
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vol. 111
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issue 4
549-561
EN
Strong electronic correlations and especially the interplay between correlations and disorder lead to many interesting and quite unexpected phenomena. A short summary of our recent investigations into the properties of strongly correlated electron systems with and without disorder using the dynamical mean-field theory is presented.
4
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Ferromagnetism and Metal-Insulator Transitions in Correlated Electron Systems with Alloy Disorder

81%
Byczuk K., Yu U., Hofstetter W., Vollhardt D.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
7-12
EN
Alloy disorder can affect ferromagnetism and metal-insulator transitions of correlated lattice fermion systems in subtle and often unexpected ways. Solving the Hubbard model and the periodic Anderson model within dynamical mean-field theory we show that alloy disorder can increase the Curie temperature of a non-disordered system, and also yields novel Mott or Kondo insulators at fractional electronic densities.
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