Absence of dimensional crossover at the zero-temperature transition in a Bose system

1980 ◽  
Vol 22 (11) ◽  
pp. 5267-5273 ◽  
Author(s):  
Marco Zannetti
Keyword(s):  
Bose System ◽  
Dimensional Crossover ◽  
Zero Temperature ◽  
Temperature Transition

scholarly journals Holographic quarkyonic matter

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Nicolas Kovensky ◽  
Andreas Schmitt
Keyword(s):  
Nuclear Matter ◽  
Real World ◽  
Quark Matter ◽  
Chiral Limit ◽  
Pion Mass ◽  
Zero Temperature ◽  
Temperature Transition ◽  
Physical Point ◽  
First Order ◽  
Chemical Potentials

Abstract We point out a new configuration in the Witten-Sakai-Sugimoto model, allowing baryons in the pointlike approximation to coexist with fundamental quarks. The resulting phase is a holographic realization of quarkyonic matter, which is predicted to occur in QCD at a large number of colors, and possibly plays a role in real-world QCD as well. We find that holographic quarkyonic matter is chirally symmetric and that, for large baryon chemical potentials, it is energetically preferred over pure nuclear matter and over pure quark matter. The zero-temperature transition from nuclear matter to the quarkyonic phase is of first order in the chiral limit and for a realistic pion mass. For pion masses far beyond the physical point we observe a quark-hadron continuity due to the presence of quarkyonic matter.

DIMENSIONAL CROSSOVER IN Bi1.8Pb0.4Sr2Ca2Cu3Oy TEXTURED THICK FILM

1996 ◽  
Vol 10 (21) ◽  
pp. 1027-1033 ◽  
Author(s):  
Z.H. WANG
Keyword(s):  
Magnetic Field ◽  
Critical Temperature ◽  
Thick Film ◽  
Zero Magnetic Field ◽  
Dimensional Crossover ◽  
Zero Temperature ◽  
Classic Theory ◽  
Zero Resistance ◽  
Textured Thick Film ◽  
2D To 3D

The temperature dependence of resistance of C -axis oriented Bi (2223) thick film from 300 K to 100 K at 0 T (zero magnetic field) were measured. By choosing T c in different ways, such as R/Rn=0.9, 0.5, 0.1, 0.01 and 0.001, they are shown that the different results could be obtained. The data were described in terms of the classic theory of thermodynamic fluctuations. Two crossover from 2D to 3D and 1D to 2D was observed very close to the critical temperature T c when T c only was defined as zero-resistance temperature. The zero-temperature coherence length was estimated.

SPIN TEXTURES AND RANDOM FIELDS IN DIRTY QUANTUM HALL FERROMAGNETS

2006 ◽  
Vol 20 (19) ◽  
pp. 2785-2794
Author(s):  
J. T. CHALKER
Keyword(s):  
Ground State ◽  
Random Fields ◽  
Order Parameter ◽  
Magnetic Order ◽  
Quantum Hall ◽  
Quenched Disorder ◽  
Zero Temperature ◽  
Temperature Transition ◽  
Strong Disorder ◽  
Second Category

Dirty quantum Hall ferromagnets (QHFMs) provide a setting both for new problems in the theory of magnetism with quenched disorder, and for new realisations of old problems. In the first category, the fact that spin textures in Heisenberg QHFMs carry charge leads to a coupling between charged impurities and magnetic order. This coupling drives a zero-temperature transition between a ferromagnet at low disorder and a spin glass at strong disorder, and controls screening and the nature of excitations in the disorder-dominated ground state. In the second category, random fields coupling linearly to the order parameter appear in some Ising QHFMs, and transport measurements appear to indicate field-induced domain states at low temperature.

scholarly journals Impurity self-energy in the strongly-correlated Bose systems

2018 ◽  
Vol 32 (05) ◽  
pp. 1850053 ◽  
Author(s):  
Galyna Panochko ◽  
Volodymyr Pastukhov ◽  
Ivan Vakarchuk
Keyword(s):  
Density Fluctuations ◽  
Bose System ◽  
Strongly Correlated ◽  
Zero Temperature ◽  
Path Integral Formulation ◽  
Self Energy ◽  
Helium 4 ◽  
Good Consistency ◽  
Impurity Spectrum ◽  
Density Ideal

We proposed the nonperturbative scheme for the calculation of the impurity spectrum in the Bose system at zero temperature. The method is based on the path-integral formulation and describes an impurity as a zero-density ideal Fermi gas interacting with Bose system for which the action is written in terms of density fluctuations. On the example of the 3He atom immersed in the liquid helium-4 a good consistency with experimental data and results of Monte Carlo simulations is shown.

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