scholarly journals Quantum fluctuation generated vortices, dual singular-gauge transformation, and zero-temperature transition fromd-wave superconductor to underdoped regime

2002 ◽  
Vol 65 (21) ◽  
Author(s):  
Jinwu Ye
Keyword(s):  
Gauge Transformation ◽  
Quantum Fluctuation ◽  
Zero Temperature ◽  
Temperature Transition ◽  
Underdoped Regime

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.

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 Interplay of curvature and rigidity in shape-based models of confluent tissue

2020 ◽  
Author(s):  
Daniel M. Sussman
Keyword(s):  
Cell Motility ◽  
Biological Tissue ◽  
Finite Temperature ◽  
Transition Point ◽  
Shape Index ◽  
Two Dimensional ◽  
Zero Temperature ◽  
Temperature Transition ◽  
Vertex Models ◽  
Geodesic Distances

Rigidity transitions in simple models of confluent cells have been a powerful organizing principle in understanding the dynamics and mechanics of dense biological tissue. In this work we explore the interplay between geometry and rigidity in two-dimensional vertex models confined to the surface of a sphere. By considering shapes of cells defined by perimeters whose magnitude depends on geodesic distances and areas determined by spherical polygons, the critical shape index in such models is affected by the size of the cell relative to the radius of the sphere on which it is embedded. This implies that cells can collectively rigidify by growing the size of the sphere, i.e. by tuning the curvature of their domain. Finite-temperature studies indicate that cell motility is affected well away from the zero-temperature transition point.

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