Browsing Fakülteler by Author "Berker, A. Nihat"
Now showing items 1-8 of 8
-
Across dimensions: Two- and three-dimensional phase transitions from the iterative renormalization-group theory of chains
Keçoğlu, İbrahim; Berker, A. Nihat (2020)Sharp two- and three-dimensional phase transitional magnetization curves are obtained by an iterative renormalization-group coupling of Ising chains, which are solved exactly. The chains by themselves do not have a phase ... -
Complete density calculations of q-state Potts and clock models: Reentrance of interface densities under symmetry breaking
Artun, E. Can; Berker, A. Nihat (Amer Physical Soc, 2020)All local bond-state densities are calculated for q-state Potts and clock models in three spatial dimensions, d = 3. The calculations are done by an exact renormalization group on a hierarchical lattice, including the ... -
Devil's staircase continuum in the chiral clock spin glass with competing ferromagnetic-antiferromagnetic and left-right chiral interactions
Caglar, Tolga; Berker, A. Nihat (Amer Physical Soc., 2017)The chiral clock spin-glass model with q = 5 states with both competing ferromagnetic-antiferromagnetic and left-right chiral frustrations is studied in d = 3 spatial dimensions by renormalization-group theory. The global ... -
Frustrated Potts model: Multiplicity eliminates chaos via reentrance
Türkoğlu, Alpar; Berker, A. Nihat (Amer Physical Soc, 2020)The frustrated q-state Potts model is solved exactly on a hierarchical lattice, yielding chaos under rescaling, namely, the signature of a spin-glass phase, as previously seen for the Ising (q = 2) model. However, the ... -
Lower lower-critical spin-glass dimension from quenched mixed-spatial-dimensional spin glasses
Atalay, Bora; Berker, A. Nihat (Amer Physical Soc., 2018)By quenched-randomly mixing local units of different spatial dimensionalities we have studied Ising spin-glass systems on hierarchical lattices continuously in dimensionalities 1 <= d <= 3. The global phase diagram in ... -
Maximally random discrete-spin systems with symmetric and asymmetric interactions and maximally degenerate ordering
Atalay, Bora; Berker, A. Nihat (Amer Physical Soc., 2018)Discrete-spin systems with maximally random nearest-neighbor interactions that can be symmetric or asymmetric ferromagnetic or antiferromagnetic including off-diagonal disorder are studied for the number of states q = 34 ... -
Metastable reverse-phase droplets within ordered phases: Renormalization-group calculation of field and temperature dependence of limiting size
Eren, Ege; Berker, A. Nihat (AMER PHYSICAL SOC, 2020)Metastable reverse-phase droplets are calculated by renormalization-group theory by evaluating the magnetization of a droplet under magnetic field, matching the boundary condition with the reverse phase and noting whether ... -
Phase transitions between different spin-glass phases and between different chaoses in quenched random chiral systems
Çağlar, Tolga; Berker, A. Nihat (Amer Physical Soc., 2017)The left-right chiral and ferromagnetic-antiferromagnetic double-spin-glass clock model with the crucially even number of states q = 4 and in three dimensions d = 3 has been studied by renormalization-group theory. We find ...