Výsledky vyhledávání - "Berker, A. N."

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Fractal Measures of Sea, Lake, Strait, and Dam-Reserve Shores: Calculation, Differentiation, and Interpretation

Autor: Yilmazer, D., Berker, A. N., Yilmaz, Y.

The fractal dimensions d_f of the shore lines of the Mediterranean, the Aegean, the Black Sea, the Bosphorus Straits (on both the Asian and European sides), the Van Lake, and the lake formed by the Ataturk Dam have been calculated. Important distinct

Externí odkaz: http://arxiv.org/abs/2009.06916

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Finite-temperature phase diagram of nonmagnetic impurities in high-temperature superconductors using a d=3 tJ model with quenched disorder

Autor: Hinczewski, M., Berker, A. N.

Publikováno v: Phys. Rev. B 78, 064507 (2008)

We study a quenched disordered d=3 tJ Hamiltonian with static vacancies as a model of nonmagnetic impurities in high-Tc materials. Using a position-space renormalization-group approach, we calculate the evolution of the finite-temperature phase diagr

Externí odkaz: http://arxiv.org/abs/cond-mat/0607171

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Phase Diagrams and Crossover in Spatially Anisotropic d=3 Ising, XY Magnetic and Percolation Systems: Exact Renormalization-Group Solutions of Hierarchical Models

Autor: Erbas, A., Tuncer, A., Yucesoy, B., Berker, A. N.

Publikováno v: Phys. Rev. E 72, 026129 (2005)

Hierarchical lattices that constitute spatially anisotropic systems are introduced. These lattices provide exact solutions for hierarchical models and, simultaneously, approximate solutions for uniaxially or fully anisotropic d=3 physical models. The

Externí odkaz: http://arxiv.org/abs/cond-mat/0506716

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Strongly Asymmetric Tricriticality of Quenched Random-Field Systems

Autor: Kabakcioglu, A., Berker, A. N.

Publikováno v: Phys. Rev. Lett. 82, 2572 (1999)

In view of the recently seen dramatic effect of quenched random bonds on tricritical systems, we have conducted a renormalization-group study on the effect of quenched random fields on the tricritical phase diagram of the spin-1 Ising model in $d=3$.

Externí odkaz: http://arxiv.org/abs/cond-mat/9811235

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Finite-Temperature Phase Diagram of the Hubbard Model

Autor: Migliorini, G., Berker, A. N.

The finite-temperature phase diagram of the Hubbard model in $d=3$ is obtained from renormalization-group analysis. It exhibits, around half filling, an antiferromagnetic phase and, between 30%--40% electron or hole doping from half filling, a new $\

Externí odkaz: http://arxiv.org/abs/cond-mat/9811233

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