Výsledky vyhledávání - "V. V. Hovhannisyan"

Computation of Microcanonical Entropy at Fixed Magnetization Without Direct Counting

Autor: Giacomo Gori, Alessandro Campa, Stefano Ruffo, Andrea Trombettoni, V. V. Hovhannisyan

Publikováno v: Journal of statistical physics (Dordr., Online) 184 (2021): 18421-1–18421-36. doi:10.1007/s10955-021-02809-y
info:cnr-pdr/source/autori:Campa A.; Gori G.; Hovhannisyan V.; Ruffo S.; Trombettoni A./titolo:Computation of Microcanonical Entropy at Fixed Magnetization Without Direct Counting/doi:10.1007%2Fs10955-021-02809-y/rivista:Journal of statistical physics (Dordr., Online)/anno:2021/pagina_da:18421-1/pagina_a:18421-36/intervallo_pagine:18421-1–18421-36/volume:184

We discuss a method to compute the microcanonical entropy at fixed magnetization without direct counting. Our approach is based on the evaluation of a saddle-point leading to an optimization problem. The method is applied to a benchmark Ising model w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46bcda92f00483b16e84c5dbff5bef3f
https://doi.org/10.1007/s10955-021-02809-y

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Partition function zeros and magnetization plateaus of the spin-1 Ising–Heisenberg diamond chain

Autor: V. V. Hovhannisyan, Nerses Ananikian, Ralph Kenna

Publikováno v: Physica A: Statistical Mechanics and its Applications. 453:116-130

We study the properties of the generalized spin-1 Ising–Heisenberg model on a diamond chain, which can be considered as a theoretical model for the homometallic magnetic complex [ Ni 3 ( C 4 H 2 O 4 ) 2 − ( μ 3 − OH ) 2 ( H 2 O ) 4 ] n ⋅ ( 2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::11ff23909d2f65b5cae259c2a37468d7
https://doi.org/10.1016/j.physa.2016.02.047

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Quantum transitions, magnetization and thermal entanglement of the spin-1 Ising–Heisenberg diamond chain

Autor: L. N. Ananikyan, V.S. Abgaryan, Nerses Ananikian, V. V. Hovhannisyan

Publikováno v: Solid State Communications. 224:15-20

We consider the quasi-one dimensional spin-1 Ising–Heisenberg model with single-ion anisotropy on a diamond chain. Due to the exact solution of the model, we constructed the ground state phases which, alongside to others, have shown capability to e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::70216d339b7eaf901061dbeb14d628ee
https://doi.org/10.1016/j.ssc.2015.10.003

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Complete analysis of ensemble inequivalence in the Blume-Emery-Griffiths model

Autor: Alessandro Campa, V. V. Hovhannisyan, Nerses Ananikian, Stefano Ruffo

Publikováno v: Physical review. E, Statistical, nonlinear and soft matter physics (Online) 96 (2017): 062103-1–062103-19. doi:10.1103/PhysRevE.96.062103
info:cnr-pdr/source/autori:Hovhannisyan V.V.; Ananikian N.S.; Campa A.; Ruffo S./titolo:Complete analysis of ensemble inequivalence in the Blume-Emery-Griffiths model/doi:10.1103%2FPhysRevE.96.062103/rivista:Physical review. E, Statistical, nonlinear and soft matter physics (Online)/anno:2017/pagina_da:062103-1/pagina_a:062103-19/intervallo_pagine:062103-1–062103-19/volume:96

We study inequivalence of canonical and microcanonical ensembles in the mean-field Blume-Emery-Griffiths model. This generalizes previous results obtained for the Blume-Capel model. The phase diagram strongly depends on the value of the biquadratic e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff706db163a31afa467291a0757e8022
https://pubmed.ncbi.nlm.nih.gov/29347411

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Partition function zeros of the antiferromagnetic spin- Ising–Heisenberg model on a diamond chain

Autor: V. V. Hovhannisyan, Nerses Ananikian, Ralph Kenna

Publikováno v: Physica A: Statistical Mechanics and its Applications. 396:51-60

The partition function zeros of the antiferromagnetic spin- 1 2 Ising–Heisenberg model on a diamond chain are studied using the transfer matrix method. Analytical equations for the distributions of Yang–Lee and Fisher zeros are derived. The Yang�

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9248a0f7c28f8a28a6b409bde42dff0d
https://doi.org/10.1016/j.physa.2013.11.017

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Magnetic properties, Lyapunov exponent and superstability of the spin- Ising–Heisenberg model on a diamond chain

Autor: V. V. Hovhannisyan, Nerses Ananikian

Publikováno v: Physica A: Statistical Mechanics and its Applications. 392:2375-2383

The exactly solvable spin- 1 2 Ising–Heisenberg model on a diamond chain has been considered. We have found the exact results for the magnetization using the recursion relation method. The existence of the magnetization plateau has been observed at

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2ab77f75a27be376f8c86482d45b8195
https://doi.org/10.1016/j.physa.2013.01.040

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KAGOME APPROXIMATION FOR 3He ON HUSIMI LATTICE WITH TWO- AND THREE-SITE EXCHANGE INTERACTIONS

Autor: V. V. Hovhannisyan, H. A. Lazaryan, Nerses Ananikian

Publikováno v: International Journal of Modern Physics B. 24:5913-5927

The Ising approximation of the Heisenberg model in a strong magnetic field, with two-, and three-spin exchange interactions are studied on a Husimi lattice. This model can be considered as an approximation of the third layer of 3 He absorbed on the s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::782bc0f7e37a90978e77401df5ec0499
https://doi.org/10.1142/s0217979210054324

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The partition function zeros of the anisotropic Ising model with multisite interactions on a zigzag ladder

Autor: Nerses Ananikian, R.G. Ghulghazaryan, V. V. Hovhannisyan

Publikováno v: Physica A: Statistical Mechanics and its Applications. 388:1479-1490

It is shown that the spin- 1 2 anisotropic Ising model with multisite interactions on a zigzag ladder may be mapped into the one dimensional spin- 1 2 Axial-Next-Nearest-Neighbor Ising (ANNNI) model with multisite interactions. The partition function

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e8ed6c36db2b5540420624e72fa778ff
https://doi.org/10.1016/j.physa.2008.12.065

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Antiferromagnetic model and magnetization plateaus on the zigzag ladder with two- and three-site exchanges

Autor: V. V. Hovhannisyan, Nerses Ananikian

Publikováno v: Physics Letters A. 372:3363-3368

The Ising approximation is proposed for the Heisenberg model with two- and three-spin exchange interactions on a zigzag ladder placed in a strong magnetic field. Using the transfer matrix technique the magnetization is calculated and compared with th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::54975d451deedd28586252e2c7c2703b
https://doi.org/10.1016/j.physleta.2008.02.004

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MAGNETIZATION PLATEAUS ON THE ZIGZAG LADDER WITH TWO-, AND THREE-SITE EXCHANGES

Autor: L. N. Ananikyan, Nerses Ananikian, V. V. Hovhannisyan

Publikováno v: International Journal of Modern Physics B. 21:3567-3579

We consider the Heisenberg model with two-, and three-spin exchange interactions on a zigzag ladder in a strong magnetic field. Using the recursion method for the partition function in Ising approximation we have found exact results for the magnetiza

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::98d6530a32789e14c8e5b8ce34170e2c
https://doi.org/10.1142/s0217979207037569

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