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The Energy Spectrum and Thermodynamics of Spin-1/2 XX Chain with Ising Impurities

100%
Ezerskaya E.
Acta Physica Polonica A
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2017
|
vol. 131
|
issue 4
928-930
EN
The energy spectrum and peculiarities of field and temperature dependences of the basic thermodynamic characteristics of the finite spin-1/2 XX chain closed by one zz (Ising) bond and open ends XX-chain with two zz-impurities at the both ends have been investigated.
2
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On the Energy Spectrum and Ground-State Properties οf the Decorated Heisenberg Spin Tube

63%
Cheranovskii V., Ezerskaya E.
|
|
issue 5
946-947
EN
The ground-state properties of decorated Heisenberg spin tubes with nearest- and next-nearest-neighbor antiferromagnetic exchange interactions has been studied using perturbation theory and exact diagonalization technique. The possibility of quantum phase transitions mediated by next-nearest neighbor interactions for these tubes is shown.
3
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Ground-State Spin of Hubbard Ladder Model with Infinite Electron Repulsion

51%
Cheranovskii V., Ezerskaya E., Klein D., Tokarev V.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 4
916-918
EN
We apply perturbation theory and cyclic spin permutation formalism to study the lowest energy states of the infinite-repulsion Hubbard model on n-leg ladders with alternating values of one-site energies α_{i} for neighboring rungs. We establish the "ferromagnetic" character of ladder ground-state at electron densities in the interval 1 - (2n)¯¹ ≤ ρ ≤ 1 and sufficiently large alternation of one-site energies of neighbor rungs of the ladder. We also show the stability of this state against the small deviations of the values of α_{i} in contrast to the case of two-leg ladder formed by weakly interacting neighbor rungs with equal one-site energies.
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