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1
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Critical and Massive Phases in Spin Chains and Spin Ladders

100%
Sólyom J.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 1
81-90
EN
Spin chains and spin ladders can have a variety of gapless (critical) or gapped (massive) phases depending on the length of the spin and the type of coupling. A brief review of the results on some simple models is given with emphasis on the generation of the Haldane gap in anisotropic spin ladders.
2
Content available remote

Hidden Domain Walls as Elementary Excitations in the Spin-1 Valence-Bond-Solid Model

63%
Fáth G., Sólyom J.
|
EN
Low-energy excitations are studied in the 1D S = 1 antiferromagnetic valence-bond-solid model. The lowest states are found to form a discrete triplet branch, separated from a higher-lying scattering continuum. The elementary excitations are argued to be "hidden" domain walls.
3
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The Role of the Exchange Interaction in the One-Dimensional n-Component Hubbard Model

51%
Szirmai E., Legeza Ö., Sólyom J.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 1
98-100
EN
The commensurate p/q-filled n-component Hubbard chain was investigated by bosonization and high-precision density-matrix renormalization-group analysis. It was found that depending on the relation between the number of components n, and the filling parameter q, the system shows metallic or insulating behavior, and for special fillings bond-ordered (dimerized, trimerized, tetramerized etc.) ground state develops in the insulating phase. A mean-field analysis shows that this bond ordering is a direct consequence of the spin-exchange interaction, which plays a crucial role in the one-parameter Hubbard model - not only for infinite Coulomb repulsion, but for intermediate values as well.
4
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Periodic Anderson Model with d-f Interaction

51%
Hagymási I., Itai K., Sólyom J.
Acta Physica Polonica A
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2012
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vol. 121
|
issue 5-6
1070-1072
EN
We investigate an extended version of the periodic Anderson model where an interaction is switched on between the doubly occupied d- and f-sites. We perform variational calculations using the Gutzwiller trial wave function. We calculate the f-level occupancy as a function of the f-level energy with different interaction strengths. It is shown that the region of valence transition is sharpened due to the new interaction.
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