Exactly solvable spin ladder model with degenerate ferromagnetic and singlet states
| Autor: | D.V. Dmitriev, V.Ya. Krivnov, A.A. Ovchinnikov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Spins Degenerate energy levels FOS: Physical sciences Condensed Matter Physics Electronic Optical and Magnetic Materials symbols.namesake Condensed Matter - Strongly Correlated Electrons Excited state Quantum mechanics Thermodynamic limit symbols Condensed Matter::Strongly Correlated Electrons Singlet state Exponential decay Wave function Hamiltonian (quantum mechanics) |
| Popis: | We study the spin ladder model with interactions between spins on neighboring rungs. The model Hamiltonian with the exact singlet ground state degenerated with ferromagnetic state is obtained. The singlet ground state wave function has a special recurrent form and depends on two parameters. Spin correlations in the singlet ground state show double-spiral structure with period of spirals equals to the system size. For special values of parameters they have exponential decay. The spectrum of the model is gapless and there are asymptotically degenerated excited states for special values of parameters in the thermodynamic limit. 10 pages, 6 figures, revtex. accepted to The European Physical Journal B |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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