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pro vyhledávání: '"SOÓS, Zoltán"'
The frustrated ladder with alternate ferromagnetic(F) exchange $-J_F$ and AF exchange $J_A$ to first neighbors and F exchange $-J_L$ to second neighbors is studied by exact diagonalization (ED) and density matrix renormalization group (DMRG) calculat
Externí odkaz:
http://arxiv.org/abs/2403.05238
Autor:
Das, Sambunath, Dey, Dayasindhu, Raghunathan, Rajamani, Soos, Zoltán G., Kumar, Manoranjan, Ramasesha, S.
In this brief review, we introduce a new spin ladder system called skewed spin ladders and discuss the exotic quantum phases of this system. The spin ladders studied are the 5/7, 3/4 and 3/5 systems corresponding to alternately fused 5 and 7 membered
Externí odkaz:
http://arxiv.org/abs/2311.05000
The magnetization $M(h)$ is used to identify three singlet quantum phases of the ladder with isotropic exchange interactions. The Dimer phase with frustrated F exchanges in rungs and legs has a first-order $M(h)$ transition at $0$ K from singlet to f
Externí odkaz:
http://arxiv.org/abs/2305.12884
Publikováno v:
Physical Review B 105, 235109 (2022)
The spin$-1/2$ chain with ferromagnetic exchange $J_1 < 0$ between first neighbors and antiferromagnetic $J_2 > 0$ between second neighbors supports two spin-Peierls (SP) instabilities depending on the frustration $\alpha = J_2/\vert J_1\vert$. Inste
Externí odkaz:
http://arxiv.org/abs/2206.10840
Publikováno v:
Phys. Rev. B 103, 245139 (2021)
The antiferromagnetic $J_1-J_2$ model is a spin-1/2 chain with isotropic exchange $J_1 > 0$ between first neighbors and $J_2 = \alpha J_1$ between second neighbors. The model supports both gapless quantum phases with nondegenerate ground states and g
Externí odkaz:
http://arxiv.org/abs/2106.14775
Publikováno v:
Journal of Magnetism and Magnetic Materials 552, 169150 (2022)
The low temperature thermodynamics of correlated 1D fermionic models with spin and charge degrees of freedom is obtained by exact diagonalization (ED) of small systems and followed by density matrix renormalization group (DMRG) calculations that targ
Externí odkaz:
http://arxiv.org/abs/2101.04362
The spin-$1/2$ chain with antiferromagnetic exchange $J_1$ and $J_2 = \alpha J_1$ between first and second neighbors, respectively, has both gapless and gapped ($\Delta(\alpha) > 0$) quantum phases at frustration $0 \le \alpha \le 3/4$. The ground st
Externí odkaz:
http://arxiv.org/abs/2010.02999
The spin-Peierls transition at $T_{SP}$ of spin-$1/2$ chains with isotropic exchange interactions has previously been modeled as correlated for $T > T_{SP}$ and mean field for $T < T_{SP}$. We use correlated states throughout in the $J_1-J_2$ model w
Externí odkaz:
http://arxiv.org/abs/2001.05384
The spin-Peierls transition is modeled in the dimer phase of the spin-$1/2$ chain with exchanges $J_1$, $J_2 = \alpha J_1$ between first and second neighbors. The degenerate ground state generates an energy cusp that qualitatively changes the dimeriz
Externí odkaz:
http://arxiv.org/abs/1907.03724
Exact diagonalization (ED) of small model systems gives the thermodynamics of spin chains or quantum cell models at high temperature $T$. Density matrix renormalization group (DMRG) calculations of progressively larger systems are used to obtain exci
Externí odkaz:
http://arxiv.org/abs/1905.05956