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Condensed Matter > Strongly Correlated Electrons
Title: Quantum phases of a frustrated spin-1 system: The 5/7 skewed ladder
(Submitted on 14 Dec 2020 (v1), last revised 11 Oct 2021 (this version, v3))
Abstract: The quantum phases in a spin-1 skewed ladder system formed by alternately fusing five- and seven-membered rings are studied numerically using the exact diagonalization technique up to 16 spins and using the density matrix renormalization group method for larger system sizes. The ladder has a fixed isotropic antiferromagnetic (AF) exchange interaction ($J_2 = 1$) between the nearest-neighbor spins along the legs and a varying isotropic AF exchange interaction ($J_1$) along the rungs. As a function of $J_1$, the system shows many interesting ground states (gs) which vary from different types of nonmagnetic and ferrimagnetic gs. The study of diverse gs properties such as spin gap, spin-spin correlations, spin density and bond order reveal that the system has four distinct phases, namely, the AF phase at small $J_1$; the ferrimagnetic phase with gs spin $S_G = n$ for $1.44 < J_1 < 4.74$ and with $S_G = 2n$ for $J_1 > 5.63$, where $n$ is the number of unit cells; and a reentrant nonmagnetic phase at $4.74 < J_1 < 5.44$. The system also shows the presence of spin current at specific $J_1$ values due to simultaneous breaking of both reflection and spin parity symmetries.
Submission history
From: Dayasindhu Dey [view email][v1] Mon, 14 Dec 2020 13:05:08 GMT (351kb,D)
[v2] Fri, 28 May 2021 12:05:35 GMT (418kb,D)
[v3] Mon, 11 Oct 2021 08:34:55 GMT (411kb,D)
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