Details

Autor(en) / Beteiligte

• Das, Sambunath
• Dey, Dayasindhu
• Ramasesha, S.
• Kumar, Manoranjan

Titel

Quantum phases of spin-1 system on 3/4 and 3/5 skewed ladders

Ist Teil von

• Journal of applied physics, 2021-06, Vol.129 (22)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2021

Quelle

American Institute of Physics (AIP) Journals

Beschreibungen/Notizen

• We study the quantum phase transitions of frustrated antiferromagnetic Heisenberg spin-1 systems on the 3/4 and 3/5 skewed two leg ladder geometries. These systems can be viewed as arising by periodically removing rung bonds from a zigzag ladder. We find that in large systems, the ground state (gs) of the 3/4 ladder switches from a singlet to a magnetic state for J 1 ≥ 1.82; the gs spin corresponds to the ferromagnetic alignment of effective S = 2 objects on each unit cell. The gs of antiferromagnetic exchange Heisenberg spin-1 system on a 3/5 skewed ladder is highly frustrated and has spiral spin arrangements. The amplitude of the spin density wave in the 3/5 ladder is significantly larger compared to that in the magnetic state of the 3/4 ladder. The gs of the system switches between singlet state and low spin magnetic states multiple times on tuning J 1 in a finite size system. The switching pattern is nonmonotonic as a function of J 1 and depends on the system size. It appears to be the consequence of a higher J 1 favoring a higher spin magnetic state and the finite system favoring a standing spin wave. For some specific parameter values, the magnetic gs in the 3/5 system is doubly degenerate in two different mirror symmetry subspaces. This degeneracy leads to spontaneous spin-parity and mirror symmetry breaking, giving rise to spin current in the gs of the system.