Quantum spin pumping at fractionally quantized magnetization state for a system with competing exchange interactions

Details Quantum spin pumping at fractionally quantized magnetization state for a system with competing exchange interactions Quantum spin pumping at fractionally quantized magnetization state for a system with competing exchange interactions

2008-03-20

arxiv.org/abs/0803.2951v1

Phys. Rev. B 77, 064413 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.77.064413

We study the quantum spin pumping of an antiferromagnetic spin-1/2 chain with competing exchange interactions. We show that spatially periodic potential modulated in space and time acts as a quantum spin pump. In our model system, an applied electric field causes a spin gap to its critical ground state by introducing bond-alternation exchange interactions. We study quantum spin pumping at different quantized magnetization states and also explain physically the presence and absence of quantum spin pumping at different fractionally quantized magnetization states.

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