Transverse spin helices in XXZ chains with single-ion anisotropy decay slowly for chosen wave numbers and can be stabilized by easy-axis exchange anisotropy, per iTEBD simulations and spin-wave estimates.
For a periodicN-site system the Bose operators are related to the spin-helix amplitude byA= 1−P k ˆa† kˆak/(N S)
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Decay of spin helices in XXZ quantum spin chains with single-ion anisotropy
Transverse spin helices in XXZ chains with single-ion anisotropy decay slowly for chosen wave numbers and can be stabilized by easy-axis exchange anisotropy, per iTEBD simulations and spin-wave estimates.