NMR relaxation in the spin-1 Heisenberg chain
Sandvik, Anders W.
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Citation (published version)Sylvain Capponi, Maxime Dupont, Anders W Sandvik, Pinaki Sengupta. "NMR relaxation in the spin-1 Heisenberg chain." Physical Review B, Volume 100, Issue 9, 2019. https://doi.org/10.1103/physrevb.100.094411
We consider the isotropic S=1 Heisenberg chain with a finite Haldane gap Δ and use state-of-the-art numerical techniques to investigate its dynamical properties at finite temperature, focusing on the nuclear spin-lattice relaxation rate 1/T1 measured in nuclear magnetic resonance (NMR) experiments, for instance. In particular, we analyze the contributions from modes with momenta close to q≈0 and q≈π as a function of temperature. At high-temperature we observe spin diffusion, while at low-temperature we argue that a simple activated behavior 1/T1∝exp(−Δ/T) can be observed only at temperatures much smaller than the gap Δ.