Low Temperature Electron Spin Resonance Theory for Half-Integer Spin Antiferromagnetic Chains

Garrett E. Granroth

Masaki Oshikawa

A field theory approach to ESR in S = 1/2 Heisenberg antiferromagnetic chains is developed. For an exchange anisotropy perturbation, the lineshape is shown to be Lorentzian and the width is proportional to the temperature in the low temperature regime.

Subir Sachdev A

Nuclear relaxation in half-integer spin chains at low temperatures (T\ensuremath{\ll}J, the antiferromagnetic exchange constant) is dominated by dissipation from a gas of thermally excited, overdamped, spinons. The universal low-temperature dependence of the relaxation rates 1/${\mathit{T}}_{1}$ and 1/${\mathit{T}}_{2\mathit{G}}$ is computed.

Tai Kai Ng, SJ Qin, Zb Su

Changfeng Chen

Jesko Sirker, Nicolas Laflorencie