Low-temperature dynamical structure factor of the two-leg spin-1/2 Heisenberg ladder

Article

关键词: EXCITATION SPECTRUM;    CHAIN;    S=1/2;    MODELS;   

DOI  :  10.1103/PhysRevB.82.104417

来源: SCIE

【 摘 要 】

We determine the dynamical structure factor of the two-leg spin-1/2 Heisenberg ladder at low temperatures in the regime of strong rung coupling. The dominant feature at zero temperature is the coherent triplon mode. We show that the line shape of this mode broadens in a nonsymmetric way at finite temperatures and that the degree of asymmetry increases with temperature. We also show that at low frequencies, a temperature-induced resonance akin to the Villain mode in the spin-1/2 Heisenberg Ising chain emerges.

【 授权许可】

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