Low-Temperature Dynamical Structure Factor of the Two-Leg Spin-1/2 Heisenberg Ladder

Details Low-Temperature Dynamical Structure Factor of the Two-Leg Spin-1/2 Heisenberg Ladder Low-Temperature Dynamical Structure Factor of the Two-Leg Spin-1/2 Heisenberg Ladder

2010-05-04

arxiv.org/abs/1005.0492v2

Phys. Rev. B 82, 104417 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 7 figures, revtex

Scientific paper

10.1103/PhysRevB.82.104417

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 lineshape of this mode broadens in a non-symmetric 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.

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