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

Abstract

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.

13 pages, 7 figures, revtex

References in corpus (9)

• Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material
• One- and Two-Triplon Spectra of a Cuprate Ladder
• Finite-temperature lineshapes in gapped quantum spin chains
• Field-Controlled Magnetic Order in the Quantum Spin-Ladder System (Hpip)2CuBr4
• Universal relaxational dynamics of gapped one dimensional models in the quantum sine-Gordon universality class
• Mesoscopic Phase Coherence in a Quantum Spin Fluid
• Finite temperature correlation function for one-dimensional Quantum Ising model: the virial expansion
• Finite Temperature Dynamics of the Spin 1/2 Bond Alternating Heisenberg Antiferromagnetic Chain
• Integral equations and large-time asymptotics for finite-temperature Ising chain correlation functions