Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-16
Phys. Rev. B 73, 184426 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 8 figures
Scientific paper
10.1103/PhysRevB.73.184426
We present results for the dynamic structure factor of the S=1/2 bond alternating Heisenberg chain over a large range of frequencies and temperatures. Data are obtained from a numerical evaluation of thermal averages based on the calculation of all eigenvalues and eigenfunctions for chains of up to 20 spins. Interpretation is guided by the exact temperature dependence in the noninteracting dimer limit which remains qualitatively valid up to an interdimer exchange $\lambda \approx 0.5$. The temperature induced central peak around zero frequency is clearly identified and aspects of the crossover to spin diffusion in its variation from low to high temperatures are discussed. The one-magnon peak acquires an asymmetric shape with increasing temperature. The two-magnon peak is dominated by the S=1 bound state which remains well defined up to temperatures of the order of J. The variation with temperature and wavevector of the integrated intensity for one and two magnon scattering and of the central peak are discussed.
Luckmann C.
Mikeska Hans-J"urgen
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