Low-temperature dynamical structure factor of the two-leg spin-1/2 Heisenberg ladder
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 t...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2010
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| Summary: | 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. © 2010 The American Physical Society. |
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