Spin correlation functions and decay of quasiparticles inXXZspin chain atT>0
| Autor: | Poboiko Igor, Feigelman Mikhail |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Condensed matter physics Scattering Wave packet 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Omega Correlation function 0103 physical sciences Quasiparticle Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Excitation Spin-½ |
| Zdroj: | Physical Review B. 94 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We study one-dimensional anisotropic XXZ spin-$\frac12$ model with ferromagnetic sign of the coupling and $z-z$ exchange constant $J_z = \Delta J$, where $\Delta < 1$, and $J$ is the coupling within XY spin plane. We calculate damping of low-energy excitations with $\omega \ll T $ due to their scattering from thermal excitation bath with temperature $T \ll J$, taking into account nonzero curvature of the excitation spectrum, $\epsilon(q) = u q + \delta\epsilon(q)$. We calculate also longitudinal spin-spin correlation function $\langle S^z(x,t)S^z(0,0) \rangle$ at $x \approx ut$ and find the shape of the spreading "wave packet". |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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