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Adapted continuous unitary transformation to treat systems with quasiparticles of finite lifetime

An improved generator for continuous unitary transformations is introduced to describe systems with unstable quasiparticles. Its general properties are derived and discussed. To illustrate this approach we investigate the asymmetric antiferromagnetic spin-1/2 Heisenberg ladder which allows for spontaneous triplon decay. We present results for the low energy spectrum and the momentum resolved spectral density of this system. In particular, we show the resonance behavior of the decaying triplon explicitly.

preprint2010arXivOpen access
Tim FischerSebastian DuffeGötz S. Uhrig
cond-mat.str-el
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Open access3 authors1 topic
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Tim FischerSebastian DuffeGötz S. Uhrig

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