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

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

2009-11-26

arxiv.org/abs/0911.5007v2

New J. Phys. 12 (2010) 033048.

Physics

Condensed Matter

Strongly Correlated Electrons

40 pages, 12 figures

Scientific paper

10.1088/1367-2630/12/3/033048

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.

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