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Excited states of quantum many-body interacting systems: A variational coupled-cluster description | | Y. Xian
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19 Jan 2007 | | Subject: | Other | | Abstract: | We extend recently proposed variational coupled-cluster method to describe excitation states of quantum many-body interacting systems. We discuss, in general terms, both quasiparticle excitations and quasiparticle-density-wave excitations (collective modes). In application to quantum antiferromagnets, we reproduce the well-known spin-wave excitations, i.e. quasiparticle magnons of spin $pm 1$. In addition, we obtain new, spin-zero magnon-density-wave excitations which has been missing in Anserson’s spin-wave theory. Implications of these new collective modes are discussed. | | Source: | arXiv, cond-mat/0701482 | | Services: | Forum | Review | PDF | Favorites | |
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