Excited states of quantum many-body interacting systems: A variational coupled-cluster description

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.

17 pages, 4 figures

References in corpus (1)

• A variational coupled-cluster study of magnon-density-wave excitations in quantum antiferromagnets

Cited by in corpus (1)

• A variational Jastrow coupled-cluster theory of quantum many-body systems