Fermionic Quasiparticle Representation of Tomonaga-Luttinger Hamiltonian

Details Fermionic Quasiparticle Representation of Tomonaga-Luttinger Hamiltonian Fermionic Quasiparticle Representation of Tomonaga-Luttinger Hamiltonian

2004-11-16

arxiv.org/abs/cond-mat/0411405v2

Eur.Phys.J. B47 (2005) 193-206

Physics

Condensed Matter

Strongly Correlated Electrons

In the new version two new appendices are added, several errors and misprints are corrected; 19 pages, 3 eps figures

Scientific paper

10.1140/epjb/e2005-00312-3

We find a unitary operator which asymptotically diagonalizes the Tomonaga-Luttinger hamiltonian of one-dimensional spinless electrons. The operator performs a Bogoliubov rotation in the space of electron-hole pairs. If bare interaction of the physical electrons is sufficiently small this transformation maps the original Tomonaga-Luttinger system on a system of free fermionic quasiparticles. Our representation is useful when the electron dispersion deviates from linear form. For such situation we obtain non-perturbative results for the electron gas free energy and the density-density propagator.

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