Hole dynamics and photoemission in a model for
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Contributors
Abstract
The motion of a single hole in a (Formula presented) model for the two-dimensional spin-gap compound (Formula presented) is investigated. The undoped Heisenberg model for this system has an exact dimer eigenstate and shows a phase transition between a dimerized and a Néel phase at a certain ratio of the magnetic couplings. We calculate the photoemission spectrum in the disordered phase using a generalized spin-polaron picture. By varying the interdimer hopping parameters we find a crossover between a narrow quasiparticle band regime known from other strongly correlated systems and free-fermion behavior. The hole motion in the Néel-ordered phase is also briefly considered.
Details
Original language | English |
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Pages (from-to) | 11309-11312 |
Number of pages | 4 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 61 |
Issue number | 17 |
Publication status | Published - 2000 |
Peer-reviewed | Yes |
Externally published | Yes |