On the nature of the magnetic transition in a Mott insulator

Fleck, M.; Lichtenstein, A. I.; Zacher, M. G.; Hanke, W.; Oleś, A. M.

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On the nature of the magnetic transition in a Mott insulator

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Fleck, M.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Lichtenstein, A. I.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Oleś, A. M.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Fleck, M., Lichtenstein, A. I., Zacher, M. G., Hanke, W., & Oleś, A. M. (2004). On the nature of the magnetic transition in a Mott insulator. The European Physical Journal B, 37(4), 439-446.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F5ED-3

Abstract

Using a combination of exact enumeration and the dynamical mean-field
theory (DMFT) we study the drastic change of the spectral properties,
obtained in the half-filled two-dimensional Hubbard model at a
transition from an antiferromagnetic to a paramagnetic Mott insulator,
and compare it with the results obtained using the quantum Monte Carlo
method. The coherent hole (electron) quasiparticle spin-polaron
subbands are gradually smeared out when the AF order disappears, either
for increasing Coulomb repulsion U at fixed temperature T, or for
increasing T at fixed U. Within the DMFT we present numerical evidence
(a continuous disappearence of the order parameter) suggesting that the
above magnetic transition is second order both in two and in three
dimensions.