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Spin Chain in Magnetic Field: Limitations of the Large-N Mean-Field Theory

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Wohlfeld K., Chen C.-C., van Veenendaal M., Devereaux T.

Motivated by the recent success in describing the spin and orbital spectrum of a spin-orbital chain using a large-N mean-field approximation, we apply the same formalism to the case of a spin chain in the external magnetic field. It occurs that in this case, which corresponds to N=2 in the approximation, the large-N mean-field theory cannot qualitatively reproduce the spin excitation spectra at high magnetic fields, which polarize more than 50% of the spins in the magnetic ground state. This, rather counterintuitively, shows that the physics of a spin chain can under some circumstances be regarded as more complex than the physics of a spin-orbital chain.

Reiter's Polaron Wave Function Applied to a t rm_{2g} Orbital t-J Model

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Wohlfeld K., Oleś A., Daghofer M., Horsch P.

Acta Physica Polonica A

2009

vol. 115

issue 1

110-113

Using the self-consistent Born approximation we calculate Reiter's wave function for a single hole introduced into the undoped and orbitally ordered ground state of the t-J model with t_{2g} orbital degrees of freedom. While the number of excitations is similar to the spin t-J model for a given J/t, a distinct structure of the calculated wave function and its momentum dependence is identified suggesting the formation of a novel type of mobile polarons.

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2 Acta Physica Polonica A

1 2015

1 2009

2 Wohlfeld K.

1 Chen C.-C.

1 Daghofer M.

1 Devereaux T.

1 Horsch P.

1 Oleś A.

1 van Veenendaal M.

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Spin Chain in Magnetic Field: Limitations of the Large-N Mean-Field Theory

Reiter's Polaron Wave Function Applied to a t rm_{2g} Orbital t-J Model