Magnetic Properties of the Hubbard Model on Kagome Stripes

• Authors: O. Derzhko , M. Maksymenko , J. Richter , A. Honecker , R. Moessner
• Languages of publication: EN

Abstracts

EN

We consider the one-orbital N-site repulsive Hubbard model on two kagome like chains, both of which yield a completely dispersionless (flat) one-electron band. Using exact many-electron ground states in the subspaces with n ≤ n_{max} (n_{max} ∝ N) electrons, we calculate the square of the total spin in the ground state to discuss magnetic properties of the models. We have found that although for n < n_{max} the ground states contain fully polarized states, there is no finite region of electron densities n/{\cal N} < 1 ({\cal N} = N/3 or {\cal N} = N/5) where ground-state ferromagnetism survives for {\cal N} → ∞.

Keywords

EN

71.10.-w

Discipline

• 71.10.-w: Theories and models of many-electron systems

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 5
• Pages: 736-737

Dates

published

2010-11

Contributors

author

O. Derzhko

• Institute for Condensed Matter Physics, NAS of Ukraine, 1 Svientsitskii Str., L'viv-11, 79011, Ukraine
• Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany

author

M. Maksymenko

• Institute for Condensed Matter Physics, NAS of Ukraine, 1 Svientsitskii Str., L'viv-11, 79011, Ukraine

author

J. Richter

• Institut für Theoretische Physik, Universität Magdeburg, P.O. Box 4120, 39016 Magdeburg, Germany

author

A. Honecker

• Institut für Theoretische Physik, Georg-August-Universität, F.-Hund-Pl. 1, 37077 Göttingen, Germany

author

R. Moessner

• Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany

References

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• 8. O. Derzhko, J. Richter, A. Honecker, M. Maksymenko, R. Moessner, Phys. Rev. B 81, 014421 (2010)

Identifiers

DOI

10.12693/APhysPolA.118.736