تقرير
Magnetic field induced semimetal-to-canted-antiferromagnet transition on the honeycomb lattice
| العنوان: | Magnetic field induced semimetal-to-canted-antiferromagnet transition on the honeycomb lattice |
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| المؤلفون: | Bercx, M., Lang, T. C., Assaad, F. F. |
| المصدر: | Phys. Rev. B 80, 045412 (2009) |
| سنة النشر: | 2009 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | It is shown that the semimetallic state of the two-dimensional honeycomb lattice with a point-like Fermi surface is unstable towards a canted antiferromagnetic insulator upon application of an in-plane magnetic field. This instability is already present at the mean-field level; the magnetic field shifts the up- and the down-spin cones in opposite directions thereby generating a finite density of states at the Fermi surface and a perfect nesting between the up- and the down-spin Fermi sheets. This perfect nesting triggers a canted antiferromagnetic insulating state. Our conclusions, based on mean-field arguments, are confirmed by auxiliary field projective quantum Monte Carlo methods on lattices up to $12 \times 12$ unit cells. Comment: 7 pages, 8 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.80.045412 |
| URL الوصول: | http://arxiv.org/abs/0902.2922 |
| رقم الأكسشن: | edsarx.0902.2922 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.80.045412 |
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