Magnetic phase diagram of the Hubbard model with next-nearest-neighbour hopping

被引：19

作者：

Peters, R. ^{[1
]}

Pruschke, T. ^{[1
,2
]}

机构：

[1] Univ Gottingen, Dept Phys, D-37077 Gottingen, Germany

[2] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

来源：

NEW JOURNAL OF PHYSICS | 2009年 / 11卷

关键词：

MEAN-FIELD THEORY; RENORMALIZATION-GROUP; TRANSITION METALS; GROUND-STATES; FERROMAGNETISM; SYSTEMS; INSULATOR; ANTIFERROMAGNETISM; SUPERCONDUCTORS; MANGANITES;

D O I：

10.1088/1367-2630/11/8/083022

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the magnetic phase diagram of the Hubbard model for a Bethe lattice with nearest-neighbour (NN) hopping t(1) and next-nearest-neighbour (NNN) hopping t(2) in the limit of infinite coordination. We use the amplitude t(2)/t(1) of the NNN hopping to tune the density of states (DOS) of the non-interacting system from a situation with particle-hole symmetry to an asymmetric one with van-Hove singularities at the lower (t(2)/t(1)>0) respectively upper (t(2)/t(1)<0) band edge for large enough |t(2)/t(1)|. For this strongly asymmetric situation, we find rather extended parameter regions with ferromagnetic states and regions with antiferromagnetic states.

引用

页数：13

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