Quantum Lifshitz point in the infinite dimensional Hubbard model

Details Quantum Lifshitz point in the infinite dimensional Hubbard model Quantum Lifshitz point in the infinite dimensional Hubbard model

2006-11-22

arxiv.org/abs/cond-mat/0611583v2

Phys. Rev. Lett. 98, 176404 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.176404

We show that the Gutzwiller variational wave function is surprisingly accurate for the computation of magnetic phase boundaries in the infinite dimensional Hubbard model. This allows us to substantially extend known phase diagrams. For both the half-hypercubic and the hypercubic lattice a large part of the phase diagram is occupied by an incommensurate phase, intermediate between the ferromagnetic and the paramagnetic phase. In case of the hypercubic lattice the three phases join at a new quantum Lifshitz point at which the order parameter is critical and the stiffness vanishes.

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