Dimensional tuning of electronic states under strong and frustrated interactions

Abstract

We study a model of strongly interacting spinless fermions on an anisotropic triangular lattice. At half-filling and the limit of strong repulsive nearest-neighbor interactions, the fermions align in stripes and form an insulating state. When a particle is doped, it either follows a one-dimensional free motion along the stripes or fractionalizes perpendicular to the stripes. The two propagations yield a dimensional tuning of the electronic state. We study the stability of this phase and derive an effective model to describe the low-energy excitations. Spectral functions are presented which can be used to experimentally detect signatures of the charge excitations.

4pages 4figures included. to appear in Phys. Rev. Lett. vol. 100

References in corpus (4)

• Supersolid hardcore bosons on the triangular lattice
• Strong coupling theory of the spinless charges on the triangular lattices: possibility of a new quantum liquid
• Correlated Fermions on a Checkerboard Lattice
• Domain-wall excitons and optical conductivity in one-dimensional Wigner lattices

Cited by in corpus (1)

• Finite energy spectral function of an anisotropic 2D system of coupled Hubbard chains