Ground state and spectral properties across a Charge Density Wave transition in a triangular-lattice spinless Fermion model

Abstract

We study ground state properties and particle excitation spectra across a commensurate charge density wave transition in a system of strongly interacting fermions, using series expansion methods and mean-field theory. We consider a 1/3-filled system of spinless fermions on a triangular-lattice, with hopping parameter $t$, nearest-neighbor repulsion $V$, and a sublattice dependent chemical potential ${\mu }_s$. The phase transition is found to be first order for ${\mu }_s=0$, but becomes continuous with increasing ${\mu }_s$. The particle and hole excitation spectra exhibit dramatic changes in the vicinity of the phase transitions and in the charge-density wave ordered phase. We discuss the relevance of this study to the Pinball Fermi liquid phase postulated theoretically in earlier studies as well as to various strongly correlated triangular-lattice materials.

8 pages, 8 figures

References in corpus (11)

• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Striped superconductors: How the cuprates intertwine spin, charge and superconducting orders
• Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy
• Sign-problem-free quantum Monte Carlo of the onset of antiferromagnetism in metals
• Fermi surface evolution and Luttinger theorem in Na${}_x$CoO${}_2$: a systematic photoemission study
• ARPES on Na${}_{0.6}$CoO${}_2$: Fermi surface, extended flat dispersion, and unusual band splitting
• Strong coupling theory of the spinless charges on the triangular lattices: possibility of a new quantum liquid
• Numerical Linked-Cluster Algorithms. II. t-J models on the square lattice
• Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3
• Key issues in theories of high temperature superconductors
• Stripes and electronic quasiparticles in the pseudogap state of cuprate superconductors