140 citations · 501 across the 22 of their papers we have counts for
22 papers
Trimers in the Extended Hubbard Model
R. R. Montenegro-Filho, D. R. B. Silva, D. Cogollo +1
The Lieb theorem is a cornerstone of quantum magnetism theory in condensed matter. In this work, we investigate the instability of the Lieb insulating ferrimagnetic phase in the ex…
Ground-state phase diagram and thermodynamics of coupled trimer chains
R. R. Montenegro-Filho, E. J. P. Silva-Junior, M. D. Coutinho-Filho
The density matrix renormalization group and quantum Monte Carlo method are used to describe coupled trimer chains in a magnetic field h. The Hamiltonian contains exchange terms in…
Topology of many-body edge and extended quantum states in an open spin chain: 1/3--plateau, Kosterlitz-Thouless transition, and Luttinger liquid
R. R. Montenegro-Filho, F. S. Matias, M. D. Coutinho-Filho
Quantum many-body edge and extended magnon excitations from the 1/3 -- plateau of the anisotropic Heisenberg model on an open AB chain in a magnetic field are unveiled usin…
Edge states in trimer lattices
V. M. Martinez Alvarez, M. D. Coutinho-Filho
Topological phases of matter have attracted much attention over the years. Motivated by analogy with photonic lattices, here we examine the edge states of a one-dimensional trimer…
Fractional exclusion statistics and thermodynamics of the Hubbard chain in the spin-incoherent Luttinger liquid regime
Carlindo Vitoriano, R. R. Montenegro-Filho, M. D. Coutinho-Filho
Bethe ansatz and bosonization procedures are used to describe the thermodynamics of the strong-coupled Hubbard chain in the \textit{spin-incoherent} Luttinger liquid (LL) regime: $…
Lieb and hole-doped ferrimagnetism, spiral, resonating valence-bond states, and phase separation in large-U Hubbard chains
V. M. Martinez Alvarez, M. D. Coutinho-Filho
The ground state (GS) properties of the quasi-one-dimensional Hubbard model are investigated taking the effects of charge and spin quantum fluctuations on equal footing. In…