23 citations · 181 across the 17 of their papers we have counts for
18 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…
Mixed-spin Heisenberg ladders in a magnetic field
D. S. Almeida, A. S. Bibiano, W. M. da Silva +1
In this work, we study alternating mixed-spin Heisenberg ladders in the magnetic field using density matrix renormalization group and linear spin-wave calculations. The…
Ferrimagnetic and Haldane-type phases in a mixed-spin -- quantum trimer chain
A. Felinto, R. R. Montenegro-Filho
Bipartite Lieb-Mattis ferrimagnetism and the symmetry-protected Haldane phase are paradigmatic mechanisms in quasi-one-dimensional quantum magnets. Both emerge, in distinct regimes…
Competing spin-1 and spin-2 regimes in a frustrated four-leg spin-1/2 ladder
D. S. Almeida, R. R. Montenegro-Filho
We investigate a frustrated four-leg spin- ladder using density matrix renormalization group calculations. The uniform system displays three regimes: short-range antiferromagn…
Quantum bicritical point and phase separation in a frustrated Heisenberg ladder
D. S. Almeida, R. R. Montenegro-Filho
We use the density matrix renormalization group (DMRG) and a hard-core boson map to investigate the quantum phase transitions present in the phase diagram of the frustrated Heisenb…
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…