48 citations · 88 across the 11 of their papers we have counts for
11 papers
Magnetic enhancement and Hall conductivity of excitonic insulators in a Gross--Neveu type model
William R. Tavares, Rudnei O. Ramos, Nei Lopes
We study the effects of a perpendicular magnetic field on the excitonic insulator (EI) phase in the semiconductor regime using an extended planar four-Fermi model. Within the large…
Competition and coexistence of superconductivity and nematic order in a two-dimensional electron gas with quadrupolar interactions
Nei Lopes, Guilherme da Silva do Vale, Daniel G. Barci
We investigate the interplay between superconductivity and nematic order in a two-dimensional electron gas with competing pairing and quadrupolar forward-scattering interactions. T…
Critical and non critical non-Hermitian topological phase transitions in one dimensional chains
Rui Aquino, Nei Lopes, Daniel G. Barci
In this work we investigate non-Hermitian topological phase transitions using real-space edge states as a paradigmatic tool. We focus on the simplest non-Hermitian variant of the S…
Incommensurate charge density wave on multiband intermetallic systems exhibiting competing orders
Nei Lopes, Daniel Reyes, Natanael C. Costa +2
The appearance of an incommensurate charge density wave vector on multiband intermetallic systems presenting commensurate charge density wave (CDW) and sup…
Excitonic insulators and Gross-Neveu models
Nei Lopes, Mucio A. Continentino, Daniel G. Barci
We introduce a generalized Gross-Neveu (GN) model to describe the excitonic instabilities in two different systems: a small overlap semi-metal (SM) and a small gap semi-conductor (…
Interplay between charge density wave and superconductivity in multi-band systems with inter-band Coulomb interaction
Nei Lopes, Daniel Reyes, Mucio A. Continentino +1
In this work we study the competition or coexistence between charge density wave (CDW) and superconductivity (SC) in a two-band model system in a square lattice. One of the bands h…