Zobrazeno 1 - 10
of 96
pro vyhledávání: '"Coutinho Filho, M. D."'
Publikováno v:
Phys. Rev. B 105, 134423 (2022)
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 involving the intra-trimer coupling J1 (taken as the unit of energy) and
Externí odkaz:
http://arxiv.org/abs/2204.11186
Publikováno v:
Phys. Rev. B 102, 035137 (2020)
Quantum many-body edge and extended magnon excitations from the 1/3 -- plateau of the anisotropic Heisenberg model on an open AB$_2$ chain in a magnetic field $h$ are unveiled using the density matrix renormalization group and exact diagonalization.
Externí odkaz:
http://arxiv.org/abs/2007.10414
Publikováno v:
Phys. Rev. A 99, 013833 (2019)
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 lattice in the phases with and without inversion symmetry protection.
Externí odkaz:
http://arxiv.org/abs/1810.05566
Publikováno v:
Phys. Rev. B 98, 085130 (2018)
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: $J(\equiv 4t^2/U)\ll k_B T\ll E_F$, where $t$ is the hopping amplitude,
Externí odkaz:
http://arxiv.org/abs/1808.09159
The ground state (GS) properties of the quasi-one-dimensional $AB_2$ Hubbard model are investigated taking the effects of charge and spin quantum fluctuations on equal footing. In the strong-coupling regime, we derive a low-energy Lagrangian suitable
Externí odkaz:
http://arxiv.org/abs/1702.03609
Autor:
Queiroz, L. M., Coutinho-Filho, M. D.
Publikováno v:
J. Stat. Mech. (2017) 013302
Monte Carlo simulations of layered BSCCO samples are used to investigate the behavior of vortex matter at low fields, particularly in connection with the possible occurrence of a Bragg glass (BrG) phase at low density of columnar defects, a phenomeno
Externí odkaz:
http://arxiv.org/abs/1609.00558
We propose a topological approach suitable to establish a connection between thermodynamics and topology in the microcanonical ensemble. Indeed, we report on results that point to the possibility of describing {\it interacting classical spin systems}
Externí odkaz:
http://arxiv.org/abs/1607.00829
Publikováno v:
Phys. Rev. B 80, 054409 (2009)
We present the ground state phase diagram of $q = 1/2$ quantum-rotor chains with competing interactions (frustration) calculated through cluster variational mean field approaches. We consider two interaction patterns, named F$_1$ and F$_2$ models, be
Externí odkaz:
http://arxiv.org/abs/1602.05383
Publikováno v:
Physical Review E 88, 033022 (2013)
We use a lattice gas cellular automata model in the presence of random dynamic scattering sites and quenched disorder in the two-phase immiscible model with the aim of producing an interface dynamics similar to that observed in Hele-Shaw cells. The d
Externí odkaz:
http://arxiv.org/abs/1508.00913
Publikováno v:
Phys. Rev. B 90, 115123 (2014)
We discuss the rich phase diagram of doped AB2 $t-J$ chains by using data from density matrix renormalization group and exact diagonalization techniques. The $J$ vs $\delta$ (hole doping) phase diagram exhibits regions of itinerant ferrimagnetism, in
Externí odkaz:
http://arxiv.org/abs/1504.01951