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Role of initial conditions in the dynamics of quantum glassy systems
(IOP Publishing, 2019-02-25)
We set the formalism to study the way in which the choice of canonical equilibrium initial conditions affect the real-time dynamics of quantum disordered models. We use a path integral formulation on a time contour with ...
The Ground State Energy per Site of the Quantum and Classical Edwards-Anderson Spin Glass in the Thermodynamic Limit
(SPRINGERNEW YORK, 2012)
We derive general rigorous lower bounds for the average ground state energy per site e ((d)) of the quantum and classical Edwards-Anderson spin-glass model in dimensions d=2 and d=3 in the thermodynamic limit. For the ...
Unconventional critical activated scaling of two-dimensional quantum spin glasses
(American Physical Society, 2016-07)
We study the critical behavior of two-dimensional short-range quantum spin glasses by numerical simulations. Using a parallel tempering algorithm, we calculate the Binder cumulant for the Ising spin glass in a transverse ...
Critical behavior of the 2D Ising model modulated by the Octonacci sequence
(IOP Publishing, 2020)
Absence of conventional quantum phase transitions in itinerant systems with disorder
(American Physical SocCollege PkEUA, 2005)
Non equilibrium dynamics of isolated disordered systems: The classical Hamiltonian p-spin model
(IOP Publishing, 2017-08)
We study the dynamics of a classical disordered macroscopic model completely isolated from the environment reproducing, in a classical setting, the 'quantum quench' protocol. We show that, depending on the pre and post ...
Vidro de spin fermiônico em duas sub-redes com campo transverso: solução com quebra da simetria de réplicas
(Universidade Federal de Santa MariaBrasilFísicaUFSMPrograma de Pós-Graduação em FísicaCentro de Ciências Naturais e Exatas, 2007-06-01)
In the present work, a fermionic infinite-range Ising spin glass (SG) model with a transverse field Γ is studied. The model is analyzed in a one-lattice structure (quantum SG) and in a two-sublattice structure (SG/antife ...
Transicões inversas em modelos fermiônicos de vidro de spin
(Universidade Federal de Santa MariaBRFísicaUFSMPrograma de Pós-Graduação em Física, 2010-08-26)
The present work studies inverse transitions by using two spin glass models: the infinite-range fermionic Ising spin glass (FISG) in the presence of a transverse magnetic field
¡ and Hopfield fermionic Ising spin glass ...
Transições de primeira ordem no modelo vidro de spin ising fermiônico em um campo transverso
(Universidade Federal de Santa MariaBRFísicaUFSMPrograma de Pós-Graduação em Física, 2006-10-31)
The present work analyzes the fermionic Ising spin glass model in a transverse magnetic field. The problem is written in the Grand Canonical ensemble with the spin operators represented by bilinear combinations of fermionic ...