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179.621  Articles
1 of 17.963 pages  |  10  records  |  more records»
We study magnetic properties of ordered phase in Heisenberg model on a non-Bravais lattice by means of Popov - Fedotov trick, which takes into account a rigorous constraint of a single occupancy. We derive magnetization and free energy using sadle point a... see more

We study the magnetic ordered phases of the spin -12-\frac{1}{2} Heisenberg antiferromagnetic model with nearest J1J_1 and next nearest neighbor J2J_2 exchange interactions on the square lattice using fermionic representation of spin operators within Pop... see more

This paper deals with the application of operatorial techniques of quantum physics to a theoretical model of closed ecosystems. The model is built by using fermionic operators whose evolution is ruled by a self--adjoint Hamiltonian operator. Adopting Heis... see more

The Heisenberg Lie Group is the most frequently used model for studying the representation theory of Lie groups. This Lie group is modular-noncompact and its Lie algebra is nilpotent. The elements of Heisenberg Lie group and algebra  can be expressed... see more

In a first part, we are concerned with the relationships between polynomials in the two generators of the algebra of Heisenberg—Weyl, its Bargmann—Fock representation with differential operators and the associated one-parameter group.Upon this basis, the ... see more

We present a general formalism for giving a measure space paired with a separable Hilbert space a quantum version based on a normalized positive operator-valued measure. The latter are built from families of density operators labeled by points of the meas... see more

The equilibrium magnetic and entanglement properties in a spin-1/2 Ising-Heisenberg model on a triangulated Kagomé lattice are analyzed by means of the effective field for the Gibbs-Bogoliubov inequality. The calculation is reduced to decoupled individual... see more

AbstractThe famous premise of John Polkinghorne, ‘epistemology models ontology’, has been assessed in this article. It is interpreted that its logic is based on a linear trajectory of knowledge ? being. Polkinghorne places much emphasis on the fact that h... see more

We study the Néel state of the spin 1/2 Heisenberg antiferromagnet model on hypercubic and triangular lattices, employing an auxiliary fermion representation for spin operators with Popov-Fedotov trick. The unphysical states are eliminated on each site b... see more

1 of 17.963 pages  |  10  records  |  more records»