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Article
Multiparticle continuum in the excitation spectrum of the compound CsNiCl
Recent neutron scattering experiments on CsNiCl3 reveal some features that are not well described by the standard nonlinear σ model, nor by numerical simulations, for isolated S = 1 spin chains. In particular, i...
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Article
On \(\mathsf{c = 1}\) critical phases in anisotropic spin-1 chains
Quantum spin-1 chains may develop massless phases in presence of Ising-like and single-ion anisotropies. We have studied c = 1 critical phases by means of both analytical techniques, including a map** of the la...
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Article
Geometric phase for mixed states: a differential geometric approach
A new definition and interpretation of the geometric phase for mixed state cyclic unitary evolution in quantum mechanics are presented. The pure state case is formulated in a framework involving three selected...
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Article
Wigner distributions for finite dimensional quantum systems: An algebraic approach
We discuss questions pertaining to the definition of ‘momentum’, ‘momentum space’, ‘phase space’ and ‘Wigner distributions’; for finite dimensional quantum systems. For such systems, where traditional concepts...
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Article
Stable particles in anisotropic spin-1 chains
Motivated by field-theoretic predictions we investigate the stable excitations that exist in two characteristic gapped phases of a spin-1 model with Ising-like and single-ion anisotropies. The sine-Gordon the...
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Article
Ray space ‘Riccati’ evolution and geometric phases for N-level quantum systems
We present a simple derivation of the matrix Riccati equations governing the reduced dynamics as one descends from the group $$ \mathb...
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Article
From the equations of motion to the canonical commutation relations
The problem of whether or not the equations of motion of a quantum system determine the commutation relations was posed by E. P. Wigner in 1950. A similar problem (known as “The Inverse Problem in the Calculus of...
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Article
Magnetic properties of commensurate Bose-Bose mixtures in one-dimensional optical lattices
We investigate magnetic properties of strongly interacting bosonic mixtures confined in one dimensional geometries, focusing on recently realized 87Rb-41K gases with tunable interspecies interactions. By combinin...