328 citations
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5 papers · 1 filter
Equivalence of Bose-Einstein condensation and symmetry breaking
Andras Suto
Based on a classic paper by Ginibre [Commun. Math. Phys. {\bf 8} 26 (1968)] it is shown that whenever Bogoliubov's approximation, that is, the replacement of a_0 and a_0^* by compl…
A computable measure of nonclassicality for light
J. K. Asbóth, J. Calsamiglia, H. Ritsch
We propose the Entanglement Potential (EP) as a measure of nonclassicality for quantum states of a single-mode electromagnetic field. It is the amount of two-mode entanglement that…
Slow two-level systems in point contacts
A. Halbritter, L. Borda, A. Zawadowski
A great variety of experiments, like heat release measurements, acoustic measurements, and transport measurements on mesoscopic samples have proved that two level systems (TLSs) ha…
Cyclic exchange, isolated states and spinon deconfinement in an XXZ Heisenberg model on the checkerboard lattice
Nic Shannon, Gregoire Misguich, Karlo Penc
The antiferromagnetic Ising model on a checkerboard lattice has an ice-like ground state manifold with extensive degeneracy. and, to leading order in J_xy, deconfined spinon excita…
Logarithmic corrections in the two-dimensional Ising model in a random surface field
M. Pleimling, F. A. Bagamery, L. Turban +1
In the two-dimensional Ising model weak random surface field is predicted to be a marginally irrelevant perturbation at the critical point. We study this question by extensive Mont…