@article{10272/5500,
year = {2005},
month = {12},
url = {http://hdl.handle.net/10272/5500},
abstract = {Two-level boson systems displaying a quantum phase transition from a spherical (symmetric) to
a deformed (broken) phase are studied. A formalism to diagonalize Hamiltonians with O(2L + 1)
symmetry for large number of bosons is worked out. Analytical results beyond the simple mean-field
treatment are deduced by using the continuous unitary transformations technique. In this scheme, a
1/N expansion for different observables is proposed and allows one to compute the finite-size scaling
exponents at the critical point. Analytical and numerical results are compared and reveal the power
of the present approach to compute the finite-size corrections in such a context.},
publisher = {American Physical Society},
keywords = {Bosones},
title = {Continuous unitary transformations in two-level boson systems},
doi = {10.1103/PhysRevC.72.064332},
author = {Dusuel, Sébastien and Vidal, Julien and Arias Carrasco, José Miguel and Dukelsky, J. and García Ramos, José Enrique},
}