RT Journal Article
T1 Continuous unitary transformations in two-level boson systems
A1 Dusuel, Sébastien
A1 Vidal, Julien
A1 Arias Carrasco, José Miguel
A1 Dukelsky, J.
A1 García Ramos, José Enrique
K1 Bosones
AB Two-level boson systems displaying a quantum phase transition from a spherical (symmetric) toa 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-fieldtreatment are deduced by using the continuous unitary transformations technique. In this scheme, a1/N expansion for different observables is proposed and allows one to compute the finite-size scalingexponents at the critical point. Analytical and numerical results are compared and reveal the powerof the present approach to compute the finite-size corrections in such a context.
PB American Physical Society
SN 0556-2813
YR 2005
FD 2005-12-30
LK http://hdl.handle.net/10272/5500
UL http://hdl.handle.net/10272/5500
LA eng
NO Dusuel, S., Vidal, J., Arias Carrasco, J.M., Dukelsky, J., García Ramos, J. E.: "Continuous unitary transformations in two-level boson systems". Physical Review C. Vol. 72, n. 6 (2005). ISSN 0556-2813
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026