Bellotti, F. F.Frederico, T.Yamashita, Marcelo Takeshi [UNESP]Fedorov, D. V.Jensen, A. S.Zinner, N. T.2014-05-272014-05-272013-01-11Physical Review A - Atomic, Molecular, and Optical Physics, v. 87, n. 1, 2013.1050-29471094-1622http://hdl.handle.net/11449/74372The momentum distribution is a powerful probe of strongly interacting systems that are expected to display universal behavior. This is contained in the contact parameters which relate few- and many-body properties. Here we consider a Bose gas in two dimensions and explicitly show that the two-body contact parameter is universal and then demonstrate that the momentum distribution at next-to-leading order has a logarithmic dependence on momentum which is vastly different from the three-dimensional case. Based on this, we propose a scheme for measuring the effective dimensionality of a quantum many-body system by exploiting the functional form of the momentum distribution. © 2013 American Physical Society.engBose gasContact parametersDimensional effectsFunctional formsInteracting systemLogarithmic dependenceMany-bodyMomentum distributionsNext-to-leading ordersQuantum many-body systemsTwo-dimensionUniversal behaviorsOligomersQuantum theoryMomentumArtigo10.1103/PhysRevA.87.013610WOS:000313422800003Acesso restrito2-s2.0-848723097052-s2.0-84872309705.pdf3740639726545315