科研之友
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摘要
Universal behavior has been found inside the window of Efimov physics for systems with N = 4,5,6 particles. Efimov physics refers to the emergence of a number of three-body states in systems of identical bosons interacting via a short-range interaction becoming infinite at the verge of binding two particles. These Efimov states display a discrete scale invariance symmetry, with the scaling factor independent of the microscopic interaction. Their energies in the limit of zero-range interaction can be parametrized, as a function of the scattering length, by a universal function. We have found, using the form of finite-range scaling introduced by A. Kievsky and M. Gattobigio [Phys. Rev A 87, 052719 (2013)], that the same universal function can be used to parametrize the ground and excited energy of N %26lt;= 6 systems inside the Efimov-physics Moreover, we show that the same finite-scale analysis reconciles experimental measurements of three-body binding energies with the universal theory.
- 出版日期2014-7-2
