Abstract
Two-body dissipation usually gives rise to a complex interaction. Here we study the effect of two-body dissipation on few-body physics, including the fundamental two-body effective scattering and the three-body Efimov physics. By employing a two-channel model that incorporates the decay of closed-channel molecules (generating the two-body dissipation), we explicitly relate the real and imaginary part of the inverse scattering length (${a}_{s}^{\ensuremath{-}1}$) to closed-channel detuning and decay rate. In particular, we show that the imaginary part of ${a}_{s}^{\ensuremath{-}1}$ is given by the product of the molecule decay rate and the effective range. Such complex scattering length is found to generate an additional imaginary Coulomb potential when three atoms come close to each other, thereby suppressing the formation of trimer bound states and modifying the conventional discrete scaling in Efimov physics.
Highlights
Dissipation is ubiquitous in nature, while its origin can be associated with different decay processes
SUMMARY AND DISCUSSION In this work, we have studied the effective scattering and Efimov physics with a complex interaction that is induced by two-body dissipation
By employing a two-channel model including the decay of closed-channel molecule, we have shown that the real and imaginary parts of 1/as can be independently tuned by the detuning and decay rate of closed channel molecules
Summary
Dissipation is ubiquitous in nature, while its origin can be associated with different decay processes. The two-body dissipation describes a typical class of decay process where two particles are simultaneously lost from the system due to their pairwise interaction Such dissipation is usually modeled by a complex interaction. In the three-body sector, the complex scattering length generates an additional imaginary Coulomb potential when three particles come close to each other. Such potential is found to suppress the formation of trimer bound states and lead to a generalized discrete scaling law for Efimov physics. We have demonstrated these effects using both the Born-Oppenheimer approximation and the hyperspherical coordinate approach.
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