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a. The phase diagram on the complex a −1 c plane for BECs subjected to weak interaction and two-body loss. The system is unstable for θ ≡ arg(a −1 c ) > 5π 6
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Contact interaction is a fundamental concept that appears in various areas of physics. It simplifies physical models by replacing the detailed short-range interaction with a zero-range contact potential which reproduces the same low-energy scattering parameter, i.e. the $s$-wave scattering length. In this work, we generalize this concept to a syste...
