Pitaevskii BEC Center, CNR-INO and Dipartimento di Fisica, Universitá di Trento, Trento I38123, Italy and INFN-TIFPA, Trento Institute for Fundamental Physics and Applications, Trento 38123, Italy
*Contact author: andrea.legramandi@unitn.it
†Present address: School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India.