First exact model for “Negative Absolute Temperature” (<0⁰K).

In a recently published paper in June, 2020, the research group led by Prof. Utpal Roy, Department of Physics, Indian Institute of Technology Patna, Bihar, has invented an exact method to produce Negative Absolute Temperature in a system of Ultracold-atoms or Bose-Einstein condensate (BEC). They have published their work in a reputed International journal, ‘Scientific Reports’, of Springer Nature publication (A. Nath, J. Bera, S. Ghosh and U. Roy, Sci. Rep 10, 9016 (2020). https://doi.org/10.1038/s41598-020-65765-9).