Abstract:
We develop a FORTRAN code to compute fluctuations in atomic condensates (FACt) by solving the
Bogoliubov–de Gennes (BdG) equations for two component Bose–Einstein condensate (TBEC) in quasitwo
dimensions. The BdG equations are recast as matrix equations and solved self consistently. The
code is suitable for handling quantum fluctuations as well as thermal fluctuations at temperatures
below the critical point of Bose–Einstein condensation. The code is versatile, and the ground state
density profile and low energy excitation modes obtained from the code can be easily adapted
to compute different properties of TBECs — ground state energy, overlap integral, quasi particle
amplitudes of BdG spectrum, dispersion relation and structure factor and other related experimental
observables.
