I'm a physicist doing a course on condensates, superfluidity and superconductivity and I'm confused as to how these states overlap. Are all BECs necessarily superfluid? Are all superfluids necessarily BECs? The literature is incredibly ambiguous
It is widely accepted that microcavity polaritons also undergo Bose-Einstein condensation and form a 2D BEC. However this is quite an unusual BEC as it can only have limited spatial size and is always in a state of nonequilibrium.In 2D or 1D, it is not possible have an ordered state such as a BEC; but nevertheless, it is possible to have superfluidic properties.