Quasicondensation and off-diagonal long-range order of hard-core bosons
during a free expansion
Quasicondensation and off-diagonal long-range order of hard-core bosons
during a free expansion
Quasicondensation in one dimension is known to occur for equilibrium systems of hard-core bosons (HCBs) at zero temperature. This phenomenon arises due to the off-diagonal long-range order in the ground state, characterized by a power-law decay of the one-particle density matrix $g_1(x,y)\sim |x-y|^{-1/2}$~--~a well-known outcome of Luttinger liquid theory. Remarkably, …