Finite temperature off-diagonal long-range order for interacting bosons

摘要

Characterizing the scaling with the total particle number (N) of the largest eigenvalue of the one-body density matrix (λ_0) provides information on the occurrence of the off-diagonal long-range order (ODLRO) according to the Penrose-Onsager criterion. Setting λ_0 ～ N~(C_0), then C_0 = 1 corresponds in ODLRO. The intermediate case, 0