Homework Statement
The occupation of each single-particle state with wave vector k =/= 0 in the ground state is given by nk = <0|bk†bk|0>
where b and b† are bogoliubov transformaition. Find an expression for nk.
bk = cosh(θ)ak - sinh(θ) a†-k
bk† = cosh(θ)a†k - sinh(θ)a-k
Homework EquationsThe...