be a
Fock state, composed of single-particle states drawn from a
basis of the underlying Hilbert space of the Fock space. Given the corresponding
creation and annihilation operators and we define the number operator by
and we have
where is the number of particles in state . The above equality can be proven by noting that
Bruus, Henrik; Flensberg, Karsten (2004). Many-body Quantum Theory in Condensed Matter Physics: An Introduction. Oxford University Press.
ISBN0-19-856633-6.
be a
Fock state, composed of single-particle states drawn from a
basis of the underlying Hilbert space of the Fock space. Given the corresponding
creation and annihilation operators and we define the number operator by
and we have
where is the number of particles in state . The above equality can be proven by noting that
Bruus, Henrik; Flensberg, Karsten (2004). Many-body Quantum Theory in Condensed Matter Physics: An Introduction. Oxford University Press.
ISBN0-19-856633-6.