'Can we destroy a quasi-particle?  (annihilate hole or annihilate particle)
If so, would that be above or below the fermi surface?
>>> from sympy import Symbol
>>> from sympy.physics.secondquant import F
>>> a = Symbol(\'a\', above_fermi=1)
>>> i = Symbol(\'i\', below_fermi=1)
>>> p = Symbol(\'p\')
>>> F(a).is_q_annihilator
1
>>> F(i).is_q_annihilator
0
>>> F(p).is_q_annihilator
1'

@property
def is_q_annihilator(self):

    if self.is_above_fermi:
        return 1
    return 0
