Initialize a Majorana operator.

term(tuple or string): The first element of the tuple indicates the mode on which the Majorana operator acts, starting from zero. The second element of the tuple is an integer, either 0 or 1, indicating which type of Majorana operator it is:

Type 0: :math:a^\dagger_p + a_p

Type 1: :math:i (a^\dagger_p - a_p)

where the :math:a^\dagger_p and :math:a_p are the usual fermionic ladder operators. Alternatively, one can provide a string such as 'c2', which is a Type 0 operator on mode 2, or 'd3', which is a Type 1 operator on mode 3. Default will result in the zero operator. coefficient(complex or float, optional): The coefficient of the term. Default value is 1.0.