I have the following unitary monoidal spherical category C:
Simple objects: $\{1,x,y\}$.
Non-trivial Fusion Rules:
$$x\otimes y=x=y\otimes x$$ $$x\otimes x=1 \oplus 2x \oplus y$$
I would like to find the Drinfeld centre for this category. I am aware that the Drinfeld centre has elements of the form $(x,e_x)$ where $x\in C$ and $e_x=\{e_x(y)\in Hom(xy,yx),y\in C\}$ has to satisfy
(i) $f\otimes id_x o e_x(y)=e_x(z) o id_x \otimes f \forall f:y\rightarrow z$
(ii) $e_x(y\otimes z)=id_y\otimes e_z(z) o e_X(y) \otimes id_z \forall y,z \in C$
(iii) $e_x(1)=id_x$
I am trying to find explicit expressions for the maps $e_x(y)$.
One can consider a basis $(v^{yx}_{x_k})_io(v^{x_k}_{xy})_j$ where $x_k=1,x,y$ and $1\leq i,j \leq dim(Hom(xy,x_k))$ for the spaces Hom(xy,yx).
For example: $e_y(y)= \alpha (v^{yy}_1 o v^1_{yy})$ where $\alpha$ is some constant which we have to determine using the conditions above. If we use the first condition and choose z=1 then we get,
$$f \otimes id_y o e_y(y)=id_y \otimes f$$ where $f:y\rightarrow 1$. I am not sure how to proceed from here. Is this information enough to determine $\alpha$? I think I am missing something here and any help would be appreciated.
Edit: Since the category is spherical, one could maybe make use of the traces and quantum dimensions of the simple objects. But, I am not sure how to proceed.