Answer to Question #153036 in Field Theory for Afraid

Question

What singma y and sigma z matrix

Answer 1

In mathematical physics and mathematics, the Pauli matrices are a set of three 2 × 2 complex matrices which are Hermitian and unitary. Usually indicated by the Greek letter sigma σ:

$$\sigma_y=\begin{pmatrix} 0 & -i \\ i & 0 \end{pmatrix}\\ \sigma_z=\begin{pmatrix} 1 &0 \\ 0 & -1 \end{pmatrix}$$