- #1
LagrangeEuler
- 717
- 20
For example if we look Ising model correlation function is
[tex]\langle S_iS_{i+j}\rangle[/tex]
So we can see that if we took into acount just nearest neighbours interraction we also will see that some [tex]i+j[/tex]-th spin feels i-th spin. So there is some correlation between them.
Am I right? This is correlation function. And what is correlation lenght?
Is it length between
[itex]\uparrow\uparrow\uparrow\uparrow\downarrow\downarrow[/itex]
the biggest number of align spins?
[tex]\langle S_iS_{i+j}\rangle[/tex]
So we can see that if we took into acount just nearest neighbours interraction we also will see that some [tex]i+j[/tex]-th spin feels i-th spin. So there is some correlation between them.
Am I right? This is correlation function. And what is correlation lenght?
Is it length between
[itex]\uparrow\uparrow\uparrow\uparrow\downarrow\downarrow[/itex]
the biggest number of align spins?