- #1

- 9

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Hi, i would ask you an opinion about a (maybe stupid) doubt.

Let us think of a 1D lattice whose sites distant from each other "a"; a plane wave

in the lattice is given by [itex]e^{ikja}[/itex] where k is the momentum and j an

integer label for each site. Now, we modify the lattice in this way: between sites j

and j+1 we put a distance that is a+c (instead of a). Then, what is the effect of this

alteration on the plane wave? It is right to say that the only effect is a shift in the

phase of the wave before and after the sites j,j+1?

Let us think of a 1D lattice whose sites distant from each other "a"; a plane wave

in the lattice is given by [itex]e^{ikja}[/itex] where k is the momentum and j an

integer label for each site. Now, we modify the lattice in this way: between sites j

and j+1 we put a distance that is a+c (instead of a). Then, what is the effect of this

alteration on the plane wave? It is right to say that the only effect is a shift in the

phase of the wave before and after the sites j,j+1?