Thus, the electron is free to move along the 2 direction but is constrained along x and y directions. The wire subband structure is obtained by the variational method using the trial wavefunction fo(x, y)

= No exp [k2 (x + y)] x< - L y<- L cos(k1x)cos(k1y) - Lx < x< Lx -L < y < L

22 Ly

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