other,and the irreducible Brillouin zone unexpectedly retracted back to the 1/8 of the first Brillouin zone though the symmetry of elements is lower than that of the square lattice.Meanwhile,the first bandgap width of the perpendicular array can be adjusted by the rotation of each primit...
The first Brillouin zone in an energy E versus momentum k plot is limited to π/a (a is the lattice constant) in the principal axes of a primitive cubic lattice. In the diamond lattice cell (eight atoms per cell) the Brillouin zone edge is given by 2π/a. By applying a superlattice...
At the fundamental level, though many theoretical models were constructed on the basis of the so-called 1-Fe Brillouin zone (BZ) with an emphasis of the basic square lattice of iron atoms, most electronic structure measurements were interpreted in the 2-Fe BZ. Whether the 1-Fe BZ is valid...
How do you define the source for a periodic structure. The plane waves are out of phase with neighboring unit cells when the k-vector is not zero. How do you get past this problem? hi you have explained calculation of dispersion very nice but if there s triangular lattice which unit cell...
To create a Brillouin map of the cornea, 20–40 axial scans are taken at different locations laterally across the cornea, usually within the central ∅6 mm zone. Light power was calibrated to be 5 mW on the corneal surface. Each axial scan comprises 40 points separated by a step ...
This kind of MCs is composed of two different atoms in the unit cell, and the symmetry of the unit cell is broken due to changes in the position of the second atom, so the irreducible part of the BZ is no longer the small area (Gamma XM) for square lattice, and it must be ...
The analysis was applied to a two-dimensional square-lattice photonic crystal with C4v symmetry and the dispersion relation in the vicinity of the M point was examined. Exact agreement between the analytical and numerical calculation was obtained....
modes of the square lattice of C4v symmetry and the combination of A1g and T1u modes of the simple cubic lattice of Oh symmetry create isotropic Dirac cones [3], while the combination of E1 and E2 modes of the triangular lattice of C6v symmetry leads to isotropic double Dirac cones [4...
Our data suggest that the interlayer separation is an important tuning factor for the physics of FeAs layers, the increase of which can reduce the coupling between Fe and As and lead to the emergence of the electronic structure in accord with the one-Fe symmetry of the Fe square lattice. ...
The square of the Fermi diameter (2k_F)~2, electrons per atom ratio e/a and the critical reciprocal lattice vector |G|~2 are determined. A shallow pseudogap at the Fermi level was interpreted as originating from interference of electrons having (2k_F)~2 = 109.2 卤 1.0 with sets of ...