• P Hemagiri Rao

      Articles written in Pramana – Journal of Physics

    • Piezoelectricity in quasicrystals: A group-theoretical study

      K Rama Rao P Hemagiri Rao B S K Chaitanya

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      Group-theoretical methods have been accepted as exact and reliable tools in studying the physical properties of crystals and quasicrystalline materials. By group representation theory, the maximum number of non-vanishing and independent second- order piezoelectric coefficients required by the seven pentagonal and two icosahedral point groups - that describe the quasicrystal symmetry groups in two and three dimensions - is determined. The schemes of non-vanishing and independent second-order piezoelectric tensor components needed by the nine point groups with five-fold rotations are identified and tabulated employing a compact notation. The results of this group-theoretical study are briefly discussed.

    • Allowable irreducible representations of the point groups with five-fold rotational axes

      K Ram Mohana Rao B Simhachalam P Hemagiri Rao

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      Allowable irreducible representations of the point groups with five-fold rotations – that represent the symmetry of the quasicrystals in two and three dimensions – are derived by employing the little group technique in conjunction with the solvability property. The point groups $D_{5h}(\bar{10}m2)$ and $I_{h}(\dfrac{2}{m} \bar{3} \bar{5})$ are taken to illustrate the method.

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