Shift of semimetal-semiconductor bond direction on "0 1 1" to "1 1 1" Bismuth quazi-two- dimension system

AbstractThe electronic structure of the nanocrystallines and quasi-two-dimensional systems strongly impressed by the thermodynamic-behavior mainly due to excess of hidden surface free- energy. Therefore, the stability of... [ view full abstract ]

Abstract

The electronic structure of the nanocrystallines and quasi-two-dimensional systems strongly impressed by the thermodynamic-behavior mainly due to excess of hidden surface free- energy. Therefore, the stability of crystalline structure’s change could be related to band-offset of bond rupturing of atomic displacements. Although “Be” has been found to be one of the metallic surface states characterized by semimetal character, its atomic-orbitals are closed and its diboride composition BeB₂ is surprisingly emerged as a superconductor with too much low-value of T_c=0.7. The character of topological insulator Bi which is more expressed and quickly oxidizing could be an intriguing question. Besides all of the characters behave spatial like strong sensitive oxidation and electronic structure in the absence of Oxygen. This effect on the electronic-structure of "Bi" is supposed to be the cause of strong-correlated electron system emerging on the competition of super-double exchange with strong spin-orbit coupling resulted to the bond-exchange on direction of redistribution of surface chemical bond formation before any reconstructive structure. Where

• The metallic direction of electronic structure “0 1 1” is changed to “1 1 1” semiconductor direction(fig1). Where the effect of L.S is not observable around the fermi surface (fig1.b). This effect is more evident on the local density of state. The effect could be consequence of sliding deformation which is the cause of privation in formation mechanism of quasi-two dimension in “0 1 1” direction resulted to bond rupturing atomic displacement of semi metallic character of “1 1 1.
• Strong effect of spin-orbit interaction on splitting of the valance to nearly conduction band (fig2). The effect of the L.S is strongly evident around the fermi surface (fig2.b).

Which could be a question whether the Bychkov-rashba SOI in the conduction band resulted from the electric field in the valence band or the dynamical Landau-ginzburg-broken symmetry could be the cause, which is the main goal of this article.