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We carry out first-principle calculations on monolayer group IV–VI 2D materials. We study systems consisting of group IV (C, Si, Ge) and group VI elements (O, S, Se, Te) and find that all the materials form buckled puckered geometries. We clarify that VI atoms tend to be located at the lower positions in the buckled structure when the electronegativity of the VI atom is sufficiently larger than that of the IV atom, which is due to the electron transfer from the IV atom to the VI atom. All the calculated bands are doubly degenerated on the first Brillouin zone edge and this degeneracy can be explained based on the group theory.

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Abstract. Recently, much attention has been directed to calculational prediction for binding free energy and structural analysis for biomolecule complex in solvate state. We investigated Influenza Hemagglutinin (wild type HA), mutated HA and its neutralize antibody Fab fragment complex in explicit solvent water molecules by molecular dynamics simulation(MD). B-factor and binding free energy of loop structures in the complex structure are calculated. The calculation result supports the experimental result in a qualitative tendency. MD calculation also shows that hydrogen bond distance differs between wild type HA and mutated HA, which contributes to the difference of binding free energy and structural stability. These result suggests that pattern of making hydrogen bonds in crystal structure are almost kept even in solvate state.