Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 9: Semiconductor Substrates I: Adsorption of Small Molecules, Metallic Nanowires, Overlayers
O 9.5: Vortrag
Montag, 18. März 2024, 11:30–11:45, MA 144
Realizing strictly one dimensional behavior in arrays of atomic wires on semiconducting substrate emerging from dispersive two dimensional system — Keshab Sony and •Anas Abdelwahab — Leibniz Universität Hannover, Hanover, Germany
We studied single and two Su-Shreiffer-Heeger wires on simple cubic semiconducting substrate. The wire-wire coupling is either perpendicular or diagonal hopping respecting the particle-hole and time-reversal symmetries. The hybridization to substrate renormalizes the model parameters of the wires towards the hopping parameter of the substrate without changing the basic nature of perpendicular or diagonal coupling and it can mediate effective perpendicular hopping but not diagonal hopping in the absence of direct wire-wire coupling. This justifies the investigation of multi uniform tight binding wires with perpendicular or diagonal hopping parameters while neglecting the substrate. Perpendicularly coupled uniform wires reveal anisotropic two dimensional band dispersion. Diagonally coupled uniform wires reveal strictly one dimensional bands parallel to the wires direction if the intra-wire hopping parameter is larger than twice the diagonal hopping parameter despite strong dispersion perpendicular to the wires. Otherwise, they reveal strictly one dimensional bands parallel and perpendicular to the wires direction simultaneously. We established the possibility of realizing strictly one dimensional properties emerging from dispersive two dimensional system if time-reversal and particle-hole symmetries are respected. This can facilitate the debate on one dimensional behavior of the Au/Ge(001) surface reconstruction.
Keywords: 1D properties emerging from dispersive 2D system; Au/Ge(001) surface reconstruction; Modeling atomic wires on semiconducting substrates