Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 107: Semiconductor Surfaces (joint session O/HL)

O 107.9: Talk

Thursday, March 19, 2020, 17:15–17:30, REC C 213

Novel electronic junctions in an atomic wire array: metallic states, charge density waves and solitonic excitations — •Abdus Samad Razzaq¹, Sun Kyu Song², Han Woong Yeom², and Stefan Wippermann¹ — ¹Max-Planck-Institut für Eisenforschung, Germany — ²Pohang University, South Korea

The Si(111)-(4x1)In atomic wire array is an extremely popular model for one-dimensional (1D) electronic systems. It features a reversible, temperature-induced metal insulator transition into a charge density wave (CDW) ordered ground state with (8x2) translational symmetry. Close to the phase transition temperature, both phases can coexist and form novel types of electronic junctions between the metallic (4x1) phase and the insulating CDW-ordered (8x2) phase. Furthermore, the CDW phase is 4-fold degenerate, giving rise to solitonic excitations of the CDW, that take the form of phase boundaries between different CDW ground states. Combining scanning tunnelling microscopy (STM) and ab initio molecular dynamics (AIMD) calculations, we explore the microscopic structures of interfaces between distinct electronic phases at the atomic scale. These models enable insights into soliton propagation and soliton-mediated charge transport. Financial support from the German Research Foundation (DFG), grant no. FOR1700, and BMBF NanoMatFutur, grant no. 13N12972, is gratefully acknowledged.