Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00083 : Germanene structure enhancement by adjacent insoluble domains of lead
Presenter:
Ting-Yu Chen
(National Tsing Hua University, Hsinchu, Taiwan)
Authors:
Ting-Yu Chen
(National Tsing Hua University, Hsinchu, Taiwan)
Shu-Jung Tang
(National Tsing Hua University, Hsinchu, Taiwan)
David Mikolas
(National Tsing Hua University, Hsinchu, Taiwan)
Woei Wu Pai
(National Taiwan University, Taipei, Taiwan)
Germanene has been successfully grown on Ag(111) in two phases: the striped ph ase (SP) and the quasi-freestanding phase (QP). We report the discovery of an interesting recipe for enhancement of epitaxially grown monatomic layers on a lattice-mismatched substrate using chemical pressure between an insoluble monatomic layer and an existing Xene, in our case monatomic Pb layer and QP germanene on Ag(111). Using low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM), we demonstrate that the 2D monatomic Pb layer, instead of being on top, grows side-by-side with QP germanene, not only driving the SP-to-QP transition but further enhancing the lattice order of QP as revealed by the dramatic evolution of LEED-spot shape and uniform STM-imaged array of moiré patterns. The higher-order coincidence (HOC) density analysis for both monatomic layers on Ag(111) shows that the further rotation of both converts them to more favorable configurations that also produce improved lattice order and more intrinsic electronic structures.
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