Controlled growth of Gd-Pt surface alloys on Pt(111)

Przychodnia, Marta; Hermanowicz, Michał; Sierda, Emil; Elsebach, Micha; Grzela, T.; Wiesendanger, R.; Bazarnik, Maciej

doi:10.1103/physrevb.105.035416

Cited by 2 publications

(1 citation statement)

References 56 publications

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“…The mirror reflection symmetry with respect to the xy plane (M z ), an essential factor for the existence of the DNL, is preserved. Atomic arrangement of Ge and Au atoms is similar to Au 2 Gd, , Pt 2 Gd, Ag 2 Gd, and Cu 2 Si . Electron localization function (ELF) [see Figure S1a in the Supporting Information (SI)] reveals that electrons are distributed as a sea around Au atoms while localized around Ge atoms.…”

Section: Resultsmentioning

confidence: 99%

Twist-Angle Tuning of Electronic Structure in Two-Dimensional Dirac Nodal Line Semimetal Au₂Ge on Au(111)

Tian,

Bagheri Tagani,

Izadi Vishkayi

et al. 2024

ACS Nano

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Topological semimetals have emerged as quantum materials including Dirac, Weyl, and nodal line semimetals, and so on. Dirac nodal line (DNL) semimetals possess topologically nontrivial bands crossing along a line or a loop and are considered precursor states for other types of semimetals. Here, we combine scanning tunneling microscopy/spectroscopy (STM/S) measurements and density functional theory (DFT) calculations to investigate a twist angle tuning of electronic structure in two-dimensional DNL semimetal Au 2 Ge. Theoretical calculations show that two bands of Au 2 Ge touch each other in Γ-M and Γ-K paths, forming a DNL. A significant transition of electronic structure occurs by tuning the twist angle from 30°to 24°between monolayer Au 2 Ge and Au(111), as confirmed by STS measurements and DFT calculations. The disappearing of DNL state is a direct consequence of symmetry breaking.

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