Observation of the nesting and defect-driven 1D incommensurate charge density waves phase in the 2D system

A V Matetskiy; N V Denisov; C R Hsing; C M Wei; A V Zotov; A A Saranin

doi:10.1088/1361-648X/aaf9ea

Observation of the nesting and defect-driven 1D incommensurate charge density waves phase in the 2D system

J Phys Condens Matter. 2019 Mar 20;31(11):115402. doi: 10.1088/1361-648X/aaf9ea. Epub 2018 Dec 19.

Authors

A V Matetskiy¹, N V Denisov, C R Hsing, C M Wei, A V Zotov, A A Saranin

Affiliation

¹ Institute of Automation and Control Processes FEB RAS, 5 Radio Street, 690041 Vladivostok, Russia.

PMID: 30566916
DOI: 10.1088/1361-648X/aaf9ea

Abstract

We report on the low-temperature scanning tunneling microscopy/spectroscopy (STM/STS) study of the (Bi, Na)/Si(1 1 1)[Formula: see text] reconstruction that is known to possess Fermi surface with apparently good nesting. We found that defects on this surface produce a one-dimensional-like pattern with the periodicity of 8.2 [Formula: see text] 0.4 [Formula: see text] that is incommensurate with the [Formula: see text] lattice period. The [Formula: see text] mapping analysis reveals an occurrence of the k-dependent branch associated with quasi-particle interference and the k-independent branch associated with the nesting vector connecting the parallel segments of the (Bi,Na)/Si(1 1 1)[Formula: see text] Fermi surface, the fingerprint of the charge-density-wave (CDW) phase. The STS data demonstrates that development of the CDW phase leads to reducing electron density of states at the Fermi level.