Revealing the Charge Density Wave Caused by Peierls Instability in Two-Dimensional NbSe2
學年 112
學期 2
出版（發表）日期 2024-06-11
作品名稱 Revealing the Charge Density Wave Caused by Peierls Instability in Two-Dimensional NbSe2
作品名稱（其他語言）
著者 Hsueh, Hung-chung
單位
出版者
著錄名稱、卷期、頁數 ACS Materials Letters 6(7),　p.2941-2947
摘要 The formation of a charge density wave (CDW) in 2D materials caused by Peierls instability is a controversial topic. This study investigates the extensively debated role of Fermi surface nesting in causing the CDW state in 2H-NbSe2 materials. Four NbSe2 structures are identified on the basis of the characteristics in scanning tunneling microscopy images and first-principles simulations. The calculations reveal that an energetically favored filled phase corresponds to Peierls’ description with fully opened gaps at the CDW Brillouin zone boundary, resulting in a drop at the Fermi level in the density of states and scanning tunneling spectroscopy spectra. The electronic susceptibility and phonon instability indicate that the Fermi surface nesting is triggered by two nesting vectors, whereas the involvement of only one nesting vector leads to a so-called stripe phase. This comprehensive study demonstrates that the filled phase of NbSe2 can be categorized as a Peierls instability-induced CDW in two-dimensional systems.
關鍵字
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Hung-Chung Hsueh (薛宏中), Chun-Liang Lin, Chi-Cheng Lee, and Ming-Chiang Chung
審稿制度 否
國別 TWN
公開徵稿
出版型式 ,電子版,紙本
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