Details

Autor(en) / Beteiligte

• Zong, Junyu
• Xie, Yang
• Meng, Qinghao
• Tian, Qichao
• Chen, Wang
• Xie, Xuedong
• Jin, Shaoen
• Zhang, Yongheng
• Wang, Li
• Ren, Wei
• Shen, Jian
• Chen, Aixi
• Wang, Pengdong
• Li, Fang-Sen
• Dong, Zhaoyang
• Wang, Can
• Li, Jian-Xin
• Zhang, Yi

Titel

Observation of multiple charge density wave phases in epitaxial monolayer 1T-VSe2 film

Ist Teil von

• Chinese physics B, 2022-09, Vol.31 (10), p.153-161

Ort / Verlag

Chinese Physical Society and IOP Publishing Ltd

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• As a special order of electronic correlation induced by spatial modulation,the charge density wave(CDW)phenomena in condensed matters attract enormous research interests.Here,using scanning-tunneling microscopy in various tempera-tures,we discover a hidden incommensurate stripe-like CDW order besides the(√7×√3)CDW phase at low-temperature of 4 K in the epitaxial monolayer 1T-VSe2 film.Combining the variable-temperature angle-resolved photoemission spec-troscopic(ARPES)measurements,we discover a two-step transition of an anisotropic CDW gap structure that consists of two parts △1 and △2.The gap part △1 that closes around～150 K is accompanied with the vanish of the(√7×√3)CDW phase.While another momentum-dependent gap part △2 can survive up to～340 K,and is suggested to the result of the incommensurate CDW phase.This two-step transition with anisotropic gap opening and the resulted evolution in ARPES spectra are corroborated by our theoretical calculation based on a phenomenological form for the self-energy containing a two-gap structure △1+△2,which suggests different forming mechanisms between the(√7×√3)and the incommensurate CDW phases.Our findings provide significant information and deep understandings on the CDW phases in monolayer 1T-VSe2 film as a two-dimensional(2D)material.