Comparison of tunneling spectra for normal and charge density wave states in 1T-TiSe2

Atsushi Nomura; Tohru Kurosawa; Migaku Oda; Satoshi Demura; Shogo Kuwahara; Sora Kobayashi; Hideaki Sakata

doi:10.1016/j.susc.2023.122422

Comparison of tunneling spectra for normal and charge density wave states in 1T-TiSe₂

Atsushi Nomura, Tohru Kurosawa, Migaku Oda, Satoshi Demura, Shogo Kuwahara, Sora Kobayashi, Hideaki Sakata

College of Science and Technology

Research output: Contribution to journal › Article › peer-review

Abstract

The tunneling spectrum of 1T-TiSe₂ in the charge density wave (CDW) state shows a dip structure below the Fermi level, and it is unclear whether this dip is a CDW gap. Answering this question is important because information regarding the CDW gap estimated from the dip is referred in discussions of the driving mechanism of this CDW. Therefore, we used scanning tunneling microscopy/scanning tunneling spectroscopy to acquire tunneling spectra for the normal and CDW states in TiSe₂ and compared the spectra. Specifically, we measured pure TiSe₂ at 293 K (>T_CDW) and 4.2 K (<T_CDW) and annealed TiSe₂, in which the CDW is suppressed. As a result, we found that the tunneling spectra for the normal states exhibit a dip below the Fermi level similar to the spectrum for the CDW state. These results indicate that the dip itself is not a CDW gap.

Original language	English
Article number	122422
Journal	Surface Science
Volume	741
DOIs	https://doi.org/10.1016/j.susc.2023.122422
Publication status	Published - Mar 2024

Keywords

Charge density wave
Energy gap
Scanning tunneling microscopy/scanning tunneling spectroscopy
Transition-metal dichalcogenide

Access to Document

10.1016/j.susc.2023.122422

Cite this

@article{7c5f993e0a854b6e8e904479832f3ab1,

title = "Comparison of tunneling spectra for normal and charge density wave states in 1T-TiSe2",

abstract = "The tunneling spectrum of 1T-TiSe2 in the charge density wave (CDW) state shows a dip structure below the Fermi level, and it is unclear whether this dip is a CDW gap. Answering this question is important because information regarding the CDW gap estimated from the dip is referred in discussions of the driving mechanism of this CDW. Therefore, we used scanning tunneling microscopy/scanning tunneling spectroscopy to acquire tunneling spectra for the normal and CDW states in TiSe2 and compared the spectra. Specifically, we measured pure TiSe2 at 293 K (>TCDW) and 4.2 K (CDW) and annealed TiSe2, in which the CDW is suppressed. As a result, we found that the tunneling spectra for the normal states exhibit a dip below the Fermi level similar to the spectrum for the CDW state. These results indicate that the dip itself is not a CDW gap.",

keywords = "Charge density wave, Energy gap, Scanning tunneling microscopy/scanning tunneling spectroscopy, Transition-metal dichalcogenide",

author = "Atsushi Nomura and Tohru Kurosawa and Migaku Oda and Satoshi Demura and Shogo Kuwahara and Sora Kobayashi and Hideaki Sakata",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2024",

month = mar,

doi = "10.1016/j.susc.2023.122422",

language = "English",

volume = "741",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Comparison of tunneling spectra for normal and charge density wave states in 1T-TiSe2

AU - Nomura, Atsushi

AU - Kurosawa, Tohru

AU - Oda, Migaku

AU - Demura, Satoshi

AU - Kuwahara, Shogo

AU - Kobayashi, Sora

AU - Sakata, Hideaki

PY - 2024/3

Y1 - 2024/3

N2 - The tunneling spectrum of 1T-TiSe2 in the charge density wave (CDW) state shows a dip structure below the Fermi level, and it is unclear whether this dip is a CDW gap. Answering this question is important because information regarding the CDW gap estimated from the dip is referred in discussions of the driving mechanism of this CDW. Therefore, we used scanning tunneling microscopy/scanning tunneling spectroscopy to acquire tunneling spectra for the normal and CDW states in TiSe2 and compared the spectra. Specifically, we measured pure TiSe2 at 293 K (>TCDW) and 4.2 K (CDW) and annealed TiSe2, in which the CDW is suppressed. As a result, we found that the tunneling spectra for the normal states exhibit a dip below the Fermi level similar to the spectrum for the CDW state. These results indicate that the dip itself is not a CDW gap.

AB - The tunneling spectrum of 1T-TiSe2 in the charge density wave (CDW) state shows a dip structure below the Fermi level, and it is unclear whether this dip is a CDW gap. Answering this question is important because information regarding the CDW gap estimated from the dip is referred in discussions of the driving mechanism of this CDW. Therefore, we used scanning tunneling microscopy/scanning tunneling spectroscopy to acquire tunneling spectra for the normal and CDW states in TiSe2 and compared the spectra. Specifically, we measured pure TiSe2 at 293 K (>TCDW) and 4.2 K (CDW) and annealed TiSe2, in which the CDW is suppressed. As a result, we found that the tunneling spectra for the normal states exhibit a dip below the Fermi level similar to the spectrum for the CDW state. These results indicate that the dip itself is not a CDW gap.

KW - Charge density wave

KW - Energy gap

KW - Scanning tunneling microscopy/scanning tunneling spectroscopy

KW - Transition-metal dichalcogenide

UR - http://www.scopus.com/inward/record.url?scp=85178472395&partnerID=8YFLogxK

U2 - 10.1016/j.susc.2023.122422

DO - 10.1016/j.susc.2023.122422

M3 - Article

AN - SCOPUS:85178472395

SN - 0039-6028

VL - 741

JO - Surface Science

JF - Surface Science

M1 - 122422

ER -

Comparison of tunneling spectra for normal and charge density wave states in 1T-TiSe₂

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this