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

Research output: Contribution to journalArticlepeer-review


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 (<TCDW) 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 languageEnglish
Article number122422
JournalSurface Science
Publication statusPublished - Mar 2024


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


Dive into the research topics of 'Comparison of tunneling spectra for normal and charge density wave states in 1T-TiSe2'. Together they form a unique fingerprint.

Cite this