Doping Tunable CDW Phase Transition in Bulk 1T-ZrSe₂.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• Tunable electronic properties of transition metal dichalcogenides (TMDs) are crucial for advanced device applications.
• Semiconducting bulk 1T-ZrSe2 exhibits potential for electronic applications, but understanding its doping effects is key.
• Charge density waves (CDWs) are important phenomena in low-dimensional materials, influencing their electronic behavior.

Purpose of the Study:

• To investigate the impact of atomic impurities on the electronic properties of semiconducting bulk 1T-ZrSe2.
• To explore the relationship between Fermi level shifts and the emergence of charge density waves (CDWs).
• To provide local insights into electron-doping-mediated CDW transitions in TMDs.

Main Methods:

• Comprehensive scanning tunneling microscopy (STM) was employed to visualize atomic structures.
• Scanning tunneling spectroscopy (STS) was utilized to probe local electronic properties.
• Analysis focused on the electronic behavior of 1T-ZrSe2 in the presence of atomic impurities.

Main Results:

• Atomic impurities were found to locally shift the Fermi level (Ef) into the conduction band of 1T-ZrSe2.
• This Fermi level shift concurrently triggered a charge density wave (CDW) reconstruction.
• A notable consequence was the opening of an electronic gap at the Fermi level (Ef).

Conclusions:

• The study confirms that atomic impurities can induce CDW formation in semiconducting 1T-ZrSe2.
• Findings provide local, atomic-scale understanding of electron-doping effects on CDW transitions in TMDs.
• This research offers new perspectives on earlier photoemission spectroscopy and theoretical studies of 1T-ZrSe2.