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Physical Review Letters

Published on January 5, 2017

Combining scanning tunneling microscopy (STM) and density functional theory, we unambiguously identify Cu intercalated on the octahedral site in the van der Waals gap of 1T-CuxTiSe2. STM imaging shows that at low Cu content (x<2%) the CDW tends to form stripes while at higher contents (x>5%) it forms short-range ordered domains which tend to be phase shifted. Tunneling spectroscopy shows a well developed gap below the Fermi level associated with the CDW. We find Cu to behave as a band dopant, where the chemical potential is increasing with increasing Cu content and electron states are contributed to the Fermi level.

Collaboration with UCL/LCN.

Phys. Rev. Lett.118, 017002 (2017)