A team led by Prof. He Junfeng from University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS), together with domestic and international collaborators, discovered that the energy level of the van Hove singularity (VHS) in the novel Ti-based kagome metal CsTi3Bi5 can be tuned without lattice structural instability. Their work was published in Physical Review Letters on July 12 as the cover article.
. First-principles calculations and low-temperature X-ray diffraction measurements showed no lattice instability in CsTiResearchers went on to find that electrons can be introduced by Cs surface doping, enabling the modulation of the VHS in CsTiin a wide energy range. When the VHS approaches Fermi level, it can generate electronic instabilities. At the same time, first-principles calculations showed no lattice structural instability in CsTiafter electron doping.
The researchers also found that even if the VHS is tuned to introduce electronic instability near the Fermi energy level, it still can't generate the energy gap in CDW in CsTi
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