Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.237602
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Funding
- NSF [DMR-0537588]
- DFG [546 TCP 10, MA 2371/3]
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Even though the semimetallic behavior of 1T-TiSe(2) seemed to be well established by band structure calculations and photoemission results, this conclusion has been challenged recently. Two high-resolution photoemission investigations deduced semiconducting behavior, however with a very small band gap. Such conclusion from photoemission is afflicted, in principle, by the problem of determining an unoccupied conduction band by photoemission. This problem is solved here by the idea of H(2)O adsorption onto the van der Waals-like surface, causing a distinct bending of the bands and resulting in a filled lowest conduction band. The detailed analysis yields undoubtedly semiconducting behavior for 1T-TiSe(2) and interesting properties of a semiconductor with extremely small band gap.
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