Incoherence-to-coherence crossover observed in charge-density-wave material 1T-TiSe₂.

ABSTRACT: Analogous to the condensation of Cooper pairs in superconductors, the Bose-Einstein condensation (BEC) of electron-hole pairs in semiconductors and semimetals leads to an emergence of an exotic ground state - the excitonic insulator state. In this paper, we study the electronic structure of 1T-TiSe₂ utilizing angle-resolved photoemission spectroscopy and alkali-metal deposition. Alkali-metal adatoms are deposited in-situ on the sample surface, doping the system with electrons. The conduction bands of 1T-TiSe₂ are thereby pushed down below the Fermi energy, which enables us to characterize its temperature dependence with precision. We found that the formation of the charge density wave (CDW) in 1T-TiSe₂ at ~ 205 K is accompanied by a significant increase of

SUBMITTER: Ou Y 

PROVIDER: S-EPMC11502827 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature