title: Charge density waves in exfoliated films of van der Waals materials: evolution of Raman spectrum in TiSe2.
abstract: A number of the charge-density-wave materials reveal a transition to the macroscopic quantum state around 200 K. We used graphene-like mechanical exfoliation of TiSe(2) crystals to prepare a set of films with different thicknesses. The transition temperature to the charge-density-wave state was determined via modification of Raman spectra of TiSe(2) films. It was established that the transition temperature can increase from its bulk value to ~240 K as the thickness of the van der Waals films reduces to the nanometer range. The obtained results are important for the proposed applications of such materials in the collective-state information processing, which require room-temperature operation.
authors.affiliation: Department of Electrical Engineering and Materials Science and Engineering Program, Bourns College of Engineering, University of California-Riverside, Riverside, California 92521, USA.
authors.forename: Pradyumna
authors.initials: P
authors.lastname: Goli
authors.forename: Javed
authors.initials: J
authors.lastname: Khan
authors.forename: Darshana
authors.initials: D
authors.lastname: Wickramaratne
authors.forename: Roger K
authors.initials: RK
authors.lastname: Lake
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Balandin