Charge Density Waves in Exfoliated Thin Films of Van der Waals Materials
  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 titanium diselenide 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 titanium diselenide 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. 
Pradyumna Goli, Javed Khan, Darshana Wickramaratne, Roger K. Lake and   Alexander A. Balandin
cond-mat.mes-hall cond-mat.mtrl-sci