Electromechanics to probe nanoscale charge density wave transition

Materials which support charge density waves exhibit a number of interesting properties. We have probed the charge density wave phase transition at nanoscale. This was done by fabricating nanoelectromechanical resonators from flakes (thickness < 50 nm) of NbSe2. The change of elastic modulus at the critical temperature showed markedly different behaviour from what is known for bulk crystals. We have also studied aspects of electron transport and the coexistence of charge density wave with superconductivity.


 

 

 

 

Change in elastic constant across the CDW transition reflects in the change in the resonance frequency.